Delete duplicate copy of class

## Summary
This causes inconsistency in the API and should be addressed. The
primary consumer of the API is NEI preview and the preview does show
wrong block with glass tier set, not sure if this is the cause
<img width="1088" height="491" alt="image"
src="https://github.com/user-attachments/assets/fff146d8-6d8e-44d9-842e-1677691271d2"
/>

## Checklist
- [ ] I have tested this PR in DevEnv
- [ ] I have tested this PR in Fullpack
- [x] This PR is in compliance with the [GTNH AI
Policy](https://github.com/GTNewHorizons/GTNH-Dev-Doc/blob/master/AI_POLICY.md)
- [ ] This PR requires another PR in order to merge

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.editorconfig

@@ -0,0 +1,19 @@
+# This is the universal Text Editor Configuration
+# for all GTNewHorizons projects
+# See: https://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{bat,ini}]
+end_of_line = crlf
+
+[*.{dtd,json,info,mcmeta,md,sh,svg,xml,xsd,xsl,yaml,yml}]
+indent_size = 2

.git-blame-ignore-revs

@@ -0,0 +1,2 @@
+# Ignore spotlessApply reformat
+464e44de8541a46833f50c3bd363d50e1677a685

.gitattributes

@@ -1,22 +1,44 @@
-# Auto detect text files and perform LF normalization
+* text eol=lf
-* text=auto
 
-# Custom for Visual Studio
+*.[jJ][aA][rR]          binary
-*.cs     diff=csharp
-*.sln    merge=union
-*.csproj merge=union
-*.vbproj merge=union
-*.fsproj merge=union
-*.dbproj merge=union
 
-# Standard to msysgit
+*.[pP][nN][gG]          binary
-*.doc	 diff=astextplain
+*.[jJ][pP][gG]          binary
-*.DOC	 diff=astextplain
+*.[jJ][pP][eE][gG]      binary
-*.docx diff=astextplain
+*.[gG][iI][fF]          binary
-*.DOCX diff=astextplain
+*.[tT][iI][fF]          binary
-*.dot  diff=astextplain
+*.[tT][iI][fF][fF]      binary
-*.DOT  diff=astextplain
+*.[iI][cC][oO]          binary
-*.pdf  diff=astextplain
+*.[sS][vV][gG]          text
-*.PDF	 diff=astextplain
+*.[eE][pP][sS]          binary
-*.rtf	 diff=astextplain
+*.[xX][cC][fF]          binary
-*.RTF	 diff=astextplain
+
+*.[kK][aA][rR]          binary
+*.[mM]4[aA]             binary
+*.[mM][iI][dD]          binary
+*.[mM][iI][dD][iI]      binary
+*.[mM][pP]3             binary
+*.[oO][gG][gG]          binary
+*.[rR][aA]              binary
+
+*.7[zZ]                 binary
+*.[gG][zZ]              binary
+*.[tT][aA][rR]          binary
+*.[tT][gG][zZ]          binary
+*.[zZ][iI][pP]          binary
+
+*.[tT][cC][nN]          binary
+*.[sS][oO]              binary
+*.[dD][lL][lL]          binary
+*.[dD][yY][lL][iI][bB]  binary
+*.[pP][sS][dD]          binary
+*.[tT][tT][fF]          binary
+*.[oO][tT][fF]          binary
+
+*.[pP][aA][tT][cC][hH]  -text
+
+*.[bB][aA][tT]          text eol=crlf
+*.[cC][mM][dD]          text eol=crlf
+*.[pP][sS]1             text eol=crlf
+
+*[aA][uU][tT][oO][gG][eE][nN][eE][rR][aA][tT][eE][dD]* binary

.github/scripts/test-no-crash-reports.sh

@@ -1,9 +0,0 @@
-directory="run/crash-reports"
-if [ -d $directory ]; then
-  echo "Crash reports detected:"
-  cat $directory/*
-  exit 1
-else
-  echo "No crash reports detected"
-  exit 0
-fi

.github/scripts/test_no_error_reports

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+# bashsupport disable=BP5006 # Global environment variables
+RUNDIR="run" \
+  CRASH="crash-reports" \
+  SERVERLOG="server.log"
+
+# enable nullglob to get 0 results when no match rather than the pattern
+shopt -s nullglob
+
+# store matches in array
+crash_reports=("$RUNDIR/$CRASH/crash"*.txt)
+
+# if array not empty there are crash_reports
+if [ "${#crash_reports[@]}" -gt 0 ]; then
+  # get the latest crash_report from array
+  latest_crash_report="${crash_reports[-1]}"
+  {
+    printf 'Latest crash report detected %s:\n' "${latest_crash_report##*/}"
+    cat "$latest_crash_report"
+  } >&2
+  exit 1
+fi
+
+if grep --quiet --fixed-strings 'Fatal errors were detected' "$SERVERLOG"; then
+  {
+    printf 'Fatal errors detected:\n'
+    cat server.log
+  } >&2
+  exit 1
+fi
+
+if grep --quiet --fixed-strings 'The state engine was in incorrect state ERRORED and forced into state SERVER_STOPPED' \
+  "$SERVERLOG"; then
+  {
+    printf 'Server force stopped:'
+    cat server.log
+  } >&2
+  exit 1
+fi
+
+if ! grep --quiet --perl-regexp --only-matching '.+Done \(.+\)\! For help, type "help" or "\?"' "$SERVERLOG"; then
+  {
+    printf 'Server did not finish startup:'
+    cat server.log
+  } >&2
+  exit 1
+fi
+
+printf 'No crash reports detected'
+exit 0

.github/workflows/build-and-test.yml

@@ -1,5 +1,3 @@
-# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
 
 name: Build and test
 
@@ -11,35 +9,5 @@ on:
 
 jobs:
   build-and-test:
-    runs-on: ubuntu-latest
+    uses: GTNewHorizons/GTNH-Actions-Workflows/.github/workflows/build-and-test.yml@master
-    steps:
+    secrets: inherit
-    - uses: actions/checkout@v2
-      with: 
-        fetch-depth: 0
-    
-    - name: Set up JDK 8
-      uses: actions/setup-java@v2
-      with:
-        java-version: '8'
-        distribution: 'adopt'
-        cache: gradle
-        
-    - name: Grant execute permission for gradlew
-      run: chmod +x gradlew
-
-    - name: Setup the workspace
-      run: ./gradlew setupCIWorkspace
-    
-    - name: Build the mod
-      run: ./gradlew build
-
-    - name: Run server for 1 minute
-      run: |
-        mkdir run
-        echo "eula=true" > run/eula.txt  
-        timeout 10 ./gradlew runServer || true
-
-    - name: Test no crashes happend
-      run: |
-        chmod +x .github/scripts/test-no-crash-reports.sh
-        .github/scripts/test-no-crash-reports.sh

.github/workflows/optimize-images.yml

@@ -0,0 +1,17 @@
+name: Optimize images
+
+on:
+  pull_request:
+    branches: [ master, main, release/** ]
+    paths:
+      - "**/*.png"
+
+  push:
+    branches: [ master, main, release/** ]
+    paths:
+      - "**/*.png"
+
+jobs:
+  optimize-images:
+    uses: GTNewHorizons/GTNH-Actions-Workflows/.github/workflows/optimize-images.yml@master
+    secrets: inherit

.github/workflows/publish-javadoc.yaml

@@ -0,0 +1,98 @@
+name: Deploy Javadoc
+
+on:
+  push:
+    branches:
+      - master
+      - feature/doc
+      - '**/*-javadoc'
+    tags:
+      - '*'
+  delete:
+
+permissions:
+  contents: write
+  pages: write
+  id-token: write
+
+jobs:
+  prune:
+    if: github.event_name == 'delete'
+    concurrency: javadoc-publish
+    runs-on: ubuntu-latest
+    outputs:
+      result_hash: ${{ steps.deploy.outputs.hash }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: gh-pages
+
+      - name: Deploy 🚀
+        id: deploy
+        shell: bash
+        run: |
+          if git rm -r $TARGET_FOLDER ; then
+            echo Nothing to clean up
+          fi
+
+          find . -name javadoc -type d -print | sed 's#^\./\(.*\)/javadoc$#\1#' | sort --version-sort --reverse > index.txt
+          git add index.txt
+          git config user.name "${GITHUB_ACTOR}"
+          git config user.email "${GITHUB_ACTOR_ID}-${GITHUB_ACTOR}@users.noreply.github.com"
+          git commit -m "Clean up javadoc after ref $TARGET_FOLDER is deleted"
+          git push
+          echo "hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+        env:
+          TARGET_FOLDER: ${{ github.ref_name }}
+
+  javadoc:
+    if: github.event_name == 'push'
+    concurrency: javadoc-publish
+    runs-on: ubuntu-latest
+    outputs:
+      result_hash: ${{ steps.deploy.outputs.hash }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-java@v3
+        with:
+          java-version: |
+            8
+            11
+            17
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Generate Javadoc
+        run: ./gradlew --no-daemon spotlessCheck javadoc
+
+      - name: Deploy 🚀
+        id: deploy
+        shell: bash
+        run: |
+          mv build/docs $RUNNER_TEMP/docs_output
+          rm build -rf
+          git checkout gh-pages
+          mkdir -p $TARGET_FOLDER
+          rm -rf $TARGET_FOLDER
+          mv $RUNNER_TEMP/docs_output $TARGET_FOLDER -v
+          git add $TARGET_FOLDER
+          if git diff --cached --exit-code > /dev/null ; then
+            echo Nothing to deploy
+            exit 0
+          fi
+          find . -name javadoc -type d -print | sed 's#^\./\(.*\)/javadoc$#\1#' | sort --version-sort --reverse > index.txt
+          git add index.txt
+          git config user.name "${GITHUB_ACTOR}"
+          git config user.email "${GITHUB_ACTOR_ID}-${GITHUB_ACTOR}@users.noreply.github.com"
+          git commit -m "Deploy javadoc from ref $TARGET_FOLDER"
+          git push
+          echo "hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+        env:
+          TARGET_FOLDER: ${{ github.ref_name }}

.github/workflows/release-latest.yml

@@ -1,44 +0,0 @@
-# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
-
-name: Release latest build
-
-on:
-  push:
-    branches: [ master, main ]
-
-jobs:
-  build-and-release:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-
-      - name: Set release version
-        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-
-      - name: Set up JDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: '8'
-          distribution: 'adopt'
-          cache: gradle
-
-      - name: Grant execute permission for gradlew
-        run: chmod +x gradlew
-
-      - name: Setup the workspace
-        run: ./gradlew setupCIWorkspace
-
-      - name: Build the mod
-        run: ./gradlew build
-
-      - name: Update latest tag
-        uses: "marvinpinto/action-automatic-releases@latest"
-        with:
-          repo_token: "${{ secrets.GITHUB_TOKEN }}"
-          automatic_release_tag: "latest"
-          prerelease: false
-          title: "Latest build"
-          files: build/libs/*.jar

.github/workflows/release-tags.yml

@@ -1,45 +1,14 @@
-# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
 
 name: Release tagged build
 
 on:
   push:
-    tags:
+    tags: [ '*' ]
-      - '*'
+
+permissions:
+  contents: write
 
 jobs:
-  build:
+  release-tags:
-    runs-on: ubuntu-latest
+    uses: GTNewHorizons/GTNH-Actions-Workflows/.github/workflows/release-tags.yml@master
-    steps:
+    secrets: inherit
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-
-      - name: Set release version
-        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-
-      - name: Set up JDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: '8'
-          distribution: 'adopt'
-          cache: gradle
-
-      - name: Grant execute permission for gradlew
-        run: chmod +x gradlew
-
-      - name: Setup the workspace
-        run: ./gradlew setupCIWorkspace
-
-      - name: Build the mod
-        run: ./gradlew build
-
-      - name: Release under current tag
-        uses: "marvinpinto/action-automatic-releases@latest"
-        with:
-          repo_token: "${{ secrets.GITHUB_TOKEN }}"
-          automatic_release_tag: "${{ env.RELEASE_VERSION }}"
-          prerelease: false
-          title: "${{ env.RELEASE_VERSION }}"
-          files: build/libs/*.jar

.gitignore

@@ -26,3 +26,5 @@ whitelist.json
 *.ipr
 *.iws
 src/main/resources/mixins.*.json
+*.bat
+layout.json

CODEOWNERS

@@ -0,0 +1,3 @@
+# Any Github changes require admin approval
+/.github/** @GTNewHorizons/admin
+

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
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+  Finally, every program is threatened constantly by software patents.
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
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+  "The Program" refers to any copyrightable work licensed under this
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+"recipients" may be individuals or organizations.
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+  A "covered work" means either the unmodified Program or a work based
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+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
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+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
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+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
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+  You may convey verbatim copies of the Program's source code as you
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+    a) The work must carry prominent notices stating that you modified
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+    b) The work must carry prominent notices stating that it is
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+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
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+    work need not make them do so.
+
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+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
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+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
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+  6. Conveying Non-Source Forms.
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+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
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+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE.LESSER

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
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+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
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+
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+
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+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
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+version:
+
+   a) under this License, provided that you make a good faith effort to
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+   function or data, the facility still operates, and performs
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+
+   b) under the GNU GPL, with none of the additional permissions of
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+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
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+   Library is used in it and that the Library and its use are
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+
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+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
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+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
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+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
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+   Information in the manner specified by section 6 of the GNU GPL
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+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
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+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
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+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

README.md

@@ -21,9 +21,16 @@ Originally created by TecTech authors, taken with permission. It's under MIT lic
     }
     ```
    Replace `master-SNAPSHOT` with a commit hash or a tag name (if any) of your choice to prevent unexpected upstream changes.
-2. Add `required-after:structurelib;` to your `@Mod(dependencies = "..")` tring. 
+2. Add `required-after:structurelib;` to your `@Mod(dependencies = "..")` tring.
 3. Add `structurelib` to your `mcmod.info`.
 
 ## Contribution
 
 The project is developed using IDEA. Please manually configure the build to not delegate to gradle for textures to show up in dev.
+
+## Current license
+Due to me adding in ItemStackMap, which was derived from code from CodeChicken's LGPL mod NEI. This mod is effectively considered
+licensed under LGPL in its entirety since commit ebef584b8c518f8202cfe0984fb28a6d23e52b3d or any squash commit containing it, e.g.
+609e50428ee4e293f65f67f554a70b9fcfae97c4.
+
+Note while the LICENSE.txt is added by a much later commit, all code on previous commits are covered by this as well.

addon.gradle

@@ -0,0 +1,41 @@
+javadoc {
+    javadocTool = javaToolchains.javadocToolFor {
+        // Last version with frames, but it also has search
+        languageVersion = JavaLanguageVersion.of(25)
+        vendor = JvmVendorSpec.ADOPTIUM
+    }
+
+    inputs.file  "src/main/javadoc/overview.html"
+
+    include "com/gtnewhorizon/structurelib/alignment/**"
+    include "com/gtnewhorizon/structurelib/constructable/**"
+    include "com/gtnewhorizon/structurelib/structure/**"
+    include "com/gtnewhorizon/structurelib/util/**"
+    include "com/gtnewhorizon/structurelib/StructureLibAPI.java"
+    include "com/gtnewhorizon/structurelib/StructureEvent.java"
+
+    classpath += sourceSets.patchedMc.output
+
+    options {
+        overview "src/main/javadoc/overview.html"
+        links 'https://docs.oracle.com/en/java/javase/25/docs/api/'
+        links 'https://skmedix.github.io/ForgeJavaDocs/javadoc/forge/1.7.10-10.13.4.1614/'
+    }
+}
+
+tasks.register('javadocJar', Jar) {
+    dependsOn javadoc
+    archiveClassifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
+artifacts {
+    archives javadocJar
+}
+
+test {
+    useJUnitPlatform()
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+}

build.gradle

@@ -1,521 +1,5 @@
-//version: 4f3d1b46cf51f9d4ded5379b5d817a2a6f6b302d
+//version: 1707058017
-/*
-DO NOT CHANGE THIS FILE!
-
-Also, you may replace this file at any time if there is an update available.
-Please check https://github.com/SinTh0r4s/ExampleMod1.7.10/blob/main/build.gradle for updates.
- */
-
-
-import com.github.jengelman.gradle.plugins.shadow.tasks.ConfigureShadowRelocation
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
-
-import java.util.concurrent.TimeUnit
-
-buildscript {
-    repositories {
-        maven {
-            name = "forge"
-            url = "https://maven.minecraftforge.net"
-        }
-        maven {
-            name = "sonatype"
-            url = "https://oss.sonatype.org/content/repositories/snapshots/"
-        }
-        maven {
-            name = "Scala CI dependencies"
-            url = "https://repo1.maven.org/maven2/"
-        }
-        maven {
-            name = "jitpack"
-            url = "https://jitpack.io"
-        }
-    }
-    dependencies {
-        classpath 'com.github.GTNewHorizons:ForgeGradle:1.2.4'
-    }
-}
 
 plugins {
-    id 'idea'
+    id 'com.gtnewhorizons.gtnhconvention'
-    id 'scala'
-    id("org.ajoberstar.grgit") version("3.1.1")
-    id("com.github.johnrengelman.shadow") version("4.0.4")
-    id("com.palantir.git-version") version("0.12.3")
-}
-
-apply plugin: 'forge'
-
-def projectJavaVersion = JavaLanguageVersion.of(8)
-
-java {
-    toolchain {
-        languageVersion.set(projectJavaVersion)
-    }
-}
-
-idea {
-    module {
-        inheritOutputDirs = true
-        downloadJavadoc = true
-        downloadSources = true
-    }
-}
-
-checkPropertyExists("modName")
-checkPropertyExists("modId")
-checkPropertyExists("modGroup")
-checkPropertyExists("autoUpdateBuildScript")
-checkPropertyExists("minecraftVersion")
-checkPropertyExists("forgeVersion")
-checkPropertyExists("replaceGradleTokenInFile")
-checkPropertyExists("gradleTokenModId")
-checkPropertyExists("gradleTokenModName")
-checkPropertyExists("gradleTokenVersion")
-checkPropertyExists("gradleTokenGroupName")
-checkPropertyExists("apiPackage")
-checkPropertyExists("accessTransformersFile")
-checkPropertyExists("usesMixins")
-checkPropertyExists("mixinPlugin")
-checkPropertyExists("mixinsPackage")
-checkPropertyExists("coreModClass")
-checkPropertyExists("containsMixinsAndOrCoreModOnly")
-checkPropertyExists("usesShadowedDependencies")
-checkPropertyExists("developmentEnvironmentUserName")
-
-def checkPropertyExists(String propertyName) {
-    if (project.hasProperty(propertyName) == false) {
-        throw new GradleException("This project requires a property \"" + propertyName + "\"! Please add it your \"gradle.properties\". You can find all properties and their description here: https://github.com/SinTh0r4s/ExampleMod1.7.10/blob/main/gradle.properties")
-    }
-}
-
-
-String javaSourceDir = "src/main/java/"
-String scalaSourceDir = "src/main/scala/"
-
-String targetPackageJava = javaSourceDir + modGroup.toString().replaceAll("\\.", "/")
-String targetPackageScala = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/")
-if((new File(targetPackageJava).exists() || new File(targetPackageScala).exists()) == false) {
-    throw new GradleException("Could not resolve \"modGroup\"! Could not find " + targetPackageJava + " or " + targetPackageScala)
-}
-
-if(apiPackage) {
-    targetPackageJava = javaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + apiPackage.toString().replaceAll("\\.", "/")
-    targetPackageScala = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + apiPackage.toString().replaceAll("\\.", "/")
-    if((new File(targetPackageJava).exists() || new File(targetPackageScala).exists()) == false) {
-        throw new GradleException("Could not resolve \"apiPackage\"! Could not find " + targetPackageJava + " or " + targetPackageScala)
-    }
-}
-
-if(accessTransformersFile) {
-    String targetFile = "src/main/resources/META-INF/" + accessTransformersFile
-    if(new File(targetFile).exists() == false) {
-        throw new GradleException("Could not resolve \"accessTransformersFile\"! Could not find " + targetFile)
-    }
-}
-
-if(usesMixins.toBoolean()) {
-    if(mixinsPackage.isEmpty() || mixinPlugin.isEmpty()) {
-        throw new GradleException("\"mixinPlugin\" requires \"mixinsPackage\" and \"mixinPlugin\" to be set!")
-    }
-
-    targetPackageJava = javaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + mixinsPackage.toString().replaceAll("\\.", "/")
-    targetPackageScala = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + mixinsPackage.toString().replaceAll("\\.", "/")
-    if((new File(targetPackageJava).exists() || new File(targetPackageScala).exists()) == false) {
-        throw new GradleException("Could not resolve \"mixinsPackage\"! Could not find " + targetPackageJava + " or " + targetPackageScala)
-    }
-
-    String targetFileJava = javaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + mixinPlugin.toString().replaceAll("\\.", "/") + ".java"
-    String targetFileScala = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + mixinPlugin.toString().replaceAll("\\.", "/") + ".scala"
-    String targetFileScalaJava = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + mixinPlugin.toString().replaceAll("\\.", "/") + ".java"
-    if((new File(targetFileJava).exists() || new File(targetFileScala).exists() || new File(targetFileScalaJava).exists()) == false) {
-        throw new GradleException("Could not resolve \"mixinPlugin\"! Could not find " + targetFileJava + " or " + targetFileScala + " or " + targetFileScalaJava)
-    }
-}
-
-if(coreModClass) {
-    String targetFileJava = javaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + coreModClass.toString().replaceAll("\\.", "/") + ".java"
-    String targetFileScala = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + coreModClass.toString().replaceAll("\\.", "/") + ".scala"
-    String targetFileScalaJava = scalaSourceDir + modGroup.toString().replaceAll("\\.", "/") + "/" + coreModClass.toString().replaceAll("\\.", "/") + ".java"
-    if((new File(targetFileJava).exists() || new File(targetFileScala).exists() || new File(targetFileScalaJava).exists()) == false) {
-        throw new GradleException("Could not resolve \"coreModClass\"! Could not find " + targetFileJava + " or " + targetFileScala + " or " + targetFileScalaJava)
-    }
-}
-
-configurations.all {
-    resolutionStrategy.cacheChangingModulesFor(0, TimeUnit.SECONDS)
-
-    // Make sure GregTech build won't time out
-    System.setProperty("org.gradle.internal.http.connectionTimeout", 120000 as String)
-    System.setProperty("org.gradle.internal.http.socketTimeout", 120000 as String)
-}
-
-// Fix Jenkins' Git: chmod a file should not be detected as a change and append a '.dirty' to the version
-'git config core.fileMode false'.execute()
-// Pulls version from git tag
-version = minecraftVersion + "-" + gitVersion()
-group = modGroup
-archivesBaseName = modId
-
-minecraft {
-    version = minecraftVersion + "-" + forgeVersion + "-" + minecraftVersion
-    runDir = "run"
-
-    if (replaceGradleTokenInFile) {
-        replaceIn replaceGradleTokenInFile
-        if(gradleTokenModId) {
-            replace gradleTokenModId, modId
-        }
-        if(gradleTokenModName) {
-            replace gradleTokenModName, modName
-        }
-        if(gradleTokenVersion) {
-            replace gradleTokenVersion, versionDetails().lastTag
-        }
-        if(gradleTokenGroupName) {
-            replace gradleTokenGroupName, modGroup
-        }
-    }
-}
-
-if(file("addon.gradle").exists()) {
-    apply from: "addon.gradle"
-}
-
-apply from: 'repositories.gradle'
-
-configurations {
-    implementation.extendsFrom(shadowImplementation)
-}
-
-repositories {
-    maven {
-        name = "Overmind forge repo mirror"
-        url = "https://gregtech.overminddl1.com/"
-    }
-    if(usesMixins.toBoolean()) {
-        maven {
-            name = "sponge"
-            url = "https://repo.spongepowered.org/repository/maven-public"
-        }
-        maven {
-            url = "https://jitpack.io"
-        }
-    }
-}
-
-dependencies {
-    if(usesMixins.toBoolean()) {
-        annotationProcessor("org.ow2.asm:asm-debug-all:5.0.3")
-        annotationProcessor("com.google.guava:guava:24.1.1-jre")
-        annotationProcessor("com.google.code.gson:gson:2.8.6")
-        annotationProcessor("org.spongepowered:mixin:0.8-SNAPSHOT")
-        // using 0.8 to workaround a issue in 0.7 which fails mixin application
-        compile("org.spongepowered:mixin:0.7.11-SNAPSHOT") {
-            // Mixin includes a lot of dependencies that are too up-to-date
-            exclude module: "launchwrapper"
-            exclude module: "guava"
-            exclude module: "gson"
-            exclude module: "commons-io"
-            exclude module: "log4j-core"
-        }
-        compile("com.github.GTNewHorizons:SpongeMixins:1.3.3:dev")
-    }
-}
-
-apply from: 'dependencies.gradle'
-
-def mixinConfigJson = "mixins." + modId + ".json"
-def mixingConfigRefMap = "mixins." + modId + ".refmap.json"
-def refMap = "${tasks.compileJava.temporaryDir}" + File.separator + mixingConfigRefMap
-def mixinSrg = "${tasks.reobf.temporaryDir}" + File.separator + "mixins.srg"
-
-task generateAssets {
-    if(usesMixins.toBoolean()) {
-        new File(projectDir.toString() + "/src/main/resources/", mixinConfigJson).text = """{
-  "required": true,
-  "minVersion": "0.7.11",
-  "package": "${modGroup}.${mixinsPackage}",
-  "plugin": "${modGroup}.${mixinPlugin}",
-  "refmap": "${mixingConfigRefMap}",
-  "target": "@env(DEFAULT)",
-  "compatibilityLevel": "JAVA_8"
-}
-
-"""
-    }
-}
-
-task relocateShadowJar(type: ConfigureShadowRelocation) {
-    target = tasks.shadowJar
-    prefix = modGroup + ".shadow"
-}
-
-shadowJar {
-    manifest {
-        attributes(getManifestAttributes())
-    }
-
-    minimize()  // This will only allow shading for actually used classes
-    configurations = [project.configurations.shadowImplementation]
-    dependsOn(relocateShadowJar)
-}
-
-jar {
-    manifest {
-        attributes(getManifestAttributes())
-    }
-
-    if(usesShadowedDependencies.toBoolean()) {
-        dependsOn(shadowJar)
-        enabled = false
-    }
-}
-
-reobf {
-    if(usesMixins.toBoolean()) {
-        addExtraSrgFile mixinSrg
-    }
-}
-
-afterEvaluate {
-    if(usesMixins.toBoolean()) {
-        tasks.compileJava {
-            options.compilerArgs += [
-                    "-AreobfSrgFile=${tasks.reobf.srg}",
-                    "-AoutSrgFile=${mixinSrg}",
-                    "-AoutRefMapFile=${refMap}",
-                    // Elan: from what I understand they are just some linter configs so you get some warning on how to properly code
-                    "-XDenableSunApiLintControl",
-                    "-XDignore.symbol.file"
-            ]
-        }
-    }
-}
-
-runClient {
-    def arguments = []
-
-    if(usesMixins.toBoolean()) {
-        arguments += [
-                "--mods=../build/libs/$modId-${version}.jar",
-                "--tweakClass org.spongepowered.asm.launch.MixinTweaker"
-        ]
-    }
-
-    if(developmentEnvironmentUserName) {
-        arguments += [
-                "--username",
-                developmentEnvironmentUserName
-        ]
-    }
-
-    args(arguments)
-}
-
-runServer {
-    def arguments = []
-
-    if (usesMixins.toBoolean()) {
-        arguments += [
-                "--mods=../build/libs/$modId-${version}.jar",
-                "--tweakClass org.spongepowered.asm.launch.MixinTweaker"
-        ]
-    }
-
-    args(arguments)
-}
-
-tasks.withType(JavaExec).configureEach {
-    javaLauncher.set(
-            javaToolchains.launcherFor {
-                languageVersion = projectJavaVersion
-            }
-    )
-}
-
-processResources
-        {
-            // this will ensure that this task is redone when the versions change.
-            inputs.property "version", project.version
-            inputs.property "mcversion", project.minecraft.version
-
-            // replace stuff in mcmod.info, nothing else
-            from(sourceSets.main.resources.srcDirs) {
-                include 'mcmod.info'
-
-                // replace version and mcversion
-                expand "minecraftVersion": project.minecraft.version,
-                        "modVersion": versionDetails().lastTag,
-                        "modId": modId,
-                        "modName": modName
-            }
-
-            // copy everything else, thats not the mcmod.info
-            from(sourceSets.main.resources.srcDirs) {
-                exclude 'mcmod.info'
-            }
-        }
-
-def getManifestAttributes() {
-    def manifestAttributes = [:]
-    if(containsMixinsAndOrCoreModOnly.toBoolean() == false && (usesMixins.toBoolean() || coreModClass)) {
-        manifestAttributes += ["FMLCorePluginContainsFMLMod": true]
-    }
-
-    if(accessTransformersFile) {
-        manifestAttributes += ["FMLAT" : accessTransformersFile.toString()]
-    }
-
-    if(coreModClass) {
-        manifestAttributes += ["FMLCorePlugin": modGroup + "." + coreModClass]
-    }
-
-    if(usesMixins.toBoolean()) {
-        manifestAttributes += [
-                "TweakClass" : "org.spongepowered.asm.launch.MixinTweaker",
-                "MixinConfigs" : mixinConfigJson,
-                "ForceLoadAsMod" : containsMixinsAndOrCoreModOnly.toBoolean() == false
-        ]
-    }
-    return manifestAttributes
-}
-
-task sourcesJar(type: Jar) {
-    from (sourceSets.main.allJava)
-    from (file("$projectDir/LICENSE"))
-    getArchiveClassifier().set('sources')
-}
-
-task shadowDevJar(type: ShadowJar) {
-    from sourceSets.main.output
-    getArchiveClassifier().set("dev")
-
-    manifest {
-        attributes(getManifestAttributes())
-    }
-
-    minimize()  // This will only allow shading for actually used classes
-    configurations = [project.configurations.shadowImplementation]
-}
-
-task relocateShadowDevJar(type: ConfigureShadowRelocation) {
-    target = tasks.shadowDevJar
-    prefix = modGroup + ".shadow"
-}
-
-task circularResolverJar(type: Jar) {
-    dependsOn(relocateShadowDevJar)
-    dependsOn(shadowDevJar)
-    enabled = false
-}
-
-task devJar(type: Jar) {
-    from sourceSets.main.output
-    getArchiveClassifier().set("dev")
-
-    manifest {
-        attributes(getManifestAttributes())
-    }
-
-    if(usesShadowedDependencies.toBoolean()) {
-        dependsOn(circularResolverJar)
-        enabled = false
-    }
-}
-
-task apiJar(type: Jar) {
-    from (sourceSets.main.allJava) {
-        include modGroup.toString().replaceAll("\\.", "/") + "/" + apiPackage.toString() + '/**'
-    }
-
-    from (sourceSets.main.output) {
-        include modGroup.toString().replaceAll("\\.", "/") + "/" + apiPackage.toString() + '/**'
-    }
-
-    from (sourceSets.main.resources.srcDirs) {
-        include("LICENSE")
-    }
-
-    getArchiveClassifier().set('api')
-}
-
-artifacts {
-    archives sourcesJar
-    archives devJar
-    if(apiPackage) {
-        archives apiJar
-    }
-}
-
-// Crude handler to append custom maven repositories to maven dependency
-install{
-    repositories{
-        mavenInstaller{
-            pom.withXml {
-                def repositoriesNode = asNode().appendNode("repositories")
-                project.repositories.each { repository ->
-                    def repositoryNode = repositoriesNode.appendNode("repository")
-                    repositoryNode.appendNode("name", repository.name)
-                    repositoryNode.appendNode("url", repository.properties.get("url"))
-                }
-            }
-        }
-    }
-}
-
-// Updating
-task updateBuildScript {
-    doLast {
-        if (updateBuildScript()) return
-
-        print("Build script already up-to-date!")
-    }
-}
-
-if (isNewBuildScriptVersionAvailable()) {
-    if (autoUpdateBuildScript.toBoolean()) {
-        updateBuildScript()
-    } else {
-        println("Build script update available! Run 'gradle updateBuildScript'")
-    }
-}
-
-static URL availableBuildScriptUrl() {
-    new URL("https://raw.githubusercontent.com/SinTh0r4s/ExampleMod1.7.10/main/build.gradle")
-}
-
-static boolean updateBuildScript() {
-    if (isNewBuildScriptVersionAvailable()) {
-        def buildscriptFile = new File("build.gradle")
-        availableBuildScriptUrl().withInputStream { i -> buildscriptFile.withOutputStream { it << i } }
-        print("Build script updated. Please REIMPORT the project or RESTART your IDE!")
-        return true
-    }
-    return false
-}
-
-static boolean isNewBuildScriptVersionAvailable() {
-    Map parameters = ["connectTimeout": 2000, "readTimeout": 2000]
-
-    String currentBuildScript = new File("build.gradle").getText()
-    String currentBuildScriptHash = getVersionHash(currentBuildScript)
-    String availableBuildScript = availableBuildScriptUrl().newInputStream(parameters).getText()
-    String availableBuildScriptHash = getVersionHash(availableBuildScript)
-
-    boolean isUpToDate = currentBuildScriptHash.empty || availableBuildScriptHash.empty || currentBuildScriptHash == availableBuildScriptHash
-    return !isUpToDate
-}
-
-static String getVersionHash(String buildScriptContent) {
-    String versionLine = buildScriptContent.find("^//version: [a-z0-9]*")
-    if(versionLine != null) {
-        return versionLine.split(": ").last()
-    }
-    return ""
-}
-
-configure(updateBuildScript) {
-    group = 'forgegradle'
-    description = 'Updates the build script to the latest version'
 }

dependencies.gradle

@@ -1,5 +1,10 @@
 // Add your dependencies here
 
 dependencies {
+    api("com.github.GTNewHorizons:GTNHLib:0.11.21:dev")
+    implementation("com.github.GTNewHorizons:NotEnoughItems:2.8.110-GTNH:dev")
 
+    testImplementation(platform('org.junit:junit-bom:5.9.2'))
+    testImplementation('org.junit.jupiter:junit-jupiter')
+	testRuntimeOnly ('org.junit.platform:junit-platform-launcher')
 }

gradle.properties

@@ -1,60 +1,238 @@
+# ExampleMod tag to use as Blowdryer (Spotless, etc.) settings version, leave empty to disable.
+# LOCAL to test local config updates.
+gtnh.settings.blowdryerTag = 0.2.0
+
+# Human-readable mod name, available for mcmod.info population.
 modName = StructureLib
 
-# This is a case-sensitive string to identify your mod. Convention is to use lower case.
+# Case-sensitive identifier string, available for mcmod.info population and used for automatic mixin JSON generation.
+# Conventionally lowercase.
 modId = structurelib
 
+# Root package of the mod, used to find various classes in other properties,
+# mcmod.info substitution, enabling assertions in run tasks, etc.
 modGroup = com.gtnewhorizon.structurelib
 
-# WHY is there no version field?
+# Whether to use modGroup as the maven publishing group.
-# The build script relies on git to provide a version via tags. It is super easy and will enable you to always know the
+# When false, com.github.GTNewHorizons is used.
-# code base or your binary. Check out this tutorial: https://blog.mattclemente.com/2017/10/13/versioning-with-git-tags/
+useModGroupForPublishing = false
 
-# Will update your build.gradle automatically whenever an update is available
+# Updates your build.gradle and settings.gradle automatically whenever an update is available.
 autoUpdateBuildScript = false
 
+# Version of Minecraft to target
 minecraftVersion = 1.7.10
+
+# Version of Minecraft Forge to target
 forgeVersion = 10.13.4.1614
 
-# Select a username for testing your mod with breakpoints. You may leave this empty for a random user name each time you
+# Specify an MCP channel for dependency deobfuscation and the deobfParams task.
-# restart Minecraft in development. Choose this dependent on your mod:
+channel = stable
-# Do you need consistent player progressing (for example Thaumcraft)? -> Select a name
-# Do you need to test how your custom blocks interacts with a player that is not the owner? -> leave name empty
-developmentEnvironmentUserName = "Developer"
 
-# Define a source file of your project with:
+# Specify an MCP mappings version for dependency deobfuscation and the deobfParams task.
-# public static final String VERSION = "GRADLETOKEN_VERSION";
+mappingsVersion = 12
-# The string's content will be replaced with your mods version when compiled. You should use this to specify your mod's
+
-# version in @Mod([...], version = VERSION, [...])
+# Defines other MCP mappings for dependency deobfuscation.
-# Leave these properties empty to skip individual token replacements
+remoteMappings = https\://raw.githubusercontent.com/MinecraftForge/FML/1.7.10/conf/
-replaceGradleTokenInFile = StructureLib.java
+
+# Select a default username for testing your mod. You can always override this per-run by running
+# `./gradlew runClient --username=AnotherPlayer`, or configuring this command in your IDE.
+developmentEnvironmentUserName = Developer
+
+# Enables modern Java syntax support. Valid values:
+# - false: No modern syntax, Java 8 only
+# - jabel: Jabel syntax-only support, compiles to J8 bytecode
+# - jvmDowngrader: Full modern Java via JVM Downgrader (syntax + stdlib APIs)
+# - modern: Native modern Java bytecode, no downgrading
+enableModernJavaSyntax = jabel
+
+# If set, ignores the above setting and compiles with the given toolchain. This may cause unexpected issues,
+# and should *not* be used in most situations. -1 disables this.
+# forceToolchainVersion = -1
+
+# Target JVM version for JVM Downgrader bytecode downgrading.
+# Only used when enableModernJavaSyntax = jvmDowngrader
+# downgradeTargetVersion = 8
+
+# Comma-separated list of Java versions for multi-release jar support (JVM Downgrader only).
+# Classes will be available in META-INF/versions/N/ for each version N in this list.
+# Default: "21,25" (J25+ gets native classes, J21-24 gets partial downgrade, J8-20 gets full downgrade).
+# jvmDowngraderMultiReleaseVersions = 21,25
+
+# Specifies how JVM Downgrader API stubs are provided. Options:
+# - shade: Shade minimized stubs into the jar
+# - gtnhlib: GTNHLib provides stubs at runtime (adds version constraint)
+# - external: Another dependency provides stubs (no constraint, no warning)
+# - (empty): Warning reminding you to configure stubs
+# Note: 'shade' option requires you to verify license compliance, see: https://github.com/unimined/JvmDowngrader/blob/main/LICENSE.md
+# jvmDowngraderStubsProvider =
+
+# Enables injecting missing generics into the decompiled source code for a better coding experience.
+# Turns most publicly visible List, Map, etc. into proper List<E>, Map<K, V> types.
+enableGenericInjection = true
+
+# Generate a class with a String field for the mod version named as defined below.
+# If generateGradleTokenClass is empty or not missing, no such class will be generated.
+# If gradleTokenVersion is empty or missing, the field will not be present in the class.
+generateGradleTokenClass = com.gtnewhorizon.structurelib.Tags
+
+# Name of the token containing the project's current version to generate/replace.
+gradleTokenVersion = VERSION
+
+# [DEPRECATED] Mod ID replacement token.
 gradleTokenModId =
+
+# [DEPRECATED] Mod name replacement token.
 gradleTokenModName =
-gradleTokenVersion = GRADLETOKEN_VERSION
+
+# [DEPRECATED] Mod Group replacement token.
 gradleTokenGroupName =
 
-# In case your mod provides an API for other mods to implement you may declare its package here. Otherwise you can
+# [DEPRECATED]
+# Multiple source files can be defined here by providing a comma-separated list: Class1.java,Class2.java,Class3.java
+# public static final String VERSION = "GRADLETOKEN_VERSION";
+# The string's content will be replaced with your mod's version when compiled. You should use this to specify your mod's
+# version in @Mod([...], version = VERSION, [...]).
+# Leave these properties empty to skip individual token replacements.
+replaceGradleTokenInFile =
+
+# In case your mod provides an API for other mods to implement you may declare its package here. Otherwise, you can
 # leave this property empty.
-# Example value: apiPackage = api + modGroup = com.myname.mymodid -> com.myname.mymodid.api
+# Example value: (apiPackage = api) + (modGroup = com.myname.mymodid) -> com.myname.mymodid.api
 apiPackage =
 
-# Specify the configuration file for Forge's access transformers here. I must be placed into /src/main/resources/META-INF/
+# Specify the configuration file for Forge's access transformers here. It must be placed into /src/main/resources/META-INF/
-# Example value: mymodid_at.cfg
+# There can be multiple files in a space-separated list.
+# Example value: mymodid_at.cfg nei_at.cfg
 accessTransformersFile =
 
 # Provides setup for Mixins if enabled. If you don't know what mixins are: Keep it disabled!
-usesMixins = false
+usesMixins = true
+
+# Set to a non-empty string to configure mixins in a separate source set under src/VALUE, instead of src/main.
+# This can speed up compile times thanks to not running the mixin annotation processor on all input sources.
+# Mixin classes will have access to "main" classes, but not the other way around.
+separateMixinSourceSet =
+
+# Adds some debug arguments like verbose output and class export.
+usesMixinDebug = false
+
 # Specify the location of your implementation of IMixinConfigPlugin. Leave it empty otherwise.
 mixinPlugin =
-# Specify the package that contains all of your Mixins. You may only place Mixins in this package or the build will fail!
+
-mixinsPackage =
+# Specify the package that contains all of your Mixins. The package must exist or
+# the build will fail. If you have a package property defined in your mixins.<modid>.json,
+# it must match with this or the build will fail.
+mixinsPackage = mixins
+
 # Specify the core mod entry class if you use a core mod. This class must implement IFMLLoadingPlugin!
-# This parameter is for legacy compatability only
+# This parameter is for legacy compatibility only
-# Example value: coreModClass = asm.FMLPlugin + modGroup = com.myname.mymodid -> com.myname.mymodid.asm.FMLPlugin
+# Example value: (coreModClass = asm.FMLPlugin) + (modGroup = com.myname.mymodid) -> com.myname.mymodid.asm.FMLPlugin
-coreModClass =
+coreModClass = core.StructureLibCore
+
 # If your project is only a consolidation of mixins or a core mod and does NOT contain a 'normal' mod ( = some class
 # that is annotated with @Mod) you want this to be true. When in doubt: leave it on false!
 containsMixinsAndOrCoreModOnly = false
 
-# If enabled, you may use 'shadowImplementation' for dependencies. They will be integrated in your jar. It is your
+# Enables Mixins even if this mod doesn't use them, useful if one of the dependencies uses mixins.
-# responsibility check the licence and request permission for distribution, if required.
+forceEnableMixins = false
+
+# If enabled, you may use 'shadowCompile' for dependencies. They will be integrated into your jar. It is your
+# responsibility to check the license and request permission for distribution if required.
 usesShadowedDependencies = false
+
+# If disabled, won't remove unused classes from shadowed dependencies. Some libraries use reflection to access
+# their own classes, making the minimization unreliable.
+minimizeShadowedDependencies = true
+
+# If disabled, won't rename the shadowed classes.
+relocateShadowedDependencies = true
+
+# Adds CurseMaven, Modrinth, and some more well-known 1.7.10 repositories.
+includeWellKnownRepositories = true
+
+# A list of repositories to exclude from the includeWellKnownRepositories setting. Should be a space separated
+# list of strings, with the acceptable keys being(case does not matter):
+# cursemaven
+# modrinth
+excludeWellKnownRepositories =
+
+# Change these to your Maven coordinates if you want to publish to a custom Maven repository instead of the default GTNH Maven.
+# Authenticate with the MAVEN_USER and MAVEN_PASSWORD environment variables.
+# If you need a more complex setup disable maven publishing here and add a publishing repository to addon.gradle.
+usesMavenPublishing = true
+
+# Maven repository to publish the mod to.
+# mavenPublishUrl = https\://nexus.gtnewhorizons.com/repository/releases/
+
+# Publishing to Modrinth requires you to set the MODRINTH_TOKEN environment variable to your current Modrinth API token.
+#
+# The project's ID on Modrinth. Can be either the slug or the ID.
+# Leave this empty if you don't want to publish to Modrinth.
+modrinthProjectId =
+
+# The project's relations on Modrinth. You can use this to refer to other projects on Modrinth.
+# Syntax: scope1-type1:name1;scope2-type2:name2;...
+# Where scope can be one of [required, optional, incompatible, embedded],
+#       type can be one of [project, version],
+#       and the name is the Modrinth project or version slug/id of the other mod.
+# Example: required-project:fplib;optional-project:gasstation;incompatible-project:gregtech
+# Note: UniMixins is automatically set as a required dependency if usesMixins = true.
+modrinthRelations =
+
+# Publishing to CurseForge requires you to set the CURSEFORGE_TOKEN environment variable to one of your CurseForge API tokens.
+#
+# The project's numeric ID on CurseForge. You can find this in the About Project box.
+# Leave this empty if you don't want to publish on CurseForge.
+curseForgeProjectId =
+
+# The project's relations on CurseForge. You can use this to refer to other projects on CurseForge.
+# Syntax: type1:name1;type2:name2;...
+# Where type can be one of [requiredDependency, embeddedLibrary, optionalDependency, tool, incompatible],
+#       and the name is the CurseForge project slug of the other mod.
+# Example: requiredDependency:railcraft;embeddedLibrary:cofhlib;incompatible:buildcraft
+# Note: UniMixins is automatically set as a required dependency if usesMixins = true.
+curseForgeRelations =
+
+# Optional parameter to customize the produced artifacts. Use this to preserve artifact naming when migrating older
+# projects. New projects should not use this parameter.
+# customArchiveBaseName =
+
+# Optional parameter to customize the default working directory used by the runClient* tasks. Relative to the project directory.
+# runClientWorkingDirectory = run/client
+
+# Optional parameter to customize the default working directory used by the runServer* tasks. Relative to the project directory.
+# runServerWorkingDirectory = run/server
+
+# Optional parameter to have the build automatically fail if an illegal version is used.
+# This can be useful if you e.g. only want to allow versions in the form of '1.1.xxx'.
+# The check is ONLY performed if the version is a git tag.
+# Note: the specified string must be escaped, so e.g. 1\\.1\\.\\d+ instead of 1\.1\.\d+
+# versionPattern =
+
+# Uncomment to prevent the source code from being published.
+# noPublishedSources = true
+
+# Uncomment this to disable Spotless checks.
+# This should only be uncommented to keep it easier to sync with upstream/other forks.
+# That is, if there is no other active fork/upstream, NEVER change this.
+# disableSpotless = true
+
+# Uncomment this to disable Checkstyle checks (currently wildcard import check).
+# disableCheckstyle = true
+
+# Override the IDEA build type. Valid values are: "" (leave blank, do not override), "idea" (force use native IDEA build), "gradle"
+# (force use delegated build).
+# This is meant to be set in $HOME/.gradle/gradle.properties.
+# e.g. add "systemProp.org.gradle.project.ideaOverrideBuildType=idea" will override the build type to be native build.
+# WARNING: If you do use this option, it will overwrite whatever you have in your existing projects. This might not be what you want!
+# Usually there is no need to uncomment this here as other developers do not necessarily use the same build type as you.
+# ideaOverrideBuildType = idea
+
+# Whether IDEA should run spotless checks when pressing the Build button.
+# This is meant to be set in $HOME/.gradle/gradle.properties.
+# ideaCheckSpotlessOnBuild = true
+
+# Non-GTNH properties
+org.gradle.configuration-cache = true
+org.gradle.parallel = true

gradle/gradle-daemon-jvm.properties

@@ -0,0 +1,12 @@
+#This file is generated by updateDaemonJvm
+toolchainUrl.FREE_BSD.AARCH64=https\://api.foojay.io/disco/v3.0/ids/cf726b4a1c84b50457225f9bba6d7650/redirect
+toolchainUrl.FREE_BSD.X86_64=https\://api.foojay.io/disco/v3.0/ids/fa1e318c287360478e3c83a9a3ef1007/redirect
+toolchainUrl.LINUX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/cf726b4a1c84b50457225f9bba6d7650/redirect
+toolchainUrl.LINUX.X86_64=https\://api.foojay.io/disco/v3.0/ids/fa1e318c287360478e3c83a9a3ef1007/redirect
+toolchainUrl.MAC_OS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/c2dd35c9d0aaf0ba6ad0791320f99dfc/redirect
+toolchainUrl.MAC_OS.X86_64=https\://api.foojay.io/disco/v3.0/ids/e5810bd7fd1f8a586644409d395a7e55/redirect
+toolchainUrl.UNIX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/cf726b4a1c84b50457225f9bba6d7650/redirect
+toolchainUrl.UNIX.X86_64=https\://api.foojay.io/disco/v3.0/ids/fa1e318c287360478e3c83a9a3ef1007/redirect
+toolchainUrl.WINDOWS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/7b3c4877c0749019e6805bb61e421497/redirect
+toolchainUrl.WINDOWS.X86_64=https\://api.foojay.io/disco/v3.0/ids/d76df094a9cbbabd3b08251f9e61444a/redirect
+toolchainVersion=25

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.9.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
+#!/bin/sh
 
 #
-# Copyright 2015 the original author or authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,80 +15,114 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
-##
+#
-##  Gradle start up script for UN*X
+#   Gradle start up script for POSIX generated by Gradle.
-##
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/b631911858264c0b6e4d6603d677ff5218766cee/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
+app_path=$0
-# Need this for relative symlinks.
+
-while [ -h "$PRG" ] ; do
+# Need this for daisy-chained symlinks.
-    ls=`ls -ld "$PRG"`
+while
-    link=`expr "$ls" : '.*-> \(.*\)$'`
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
-    if expr "$link" : '/.*' > /dev/null; then
+    [ -h "$app_path" ]
-        PRG="$link"
+do
-    else
+    ls=$( ls -ld "$app_path" )
-        PRG=`dirname "$PRG"`"/$link"
+    link=${ls#*' -> '}
-    fi
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
 
-APP_NAME="Gradle"
+# This is normally unused
-APP_BASE_NAME=`basename "$0"`
+# shellcheck disable=SC2034
-
+APP_BASE_NAME=${0##*/}
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
 warn () {
     echo "$*"
-}
+} >&2
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
+case "$( uname )" in                #(
-  CYGWIN* )
+  CYGWIN* )         cygwin=true  ;; #(
-    cygwin=true
+  Darwin* )         darwin=true  ;; #(
-    ;;
+  MSYS* | MINGW* )  msys=true    ;; #(
-  Darwin* )
+  NONSTOP* )        nonstop=true ;;
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
 
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -97,92 +131,118 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
+    JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
+    case $MAX_FD in #(
-    if [ $? -eq 0 ] ; then
+      max*)
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-            MAX_FD="$MAX_FD_LIMIT"
+        # shellcheck disable=SC2039,SC3045
-        fi
+        MAX_FD=$( ulimit -H -n ) ||
-        ulimit -n $MAX_FD
+            warn "Could not query maximum file descriptor limit"
-        if [ $? -ne 0 ] ; then
+    esac
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
+    case $MAX_FD in  #(
-        fi
+      '' | soft) :;; #(
-    else
+      *)
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-    fi
+        # shellcheck disable=SC2039,SC3045
-fi
+        ulimit -n "$MAX_FD" ||
-
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=$((i+1))
-    done
-    case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
-# Escape application args
+# Collect all arguments for the java command, stacking in reverse order:
-save () {
+#   * args from the command line
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+#   * the main class name
-    echo " "
+#   * -classpath
-}
+#   * -D...appname settings
-APP_ARGS=$(save "$@")
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
+# For Cygwin or MSYS, switch paths to Windows format before running java
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+
-  cd "$(dirname "$0")"
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
 exec "$JAVACMD" "$@"

gradlew.bat

@@ -13,8 +13,10 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
-@if "%DEBUG%" == "" @echo off
+@if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
 @rem  Gradle startup script for Windows
@@ -25,10 +27,14 @@
 if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
@@ -37,13 +43,13 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
+if %ERRORLEVEL% equ 0 goto execute
 
-echo.
+echo. 1>&2
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
-echo.
+echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation.
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -51,48 +57,35 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
-if exist "%JAVA_EXE%" goto init
+if exist "%JAVA_EXE%" goto execute
 
-echo.
+echo. 1>&2
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
-echo.
+echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation.
+echo location of your Java installation. 1>&2
 
 goto fail
 
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
+if %ERRORLEVEL% equ 0 goto mainEnd
 
 :fail
 rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
 rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+set EXIT_CODE=%ERRORLEVEL%
-exit /b 1
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
 
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal

repositories.gradle

@@ -1,5 +1,4 @@
 // Add any additional repositiroes for your dependencies here
 
 repositories {
-
 }

settings.gradle

@@ -0,0 +1,23 @@
+
+pluginManagement {
+    repositories {
+        maven {
+            // RetroFuturaGradle
+            name "GTNH Maven"
+            url "https://nexus.gtnewhorizons.com/repository/public/"
+            mavenContent {
+                includeGroup("com.gtnewhorizons")
+                includeGroupByRegex("com\\.gtnewhorizons\\..+")
+            }
+        }
+        gradlePluginPortal()
+        mavenCentral()
+        mavenLocal()
+    }
+}
+
+plugins {
+    id 'com.gtnewhorizons.gtnhsettingsconvention' version '2.0.26'
+}
+
+

src/main/java/com/gtnewhorizon/structurelib/ChannelDescription.java

@@ -0,0 +1,94 @@
+package com.gtnewhorizon.structurelib;
+
+import java.util.AbstractMap;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import net.minecraft.item.ItemStack;
+
+import com.gtnewhorizon.gtnhlib.util.map.ItemStackMap;
+
+import cpw.mods.fml.common.Loader;
+
+// this is not an API! go check StructureLibAPI instead!
+public class ChannelDescription {
+
+    private static final ItemStackMap<Set<ChannelDescription>> itemToChannels = new ItemStackMap<>(true);
+    private static final Map<String, ChannelDescription> registry = new HashMap<>();
+    private final String channel;
+    private final Map<String, String> descriptions = new HashMap<>();
+    private final ItemStackMap<Integer> items = new ItemStackMap<>(true);
+
+    public static ChannelDescription get(final String channel) {
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        return registry.computeIfAbsent(channel, ChannelDescription::new);
+    }
+
+    public static boolean has(final String channel) {
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        return registry.containsKey(channel);
+    }
+
+    public static Collection<Map.Entry<String, Integer>> iterate(final ItemStack block) {
+        Set<ChannelDescription> channels = itemToChannels.get(block);
+        if (channels == null) return Collections.emptySet();
+        return channels.stream().map(d -> new AbstractMap.SimpleImmutableEntry<>(d.channel, d.items.get(block)))
+                .collect(Collectors.toList());
+    }
+
+    public static void set(final String channel, final String modid, final String description) {
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        registry.computeIfAbsent(channel, ChannelDescription::new).add(modid, description);
+    }
+
+    public static void item(final String channel, int channelValue, ItemStack stack) {
+        if (StructureLibAPI.isDebugEnabled()) {
+            if (!channel.toLowerCase(Locale.ROOT).equals(channel)) {
+                throw new IllegalArgumentException("Channel name can be lower case ONLY");
+            }
+            if (channelValue <= 0) {
+                throw new IllegalArgumentException("Channel value must be greater than 0");
+            }
+        }
+        ChannelDescription inst = registry.computeIfAbsent(channel, ChannelDescription::new);
+        inst.items.put(stack, channelValue);
+        itemToChannels.computeIfAbsent(stack, s -> new HashSet<>()).add(inst);
+    }
+
+    public static Map<String, ChannelDescription> getAll() {
+        return Collections.unmodifiableMap(registry);
+    }
+
+    private ChannelDescription(String channel) {
+        this.channel = channel;
+    }
+
+    public String getChannel() {
+        return channel;
+    }
+
+    public ChannelDescription add(String modid, String description) {
+        if (Loader.instance().getIndexedModList().get(modid) == null) {
+            throw new IllegalArgumentException("Mod not found: " + modid);
+        }
+        descriptions.put(modid, description);
+        return this;
+    }
+
+    public Map<String, String> getDescriptions() {
+        return Collections.unmodifiableMap(descriptions);
+    }
+
+    public Map<ItemStack, Integer> getItems() {
+        return Collections.unmodifiableMap(items);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/ClientProxy.java

@@ -0,0 +1,653 @@
+package com.gtnewhorizon.structurelib;
+
+import static com.gtnewhorizon.structurelib.StructureLib.RANDOM;
+
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import net.minecraft.block.Block;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.entity.EntityClientPlayerMP;
+import net.minecraft.client.gui.GuiNewChat;
+import net.minecraft.client.particle.EntityFX;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.renderer.culling.Frustrum;
+import net.minecraft.client.renderer.texture.TextureMap;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.profiler.Profiler;
+import net.minecraft.util.ChatComponentText;
+import net.minecraft.util.IChatComponent;
+import net.minecraft.util.IIcon;
+import net.minecraft.util.Vec3;
+import net.minecraft.world.World;
+import net.minecraftforge.client.event.RenderWorldLastEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.common.config.ConfigElement;
+import net.minecraftforge.event.entity.EntityJoinWorldEvent;
+import net.minecraftforge.event.world.WorldEvent;
+
+import org.apache.commons.lang3.tuple.Pair;
+import org.lwjgl.opengl.GL11;
+
+import com.gtnewhorizon.structurelib.entity.fx.WeightlessParticleFX;
+import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
+import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
+
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.event.ConfigChangedEvent;
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.eventhandler.EventPriority;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.common.gameevent.TickEvent.ClientTickEvent;
+import cpw.mods.fml.common.gameevent.TickEvent.Phase;
+import cpw.mods.fml.common.network.FMLNetworkEvent;
+
+public class ClientProxy extends CommonProxy {
+
+    private static final short[] RGBA_NO_TINT = { 255, 255, 255, 255 };
+    private static final short[] RGBA_RED_TINT = { 255, 128, 128, 0 };
+    private static final Map<HintParticleInfo, HintGroup> allHints = new HashMap<>();
+    /**
+     * All batches of hints.
+     */
+    private static final List<HintGroup> allGroups = new ArrayList<>();
+
+    /**
+     * Current batch of hints. Belongs to the same logical multiblock.
+     */
+    private static HintGroup currentHints;
+    /**
+     * Collection of all hints. Sorted from farthest (index 0) to nearest (index size - 1)
+     * <p>
+     * 10k should be more than enough, if not a bit wasteful
+     */
+    private static final List<HintParticleInfo> allHintsForRender = new ArrayList<>(10000);
+    /**
+     * If the diff to current player position is too great sort the allHints. Initial value is very far off below y=0
+     * but not huge enough to make a NaN.
+     * <p>
+     * We are using this supposedly immutable object as a mutable object here. So be aware.
+     */
+    private static final Vec3 lastPlayerPos = Vec3.createVectorHelper(0, -1e30, 0);
+    /**
+     * if true rebuild the allHints list from all hintOwners (and sort it)
+     */
+    private static boolean allHintsDirty = false;
+    /**
+     * counter keeping track of how many renderThrough hint particle we have. enable optimization if no renderThrough
+     */
+    private static int renderThrough;
+    /**
+     * A throttle map for local player. Integrated server will use the throttle map in super class instead.
+     */
+    private static final Map<Object, Long> localThrottleMap = new HashMap<>();
+
+    @Override
+    public void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {
+        ensureHinting();
+        HintParticleInfo info = new HintParticleInfo(w, x, y, z, icons, RGBa);
+
+        // check and remove colliding holograms
+        if (ConfigurationHandler.INSTANCE.isRemoveCollidingHologram()) {
+            HintGroup dupe = allHints.get(info);
+            if (dupe != null && dupe != currentHints) {
+                allGroups.remove(dupe);
+                removeGroup(dupe);
+            }
+        }
+        allHints.put(info, currentHints);
+        currentHints.getHints().add(info);
+        allHintsDirty = true;
+
+        EntityFX particle = new WeightlessParticleFX(
+                w,
+                x + RANDOM.nextFloat() * 0.5F,
+                y + RANDOM.nextFloat() * 0.5F,
+                z + RANDOM.nextFloat() * 0.5F,
+                0,
+                0,
+                0);
+        particle.setRBGColorF(0, 0.6F * RANDOM.nextFloat(), 0.8f);
+        Minecraft.getMinecraft().effectRenderer.addEffect(particle);
+    }
+
+    @Override
+    public void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa) {
+        hintParticleTinted(w, x, y, z, createIIconFromBlock(block, meta), RGBa);
+    }
+
+    @Override
+    public void hintParticle(World w, int x, int y, int z, IIcon[] icons) {
+        hintParticleTinted(w, x, y, z, icons, RGBA_NO_TINT);
+    }
+
+    @Override
+    public void hintParticle(World w, int x, int y, int z, Block block, int meta) {
+        hintParticleTinted(w, x, y, z, createIIconFromBlock(block, meta), RGBA_NO_TINT);
+    }
+
+    @Override
+    public boolean updateHintParticleTint(EntityPlayer player, World w, int x, int y, int z, short[] rgBa) {
+        if (player instanceof EntityPlayerMP) return super.updateHintParticleTint(player, w, x, y, z, rgBa);
+        if (player != getCurrentPlayer()) return false; // how?
+        HintParticleInfo hint = getHintParticleInfo(w, x, y, z);
+        if (hint == null) {
+            return false;
+        }
+        hint.setTint(rgBa);
+        return true;
+    }
+
+    private static HintParticleInfo getHintParticleInfo(World w, int x, int y, int z) {
+        HintParticleInfo info = new HintParticleInfo(w, x, y, z, null, null);
+        HintGroup existing = allHints.get(info);
+        if (existing != null) {
+            for (HintParticleInfo hint : existing.getHints()) {
+                if (hint.equals(info)) {
+                    return hint;
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public boolean markHintParticleError(EntityPlayer player, World w, int x, int y, int z) {
+        if (player instanceof EntityPlayerMP) return super.markHintParticleError(player, w, x, y, z);
+        if (player != getCurrentPlayer()) return false; // how?
+        HintParticleInfo hint = getHintParticleInfo(w, x, y, z);
+        if (hint == null) {
+            return false;
+        }
+        hint.setTint(RGBA_RED_TINT);
+        hint.setRenderThrough();
+        return true;
+    }
+
+    @Override
+    public void addThrottledChat(Object throttleKey, EntityPlayer player, IChatComponent text, short intervalRequired,
+            boolean forceUpdateLastSend) {
+        if (player instanceof EntityPlayerMP)
+            super.addThrottledChat(throttleKey, player, text, intervalRequired, forceUpdateLastSend);
+        else if (player != null)
+            addThrottledChat(throttleKey, player, text, intervalRequired, forceUpdateLastSend, localThrottleMap);
+    }
+
+    static void removeGroup(HintGroup group) {
+        for (HintParticleInfo hintParticleInfo : group.getHints()) {
+            allHints.remove(hintParticleInfo);
+            if (hintParticleInfo.renderThrough) renderThrough--;
+        }
+        allHintsDirty = true;
+    }
+
+    private static IIcon[] createIIconFromBlock(Block block, int meta) {
+        IIcon[] ret = new IIcon[6];
+        for (int i = 0; i < 6; i++) {
+            ret[i] = block.getIcon(i, meta);
+        }
+        return ret;
+    }
+
+    @Override
+    public void addClientSideChatMessages(String... messages) {
+        GuiNewChat chat = Minecraft.getMinecraft().ingameGUI.getChatGUI();
+        for (String s : messages) {
+            chat.printChatMessage(new ChatComponentText(s));
+        }
+    }
+
+    @Override
+    public EntityPlayer getCurrentPlayer() {
+        return Minecraft.getMinecraft().thePlayer;
+    }
+
+    @Override
+    public boolean isCurrentPlayer(EntityPlayer player) {
+        return player == Minecraft.getMinecraft().thePlayer;
+    }
+
+    @Override
+    public void startHinting(World w) {
+        if (!w.isRemote) return;
+        if (currentHints != null) endHinting(w);
+        currentHints = new HintGroup();
+    }
+
+    private void ensureHinting() {
+        if (currentHints == null) currentHints = new HintGroup();
+    }
+
+    @Override
+    public void endHinting(World w) {
+        if (!w.isRemote || currentHints == null) return;
+        while (!allGroups.isEmpty() && allGroups.size() >= ConfigurationHandler.INSTANCE.getMaxCoexistingHologram()) {
+            allGroups.remove(0);
+        }
+        if (!currentHints.getHints().isEmpty()) allGroups.add(currentHints);
+        // we use the player existence time here as some worlds don't really advance the time ticker
+        currentHints.setCreationTime(getCurrentPlayer().ticksExisted);
+        currentHints = null;
+    }
+
+    @Override
+    public long getOverworldTime() {
+        // there is no overworld, better just hope current world time is ok...
+        return Minecraft.getMinecraft().theWorld.getTotalWorldTime();
+    }
+
+    @Override
+    public void uploadChannels(ItemStack trigger) {
+        StructureLib.net.sendToServer(new SetChannelDataMessage(trigger));
+    }
+
+    @Override
+    public void preInit(FMLPreInitializationEvent e) {
+        FMLCommonHandler.instance().bus().register(new FMLEventHandler());
+        MinecraftForge.EVENT_BUS.register(new ForgeEventHandler());
+    }
+
+    static void markTextureUsed(IIcon icon) {
+        if (StructureLib.COMPAT instanceof IStructureCompat)
+            ((IStructureCompat) StructureLib.COMPAT).markTextureUsed(icon);
+    }
+
+    static void sendRegistryOrderToServer() {
+        if (FMLEventHandler.configSent) return;
+        FMLEventHandler.configSent = true;
+        for (String s : SortedRegistry.ALL_REGISTRIES.keySet()) {
+            Pair<List<String>, List<String>> registryOrder = ConfigurationHandler.INSTANCE.getRegistryOrder(s);
+            if (registryOrder == null || registryOrder.getKey().isEmpty() && registryOrder.getValue().isEmpty())
+                continue;
+            StructureLib.net
+                    .sendToServer(new RegistryOrderSyncMessage(s, registryOrder.getKey(), registryOrder.getValue()));
+        }
+    }
+
+    @Override
+    public void loadComplete(FMLLoadCompleteEvent evt) {
+        super.loadComplete(evt);
+        for (Map.Entry<String, WeakReference<SortedRegistry<?>>> e : SortedRegistry.ALL_REGISTRIES.entrySet()) {
+            SortedRegistry<?> r = e.getValue().get();
+            if (r == null) continue;
+            Pair<List<String>, List<String>> p = ConfigurationHandler.INSTANCE.getRegistryOrder(e.getKey());
+            r.registerOrdering(getSPPlayerUUID(), p.getKey(), p.getValue());
+        }
+    }
+
+    public UUID getSPPlayerUUID() {
+        return EntityPlayer.func_146094_a(Minecraft.getMinecraft().getSession().func_148256_e());
+    }
+
+    public void displayConfigGUI(String category) {
+        ConfigElement<Object> element = new ConfigElement<>(
+                ConfigurationHandler.INSTANCE.getConfig().getCategory(category));
+        GuiConfig guiConfig = new GuiConfig(
+                null,
+                element.getChildElements(),
+                StructureLibAPI.MOD_ID,
+                null,
+                false,
+                false,
+                I18n.format(element.getLanguageKey()));
+        Minecraft.getMinecraft().displayGuiScreen(guiConfig);
+    }
+
+    private static class HintGroup {
+
+        private final List<HintParticleInfo> hints = new LinkedList<>();
+        private int creationTime = -1;
+
+        public List<HintParticleInfo> getHints() {
+            return hints;
+        }
+
+        public void setCreationTime(int creationTime) {
+            this.creationTime = creationTime;
+        }
+
+        public int getCreationTime() {
+            return creationTime;
+        }
+    }
+
+    private static class HintParticleInfo {
+
+        private final World w;
+        // these are the block coordinate for e.g. w.getBlock()
+        private final int x, y, z;
+        private final IIcon[] icons;
+        private short[] tint;
+        private boolean renderThrough;
+
+        private final long creationTime = System.currentTimeMillis(); // use tick time instead maybe
+
+        public HintParticleInfo(World w, int x, int y, int z, IIcon[] icons, short[] tint) {
+            this.w = w;
+            this.x = x;
+            this.y = y;
+            this.z = z;
+            this.icons = icons;
+            this.tint = tint;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (!(o instanceof HintParticleInfo that)) return false;
+
+            return x == that.x && y == that.y && z == that.z;
+        }
+
+        public void setTint(short[] tint) {
+            this.tint = tint;
+        }
+
+        public void setRenderThrough() {
+            if (!this.renderThrough) {
+                ClientProxy.renderThrough += 1;
+                allHintsDirty = true;
+            }
+            this.renderThrough = true;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = x;
+            result = 31 * result + y;
+            result = 31 * result + z;
+            return result;
+        }
+
+        public boolean isInFrustrum(Frustrum frustrum) {
+            return frustrum.isBoxInFrustum(x + 0.25, y + 0.25, z + 0.25, x + 0.75, y + 0.75, z + 0.75);
+        }
+
+        public void draw(Tessellator tes, double eyeX, double eyeY, double eyeZ, int eyeXint, int eyeYint,
+                int eyeZint) {
+            double size = 0.5;
+
+            int brightness = w.blockExists(x, 0, z) ? w.getLightBrightnessForSkyBlocks(x, y, z, 0) : 0;
+            tes.setBrightness(brightness);
+
+            tes.setColorRGBA(
+                    (int) (tint[0] * .9F),
+                    (int) (tint[1] * .95F),
+                    (int) (tint[2] * 1F),
+                    ConfigurationHandler.INSTANCE.getHintTransparency());
+
+            double X = (x - eyeXint) + 0.25;
+            double Y = (y - eyeYint) + 0.25;
+            double Z = (z - eyeZint) + 0.25;
+            double worldX = x + 0.25;
+            double worldY = y + 0.25;
+            double worldZ = z + 0.25;
+
+            // cube is a very special model. its facings can be rendered correctly by viewer distance without using
+            // surface normals and view vector
+            // here we do a 2 pass render.
+            // first pass we draw obstructed faces (i.e. faces that are further away from player)
+            // second pass we draw unobstructed faces
+            for (int j = 0; j < 2; j++) {
+                boolean unobstructedPass = j == 1;
+                for (int i = 0; i < 6; i++) {
+                    if (icons[i] == null) continue;
+
+                    markTextureUsed(icons[i]);
+
+                    double u = icons[i].getMinU();
+                    double U = icons[i].getMaxU();
+                    double v = icons[i].getMinV();
+                    double V = icons[i].getMaxV();
+                    switch (i) { // {DOWN, UP, NORTH, SOUTH, WEST, EAST}
+                        case 0:
+                            // all these ifs is in form if ((is face unobstructed) != (is in unobstructred pass))
+                            if ((worldY >= eyeY) != unobstructedPass) continue;
+                            tes.setNormal(0, -1, 0);
+                            tes.addVertexWithUV(X, Y, Z + size, u, V);
+                            tes.addVertexWithUV(X, Y, Z, u, v);
+                            tes.addVertexWithUV(X + size, Y, Z, U, v);
+                            tes.addVertexWithUV(X + size, Y, Z, U, v);
+                            tes.addVertexWithUV(X + size, Y, Z + size, U, V);
+                            tes.addVertexWithUV(X, Y, Z + size, u, V);
+                            break;
+                        case 1:
+                            if ((worldY + size <= eyeY) != unobstructedPass) continue;
+                            tes.setNormal(0, 1, 0);
+                            tes.addVertexWithUV(X, Y + size, Z, u, v);
+                            tes.addVertexWithUV(X, Y + size, Z + size, u, V);
+                            tes.addVertexWithUV(X + size, Y + size, Z + size, U, V);
+                            tes.addVertexWithUV(X + size, Y + size, Z + size, U, V);
+                            tes.addVertexWithUV(X + size, Y + size, Z, U, v);
+                            tes.addVertexWithUV(X, Y + size, Z, u, v);
+                            break;
+                        case 2:
+                            if ((worldZ >= eyeZ) != unobstructedPass) continue;
+                            tes.setNormal(0, 0, -1);
+                            tes.addVertexWithUV(X, Y, Z, U, V);
+                            tes.addVertexWithUV(X, Y + size, Z, U, v);
+                            tes.addVertexWithUV(X + size, Y + size, Z, u, v);
+                            tes.addVertexWithUV(X + size, Y + size, Z, u, v);
+                            tes.addVertexWithUV(X + size, Y, Z, u, V);
+                            tes.addVertexWithUV(X, Y, Z, U, V);
+                            break;
+                        case 3:
+                            if ((worldZ + size <= eyeZ) != unobstructedPass) continue;
+                            tes.setNormal(0, 0, 1);
+                            tes.addVertexWithUV(X + size, Y, Z + size, U, V);
+                            tes.addVertexWithUV(X + size, Y + size, Z + size, U, v);
+                            tes.addVertexWithUV(X, Y + size, Z + size, u, v);
+                            tes.addVertexWithUV(X, Y + size, Z + size, u, v);
+                            tes.addVertexWithUV(X, Y, Z + size, u, V);
+                            tes.addVertexWithUV(X + size, Y, Z + size, U, V);
+                            break;
+                        case 4:
+                            if ((worldX >= eyeX) != unobstructedPass) continue;
+                            tes.setNormal(-1, 0, 0);
+                            tes.addVertexWithUV(X, Y, Z + size, U, V);
+                            tes.addVertexWithUV(X, Y + size, Z + size, U, v);
+                            tes.addVertexWithUV(X, Y + size, Z, u, v);
+                            tes.addVertexWithUV(X, Y + size, Z, u, v);
+                            tes.addVertexWithUV(X, Y, Z, u, V);
+                            tes.addVertexWithUV(X, Y, Z + size, U, V);
+                            break;
+                        case 5:
+                            if ((worldX + size <= eyeX) != unobstructedPass) continue;
+                            tes.setNormal(1, 0, 0);
+                            tes.addVertexWithUV(X + size, Y, Z, U, V);
+                            tes.addVertexWithUV(X + size, Y + size, Z, U, v);
+                            tes.addVertexWithUV(X + size, Y + size, Z + size, u, v);
+                            tes.addVertexWithUV(X + size, Y + size, Z + size, u, v);
+                            tes.addVertexWithUV(X + size, Y, Z + size, u, V);
+                            tes.addVertexWithUV(X + size, Y, Z, U, V);
+                            break;
+                    }
+                }
+            }
+        }
+
+        public long getCreationTime() {
+            return creationTime;
+        }
+
+        public double getSquareDistanceTo(Vec3 point) {
+            return point.squareDistanceTo(x + 0.5, y + 0.5, z + 0.5);
+        }
+    }
+
+    public static class FMLEventHandler {
+
+        static boolean connected = false;
+        static boolean configSent = false;
+
+        private void resetPlayerLocation() {
+            lastPlayerPos.xCoord = Minecraft.getMinecraft().thePlayer.posX;
+            lastPlayerPos.yCoord = Minecraft.getMinecraft().thePlayer.posY;
+            lastPlayerPos.zCoord = Minecraft.getMinecraft().thePlayer.posZ;
+        }
+
+        @SubscribeEvent
+        public void onPlayerLogIn(FMLNetworkEvent.ClientConnectedToServerEvent e) {
+            connected = true;
+            configSent = false;
+        }
+
+        @SubscribeEvent
+        public void onPlayerLogOut(FMLNetworkEvent.ClientDisconnectionFromServerEvent e) {
+            connected = false;
+        }
+
+        @SubscribeEvent(priority = EventPriority.LOWEST)
+        public void onConfigChange(ConfigChangedEvent.PostConfigChangedEvent e) {
+            if (connected && e.modID.equals(StructureLibAPI.MOD_ID)) {
+                configSent = false;
+                sendRegistryOrderToServer();
+            }
+        }
+
+        @SubscribeEvent
+        public void onClientTick(ClientTickEvent e) {
+            if (e.phase == Phase.END && Minecraft.getMinecraft().thePlayer != null) {
+                Vec3 playerPos = Minecraft.getMinecraft().thePlayer.getPosition(1);
+                boolean sortRequired = false;
+                // The allGroups is implicitly sorted by creationTime
+                // here we exploit this ordering to reduce iteration size
+                int deadline = Minecraft.getMinecraft().thePlayer.ticksExisted
+                        - ConfigurationHandler.INSTANCE.getHintLifespan();
+                int i;
+                for (i = 0; i < allGroups.size(); i++) {
+                    if (allGroups.get(i).getCreationTime() > deadline) {
+                        break;
+                    }
+                }
+                if (i != 0) {
+                    sortRequired = true;
+                    // clear this block and go no further
+                    List<HintGroup> toRemove = allGroups.subList(0, i);
+                    toRemove.forEach(ClientProxy::removeGroup);
+                    toRemove.clear();
+                }
+                if (allHintsDirty) {
+                    allHintsForRender.clear();
+                    // we need greatly efficient sequential access and mildly efficient sorting
+                    // rebuild is sort of rare, and it's expected to lag anyway
+                    // so no min-heap here
+                    for (HintGroup c : allGroups) allHintsForRender.addAll(c.getHints());
+                    sortRequired = true;
+                }
+                if (sortRequired || playerPos.squareDistanceTo(lastPlayerPos) > 1e-2) {
+                    // only redo sort if player moved some distance
+                    // default is 0.1 block
+                    // if there was a full rebuild, go sort it as well
+                    allHintsForRender.sort(Comparator.comparingDouble(info -> -info.getSquareDistanceTo(playerPos)));
+                    resetPlayerLocation();
+                }
+            }
+        }
+    }
+
+    public static class ForgeEventHandler {
+
+        @SubscribeEvent
+        public void onEntityJoinWorld(EntityJoinWorldEvent e) {
+            if (e.world.isRemote && e.entity instanceof EntityClientPlayerMP) {
+                sendRegistryOrderToServer();
+            }
+        }
+
+        @SubscribeEvent
+        public void onWorldLoad(WorldEvent.Load e) {
+            if (e.world.isRemote) {
+                // flush hints. we are in a different world now.
+                allHintsForRender.clear();
+                allGroups.clear();
+                lastPlayerPos.yCoord = -1e30;
+                renderThrough = 0;
+                // clear throttles. hopefully a world switch is enough long as a cool down.
+                localThrottleMap.clear();
+            }
+        }
+
+        @SubscribeEvent
+        public void onRenderWorldLast(RenderWorldLastEvent e) {
+            if (allHintsForRender.isEmpty()) return;
+
+            // seriously, I'm not a OpenGL expert, so I'm probably doing a lot of very stupid stuff here.
+            // Please consider contributing patches if you find something to optimize.
+
+            Profiler p = Minecraft.getMinecraft().mcProfiler;
+
+            p.startSection("HintParticle");
+            p.startSection("Prepare");
+            Frustrum frustrum = new Frustrum();
+            Entity entitylivingbase = Minecraft.getMinecraft().renderViewEntity;
+            double d0 = entitylivingbase.lastTickPosX
+                    + (entitylivingbase.posX - entitylivingbase.lastTickPosX) * e.partialTicks;
+            double d1 = entitylivingbase.lastTickPosY
+                    + (entitylivingbase.posY - entitylivingbase.lastTickPosY) * e.partialTicks;
+            double d2 = entitylivingbase.lastTickPosZ
+                    + (entitylivingbase.posZ - entitylivingbase.lastTickPosZ) * e.partialTicks;
+            int i0 = (int) d0, i1 = (int) d1, i2 = (int) d2;
+            frustrum.setPosition(d0, d1, d2);
+
+            GL11.glPushMatrix();
+            GL11.glPushAttrib(GL11.GL_ENABLE_BIT | GL11.GL_COLOR_BUFFER_BIT); // TODO figure out original states
+            // we need the back facing rendered because the thing is transparent
+            GL11.glDisable(GL11.GL_CULL_FACE);
+            GL11.glDisable(GL11.GL_ALPHA_TEST);
+            GL11.glEnable(GL11.GL_BLEND); // enable blend so it is transparent
+            GL11.glBlendFunc(GL11.GL_ONE_MINUS_SRC_ALPHA, GL11.GL_SRC_ALPHA);
+            // depth test begin as enabled
+            boolean renderThrough = false;
+            Minecraft.getMinecraft().renderEngine.bindTexture(TextureMap.locationBlocksTexture);
+            GL11.glTranslated(-d0 + i0, -d1 + i1, -d2 + i2);
+            Tessellator tes = Tessellator.instance;
+            tes.startDrawing(GL11.GL_TRIANGLES);
+            for (int i = 0, allHintsForRenderSize = allHintsForRender.size(), cubeDrawn = 0; i
+                    < allHintsForRenderSize; i++, cubeDrawn++) {
+                HintParticleInfo hint = allHintsForRender.get(i);
+                if (!hint.isInFrustrum(frustrum)) continue;
+                if (renderThrough != hint.renderThrough) {
+                    if (i > 0) {
+                        p.endStartSection("Draw");
+                        tes.draw();
+                        tes.startDrawing(GL11.GL_TRIANGLES);
+                        cubeDrawn = 0;
+                        p.endStartSection("Prepare");
+                    }
+                    if (hint.renderThrough) GL11.glDisable(GL11.GL_DEPTH_TEST);
+                    else GL11.glEnable(GL11.GL_DEPTH_TEST);
+                    renderThrough = hint.renderThrough;
+                }
+                // Minecraft Tessellator draw in batch of 4096. This plays nicely with quads, but for trigs
+                // it might occasionally end up with one half in first batch and the other half in later batch.
+                // so we manually flush the buffer here if that would happen.
+                // 6 faces per particle, 2 trig per face, 3 vertex per trig
+                if ((cubeDrawn + 1) >= 4096 / (6 * 2 * 3)) {
+                    tes.draw();
+                    tes.startDrawing(GL11.GL_TRIANGLES);
+                }
+                hint.draw(tes, d0, d1, d2, i0, i1, i2);
+            }
+            p.endStartSection("Draw");
+            tes.draw();
+            p.endSection();
+
+            GL11.glPopAttrib();
+            GL11.glPopMatrix();
+            p.endSection();
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/CommonProxy.java

@@ -0,0 +1,128 @@
+package com.gtnewhorizon.structurelib;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.WeakHashMap;
+
+import net.minecraft.block.Block;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.util.IChatComponent;
+import net.minecraft.util.IIcon;
+import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
+
+import com.gtnewhorizon.structurelib.net.ErrorHintParticleMessage;
+import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
+
+import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.common.gameevent.TickEvent;
+
+public class CommonProxy {
+
+    public CommonProxy() {
+        super();
+        MinecraftForge.EVENT_BUS.register(new ForgeEventHandler());
+    }
+
+    public void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {}
+
+    public void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa) {}
+
+    public void hintParticle(World w, int x, int y, int z, IIcon[] icons) {}
+
+    public void hintParticle(World w, int x, int y, int z, Block block, int meta) {}
+
+    public boolean updateHintParticleTint(EntityPlayer player, World w, int x, int y, int z, short[] rgBa) {
+        if (player instanceof EntityPlayerMP) { // just in case
+            StructureLib.net.sendTo(
+                    new UpdateHintParticleMessage(x, (short) y, z, rgBa[0], rgBa[1], rgBa[2], rgBa[3]),
+                    (EntityPlayerMP) player);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public EntityPlayer getCurrentPlayer() {
+        return null;
+    }
+
+    public boolean isCurrentPlayer(EntityPlayer player) {
+        return false;
+    }
+
+    public void addClientSideChatMessages(String... messages) {}
+
+    public void startHinting(World w) {}
+
+    public void endHinting(World w) {}
+
+    public void preInit(FMLPreInitializationEvent e) {}
+
+    public long getOverworldTime() {
+        return MinecraftServer.getServer().getEntityWorld().getTotalWorldTime();
+    }
+
+    public void uploadChannels(ItemStack trigger) {}
+
+    public boolean markHintParticleError(EntityPlayer player, World w, int x, int y, int z) {
+        if (player instanceof EntityPlayerMP) { // just in case
+            StructureLib.net.sendTo(new ErrorHintParticleMessage(x, (short) y, z), (EntityPlayerMP) player);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public void loadComplete(FMLLoadCompleteEvent e) {
+        ConfigurationHandler.INSTANCE.loadRegistryOrder();
+    }
+
+    private final Map<EntityPlayerMP, Map<Object, Long>> throttleMap = new WeakHashMap<>();
+
+    public void addThrottledChat(Object throttleKey, EntityPlayer player, IChatComponent text, short intervalRequired,
+            boolean forceUpdateLastSend) {
+        if (player instanceof EntityPlayerMP) {
+            Map<Object, Long> submap = throttleMap.computeIfAbsent((EntityPlayerMP) player, p -> new HashMap<>());
+            addThrottledChat(throttleKey, player, text, intervalRequired, forceUpdateLastSend, submap);
+        }
+    }
+
+    protected static void addThrottledChat(Object throttleKey, EntityPlayer player, IChatComponent text,
+            short intervalRequired, boolean forceUpdateLastSend, Map<Object, Long> submap) {
+        long now = System.currentTimeMillis();
+        Long old;
+        if (forceUpdateLastSend) {
+            old = submap.put(throttleKey, now);
+        } else {
+            old = submap.get(throttleKey);
+        }
+        if (old == null || now - old >= intervalRequired) {
+            player.addChatComponentMessage(text);
+            if (!forceUpdateLastSend) submap.put(throttleKey, now);
+        }
+    }
+
+    public void displayConfigGUI(String category) {}
+
+    public static class ForgeEventHandler {
+
+        private int ticksSinceLastPurge;
+
+        @SubscribeEvent
+        public void onServerTickEnd(TickEvent.ServerTickEvent e) {
+            if (e.phase != TickEvent.Phase.END) return;
+            if (++ticksSinceLastPurge < 20 * 60 * 10) return;
+            ticksSinceLastPurge = 0;
+            MinecraftServer server = MinecraftServer.getServer();
+            // it's hard to tell why server could be null in a server tick handler, but who knows?
+            if (server == null) return;
+            SortedRegistry.cleanup(server);
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/ConfigurationHandler.java

@@ -1,21 +1,39 @@
 package com.gtnewhorizon.structurelib;
 
-import cpw.mods.fml.client.event.ConfigChangedEvent;
+import java.io.File;
-import cpw.mods.fml.common.FMLCommonHandler;
+import java.lang.ref.WeakReference;
-import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 import net.minecraftforge.common.config.ConfigCategory;
 import net.minecraftforge.common.config.Configuration;
 import net.minecraftforge.common.config.Property;
 
-import java.io.File;
+import org.apache.commons.lang3.tuple.Pair;
-import java.util.Map;
+
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+
+import cpw.mods.fml.client.event.ConfigChangedEvent;
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.relauncher.FMLLaunchHandler;
 
 public enum ConfigurationHandler {
+
     INSTANCE;
 
     private Configuration config;
     private int maxCoexistingHologram;
     private boolean removeCollidingHologram;
+    private int hintLifespan;
+    private int hintTransparency;
+    private int autoPlaceBudget;
+    private int autoPlaceInterval;
+    private Map<String, Pair<List<String>, List<String>>> registryOrders;
 
     ConfigurationHandler() {
         FMLCommonHandler.instance().bus().register(this);
@@ -39,11 +57,91 @@ public enum ConfigurationHandler {
     }
 
     private void loadConfig() {
-        maxCoexistingHologram = config.getInt("maxCoexisting", "client.hologram", 1, 1, 100, "An attempt will be made to prune old holograms when a new hologram is about to be projected");
+        maxCoexistingHologram = config.getInt(
-        removeCollidingHologram = config.getBoolean("removeColliding", "client.hologram", true, "An attempt will be made to remove an existing hologram if it collides with a new hologram.");
+                "maxCoexisting",
+                "client.hologram",
+                1,
+                1,
+                100,
+                "An attempt will be made to prune old holograms when a new hologram is about to be projected");
+        removeCollidingHologram = config.getBoolean(
+                "removeColliding",
+                "client.hologram",
+                true,
+                "An attempt will be made to remove an existing hologram if it collides with a new hologram.");
+        hintLifespan = config
+                .getInt("hintLifespan", "client.hologram", 400, 1, 20000, "Ticks before a hologram disappears.");
+        hintTransparency = config.getInt(
+                "hintTransparency",
+                "client.hologram",
+                192,
+                1,
+                255,
+                "Alpha value of hologram particles. Higher the value, the more \"ghostly\" the hologram will appear to be.");
+        autoPlaceBudget = config.getInt(
+                "autoPlaceBudget",
+                "common.hologram",
+                25,
+                1,
+                200,
+                "Max number of elements can be placed in one round of auto place.\n"
+                        + "As expected, server side settings will overrides client settings.\n"
+                        + "Certain larger multi might increase these values beyond this configured value.");
+        autoPlaceInterval = config.getInt(
+                "autoPlaceInterval",
+                "common.hologram",
+                300,
+                0,
+                20000,
+                "Unit: millisecond. Minimal interval between two auto place round.\n"
+                        + "As expected, server side settings will overrides client settings.\n"
+                        + "Note this relates to the wall clock, not in game ticks.\n"
+                        + "Value smaller than default is likely to be perceived as no minimal interval whatsoever.");
 
+        loadRegistryOrder();
+
+        saveConfig();
+    }
+
+    void loadRegistryOrder() {
+        loadRegistryOrderImpl();
+        setLanguageKeys();
+        saveConfig();
+    }
+
+    private void loadRegistryOrderImpl() {
+        registryOrders = new HashMap<>();
+        for (Map.Entry<String, WeakReference<SortedRegistry<?>>> e : SortedRegistry.ALL_REGISTRIES.entrySet()) {
+            SortedRegistry<?> r = e.getValue().get();
+            if (r == null) continue;
+            String category = "registries." + e.getKey();
+            if (FMLLaunchHandler.side().isClient()) {
+                // only meaningful on client, and would crash on server
+                config.setCategoryConfigEntryClass(category, RegistryOrderEntry.class);
+            }
+            Property pOrder = config.get(
+                    category,
+                    "ordering",
+                    Iterables.toArray(r.getCurrentOrdering(), String.class),
+                    "stuff not in this list will be automatically available after all entries listed here in their natural order, unless explicitly disabled in disabled config below.");
+            Property pDisable = config.get(category, "disabled", new String[0], "stuff in this list will be disabled");
+            List<String> all = Lists.newArrayList(r.getCurrentOrdering());
+            List<String> curVal = new ArrayList<>(Arrays.asList(pOrder.getStringList()));
+            List<String> disabled = new ArrayList<>(Arrays.asList(pDisable.getStringList()));
+            curVal.removeAll(disabled);
+            all.removeAll(disabled);
+            curVal.removeIf(s -> !all.remove(s));
+            curVal.addAll(all);
+            pOrder.set(curVal.toArray(new String[0]));
+            registryOrders.put(e.getKey(), Pair.of(curVal, disabled));
+        }
+        saveConfig();
+    }
+
+    private void saveConfig() {
         if (config.hasChanged()) {
             config.save();
+            config.load();
         }
     }
 
@@ -62,7 +160,28 @@ public enum ConfigurationHandler {
         return removeCollidingHologram;
     }
 
+    public int getHintLifespan() {
+        return hintLifespan;
+    }
+
+    public int getHintTransparency() {
+        return hintTransparency;
+    }
+
+    public int getAutoPlaceBudget() {
+        return autoPlaceBudget;
+    }
+
+    public int getAutoPlaceInterval() {
+        return autoPlaceInterval;
+    }
+
+    public Pair<List<String>, List<String>> getRegistryOrder(String name) {
+        return registryOrders.get(name);
+    }
+
     Configuration getConfig() {
         return config;
     }
+
 }

src/main/java/com/gtnewhorizon/structurelib/ConfigurationVersion.java

@@ -1,16 +1,18 @@
 package com.gtnewhorizon.structurelib;
 
-import net.minecraftforge.common.config.Configuration;
-
-import javax.annotation.Nullable;
 import java.util.Arrays;
 import java.util.Objects;
 
+import javax.annotation.Nullable;
+
+import net.minecraftforge.common.config.Configuration;
+
 enum ConfigurationVersion {
+
     V1 {
+
         @Override
-        protected void step(Configuration c) {
+        protected void step(Configuration c) {}
-        }
     };
 
     private static final ConfigurationVersion[] VALUES = values();
@@ -32,7 +34,8 @@ enum ConfigurationVersion {
     }
 
     public static ConfigurationVersion identify(Configuration c) {
-        return Arrays.stream(VALUES).filter(v -> Objects.equals(c.getLoadedConfigVersion(), v.getVersionMarker())).findFirst().orElse(V1);
+        return Arrays.stream(VALUES).filter(v -> Objects.equals(c.getLoadedConfigVersion(), v.getVersionMarker()))
+                .findFirst().orElse(V1);
     }
 
     @Nullable

src/main/java/com/gtnewhorizon/structurelib/DevelopHelper.java

@@ -0,0 +1,48 @@
+package com.gtnewhorizon.structurelib;
+
+import net.minecraft.init.Blocks;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
+
+import cpw.mods.fml.common.event.FMLInterModComms;
+
+public class DevelopHelper {
+
+    private static final boolean DEBUG = Boolean.getBoolean("structurelib.develop_helper");
+
+    public static void onPreInit() {
+        if (!DEBUG) return;
+        StructureLib.LOGGER.info("Running develop helper");
+        StructureLibAPI.registerChannelDescription("sandstone", StructureLibAPI.MOD_ID, "variants of Sandstone");
+        StructureLibAPI.registerChannelItem("sandstone", StructureLibAPI.MOD_ID, 1, new ItemStack(Blocks.sandstone));
+        StructureLibAPI
+                .registerChannelItem("sandstone", StructureLibAPI.MOD_ID, 2, new ItemStack(Blocks.sandstone, 1, 1));
+        StructureLibAPI
+                .registerChannelItem("sandstone", StructureLibAPI.MOD_ID, 3, new ItemStack(Blocks.sandstone, 1, 2));
+        StructureLibAPI.registerChannelDescription("sandbricks", StructureLibAPI.MOD_ID, "variants of Sandbricks");
+        StructureLibAPI.registerChannelDescription("apple", StructureLibAPI.MOD_ID, "apple");
+        StructureLibAPI.registerChannelDescription("bright", StructureLibAPI.MOD_ID, "bright");
+        StructureLibAPI.registerChannelDescription("apple_blight", StructureLibAPI.MOD_ID, "apple_blight");
+        StructureLibAPI.registerChannelDescription("app_eagle", StructureLibAPI.MOD_ID, "app_eagle");
+    }
+
+    public void x() {
+        NBTTagCompound command = new NBTTagCompound();
+        NBTTagList items = new NBTTagList();
+        int[] metas = { 0, 1, 2 };
+        for (int meta : metas) {
+            NBTTagCompound tag = new NBTTagCompound();
+            tag.setTag("Item", new ItemStack(Blocks.sandstone, 1, meta).writeToNBT(new NBTTagCompound()));
+            NBTTagList channels = new NBTTagList();
+            NBTTagCompound channel = new NBTTagCompound();
+            channel.setString("Channel", "sandstone");
+            channel.setInteger("Value", meta + 1);
+            channels.appendTag(channel);
+            tag.setTag("Channels", channels);
+            items.appendTag(tag);
+        }
+        command.setTag("Items", items);
+        FMLInterModComms.sendMessage("structurelib", "register_channel_item", command);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/GuiEditRegistryConfig.java

@@ -0,0 +1,695 @@
+/*
+ * Forge Mod Loader Copyright (c) 2012-2014 cpw. All rights reserved. This program and the accompanying materials are
+ * made available under the terms of the GNU Lesser Public License v2.1 which accompanies this distribution, and is
+ * available at http://www.gnu.org/licenses/old-licenses/gpl-2.0.html Contributors (this class): bspkrs - implementation
+ */
+
+package com.gtnewhorizon.structurelib;
+
+import static cpw.mods.fml.client.config.GuiUtils.RESET_CHAR;
+import static cpw.mods.fml.client.config.GuiUtils.UNDO_CHAR;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.WeakHashMap;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiListExtended;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.ScaledResolution;
+import net.minecraft.client.renderer.OpenGlHelper;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.MathHelper;
+import net.minecraft.util.ResourceLocation;
+
+import org.lwjgl.input.Keyboard;
+import org.lwjgl.opengl.GL11;
+
+import cpw.mods.fml.client.config.GuiButtonExt;
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.config.GuiUnicodeGlyphButton;
+import cpw.mods.fml.client.config.GuiUtils;
+import cpw.mods.fml.client.config.HoverChecker;
+import cpw.mods.fml.client.config.IConfigElement;
+import cpw.mods.fml.client.event.ConfigChangedEvent;
+import cpw.mods.fml.client.event.ConfigChangedEvent.OnConfigChangedEvent;
+import cpw.mods.fml.client.event.ConfigChangedEvent.PostConfigChangedEvent;
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.Loader;
+import cpw.mods.fml.common.eventhandler.Event.Result;
+
+/**
+ * This class is the base GuiScreen for all config GUI screens. It can be extended by mods to provide the top-level
+ * config screen that will be called when the Config button is clicked from the Main Menu Mods list.
+ *
+ * @author bspkrs
+ */
+public class GuiEditRegistryConfig extends GuiScreen {
+
+    public static final String OMITTED = "..";
+    public static final int LIST_WINDOW_PADDING = 20;
+    public static final int MID_SECTION_WIDTH = 10;
+    /**
+     * A reference to the screen object that created this. Used for navigating between screens.
+     */
+    public final GuiScreen parentScreen;
+    private final IConfigElement<String> disabledElement;
+    private final String[] beforeDisabledValue;
+    private final IConfigElement<String> orderElement;
+    private final String[] beforeOrderValue;
+    final Collection<EntriesList> lists;
+    private final String registryName;
+    EntriesList disabledEntries;
+    EntriesList orderEntries;
+    public String title = "Config GUI";
+    public String titleLine2;
+    private GuiButtonExt btnDefault;
+    private GuiButtonExt btnUndoAll;
+    public final String modID;
+    /**
+     * When set to a non-null value the OnConfigChanged and PostConfigChanged events will be posted when the Done button
+     * is pressed if any configElements were changed (includes child screens). If not defined, the events will be posted
+     * if the parent gui is null or if the parent gui is not an instance of GuiConfig.
+     */
+    public final String configID;
+    public final boolean isWorldRunning;
+    public final boolean allRequireWorldRestart;
+    public final boolean allRequireMcRestart;
+    public boolean needsRefresh = true;
+    private HoverChecker undoHoverChecker;
+    private HoverChecker resetHoverChecker;
+
+    @SuppressWarnings({ "rawtypes", "unchecked" })
+    public GuiEditRegistryConfig(GuiScreen parentScreen, IConfigElement disabled, IConfigElement order,
+            String registryName, String modID, String configID, boolean allRequireWorldRestart,
+            boolean allRequireMcRestart, String title, String titleLine2) {
+        this.mc = parentScreen.mc;
+        this.lists = Collections.newSetFromMap(new WeakHashMap<>());
+        this.disabledElement = disabled;
+        this.beforeDisabledValue = (String[]) this.disabledElement.getList();
+        this.orderElement = order;
+        this.beforeOrderValue = (String[]) this.orderElement.getList();
+        this.parentScreen = parentScreen;
+        this.allRequireWorldRestart = allRequireWorldRestart;
+        this.allRequireMcRestart = allRequireMcRestart;
+        this.registryName = registryName;
+        this.modID = modID;
+        this.configID = configID;
+        this.isWorldRunning = mc.theWorld != null;
+        if (title != null) this.title = title;
+        this.titleLine2 = titleLine2;
+        if (this.titleLine2 != null && this.titleLine2.startsWith(" > "))
+            this.titleLine2 = this.titleLine2.replaceFirst(" > ", "");
+    }
+
+    /**
+     * Adds the buttons (and other controls) to the screen in question.
+     */
+    @Override
+    public void initGui() {
+        Keyboard.enableRepeatEvents(true);
+        if (this.disabledEntries == null || this.needsRefresh) {
+            this.disabledEntries = new EntriesList(
+                    (width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING,
+                    LIST_WINDOW_PADDING,
+                    I18n.format("structurelib.configgui.disabled"));
+            this.disabledEntries.initEntries(Arrays.asList(disabledElement.getList()));
+        } else {
+            this.disabledEntries.reinit((width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING, LIST_WINDOW_PADDING);
+        }
+        if (this.orderEntries == null || this.needsRefresh) {
+            this.orderEntries = new EntriesList(
+                    (width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING,
+                    (width + MID_SECTION_WIDTH) / 2,
+                    I18n.format("structurelib.configgui.enabled"));
+            this.orderEntries.initEntries(Arrays.asList(orderElement.getList()));
+        } else {
+            this.orderEntries
+                    .reinit((width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING, (width + MID_SECTION_WIDTH) / 2);
+        }
+        this.needsRefresh = false;
+
+        int undoGlyphWidth = mc.fontRenderer.getStringWidth(UNDO_CHAR) * 2;
+        int resetGlyphWidth = mc.fontRenderer.getStringWidth(RESET_CHAR) * 2;
+        int doneWidth = Math.max(mc.fontRenderer.getStringWidth(I18n.format("gui.done")) + 20, 100);
+        int undoWidth = mc.fontRenderer.getStringWidth(" " + I18n.format("fml.configgui.tooltip.undoChanges"))
+                + undoGlyphWidth
+                + 20;
+        int resetWidth = mc.fontRenderer.getStringWidth(" " + I18n.format("fml.configgui.tooltip.resetToDefault"))
+                + resetGlyphWidth
+                + 20;
+        int buttonWidthHalf = (doneWidth + 5 + undoWidth + 5 + resetWidth + 5) / 2;
+        this.buttonList.add(
+                new GuiButtonExt(
+                        2000,
+                        this.width / 2 - buttonWidthHalf,
+                        this.height - 29,
+                        doneWidth,
+                        20,
+                        I18n.format("gui.done")));
+        this.buttonList.add(
+                this.btnDefault = new GuiUnicodeGlyphButton(
+                        2001,
+                        this.width / 2 - buttonWidthHalf + doneWidth + 5 + undoWidth + 5,
+                        this.height - 29,
+                        resetWidth,
+                        20,
+                        " " + I18n.format("fml.configgui.tooltip.resetToDefault"),
+                        RESET_CHAR,
+                        2.0F));
+        this.buttonList.add(
+                btnUndoAll = new GuiUnicodeGlyphButton(
+                        2002,
+                        this.width / 2 - buttonWidthHalf + doneWidth + 5,
+                        this.height - 29,
+                        undoWidth,
+                        20,
+                        " " + I18n.format("fml.configgui.tooltip.undoChanges"),
+                        UNDO_CHAR,
+                        2.0F));
+
+        this.undoHoverChecker = new HoverChecker(this.btnUndoAll, 800);
+        this.resetHoverChecker = new HoverChecker(this.btnDefault, 800);
+    }
+
+    /**
+     * Called when the screen is unloaded. Used to disable keyboard repeat events
+     */
+    @Override
+    public void onGuiClosed() {
+        if (this.configID != null && this.parentScreen instanceof GuiConfig parentGuiConfig) {
+            parentGuiConfig.needsRefresh = true;
+            parentGuiConfig.initGui();
+        }
+
+        if (!(this.parentScreen instanceof GuiConfig)) Keyboard.enableRepeatEvents(false);
+    }
+
+    public boolean saveConfigElements() {
+        if (isChanged()) {
+            disabledElement.set(disabledEntries.entries.stream().map(e -> e.name).toArray(String[]::new));
+            orderElement.set(orderEntries.entries.stream().map(e -> e.name).toArray(String[]::new));
+        }
+        return false;
+    }
+
+    @Override
+    protected void actionPerformed(GuiButton button) {
+        if (button.id == 2000) {
+            try {
+                if ((configID != null || this.parentScreen == null || !(this.parentScreen instanceof GuiConfig))
+                        && isChanged()) {
+                    saveConfigElements();
+                    if (Loader.isModLoaded(modID)) {
+                        ConfigChangedEvent event = new OnConfigChangedEvent(modID, configID, isWorldRunning, false);
+                        FMLCommonHandler.instance().bus().post(event);
+                        if (!event.getResult().equals(Result.DENY)) FMLCommonHandler.instance().bus()
+                                .post(new PostConfigChangedEvent(modID, configID, isWorldRunning, false));
+
+                        if (this.parentScreen instanceof GuiConfig) ((GuiConfig) this.parentScreen).needsRefresh = true;
+                    }
+                }
+            } catch (Throwable e) {
+                e.printStackTrace();
+            }
+
+            this.mc.displayGuiScreen(this.parentScreen);
+        } else if (button.id == 2001) {
+            setToDefault();
+        } else if (button.id == 2002) {
+            undoChanges();
+        }
+    }
+
+    public boolean isInitialized() {
+        return disabledEntries != null && orderEntries != null;
+    }
+
+    public void undoChanges() {
+        disabledEntries.initEntries(Arrays.asList(beforeDisabledValue));
+        orderEntries.initEntries(Arrays.asList(beforeOrderValue));
+    }
+
+    public void setToDefault() {
+        disabledEntries.initEntries(Arrays.asList(disabledElement.getList()));
+        orderEntries.initEntries(Arrays.asList(orderElement.getList()));
+    }
+
+    public boolean isDefault() {
+        return !orderEntries.areContentEqual(orderElement.getDefaults())
+                || !disabledEntries.areContentEqual(disabledElement.getDefaults());
+    }
+
+    public boolean isChanged() {
+        return !orderEntries.areContentEqual(beforeOrderValue) || !disabledEntries.areContentEqual(beforeDisabledValue);
+    }
+
+    /**
+     * Called when the mouse is clicked.
+     */
+    @Override
+    protected void mouseClicked(int x, int y, int mouseEvent) {
+        if (mouseEvent != 0 || !this.disabledEntries.func_148179_a(x, y, mouseEvent)
+                && !this.orderEntries.func_148179_a(x, y, mouseEvent)) {
+            super.mouseClicked(x, y, mouseEvent);
+        }
+    }
+
+    /**
+     * Called when the mouse is moved or a mouse button is released. Signature: (mouseX, mouseY, which) which==-1 is
+     * mouseMove, which==0 or which==1 is mouseUp
+     */
+    @Override
+    protected void mouseMovedOrUp(int x, int y, int mouseEvent) {
+        if (mouseEvent != 0 || !this.disabledEntries.func_148181_b(x, y, mouseEvent)
+                && !this.orderEntries.func_148181_b(x, y, mouseEvent)) {
+            super.mouseMovedOrUp(x, y, mouseEvent);
+        }
+    }
+
+    /**
+     * Fired when a key is typed. This is the equivalent of KeyListener.keyTyped(KeyEvent e).
+     */
+    @Override
+    protected void keyTyped(char eventChar, int eventKey) {
+        if (eventKey == Keyboard.KEY_ESCAPE) this.mc.displayGuiScreen(parentScreen);
+    }
+
+    String trimStringToWidth(String str, int width) {
+        int strwidth = mc.fontRenderer.getStringWidth(str);
+        int elipsisWidth = mc.fontRenderer.getStringWidth(OMITTED);
+        if (strwidth > width - elipsisWidth && elipsisWidth > strwidth) {
+            return mc.fontRenderer.trimStringToWidth(str, width - elipsisWidth).trim() + OMITTED;
+        }
+        return str;
+    }
+
+    /**
+     * Draws the screen and all the components in it.
+     */
+    @Override
+    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+        for (EntriesList list : lists) {
+            list.handleDrag(mouseX, mouseY, partialTicks);
+        }
+        this.drawDefaultBackground();
+        for (EntriesList list : lists) {
+            list.drawScreen(mouseX, mouseY, partialTicks);
+        }
+        this.drawCenteredString(this.fontRendererObj, this.title, this.width / 2, 8, 16777215);
+        String title2 = this.titleLine2;
+
+        if (title2 != null) {
+            title2 = trimStringToWidth(title2, width - 6);
+            this.drawCenteredString(this.fontRendererObj, title2, this.width / 2, 18, 16777215);
+        }
+
+        this.btnUndoAll.enabled = isChanged();
+        this.btnDefault.enabled = isDefault();
+        super.drawScreen(mouseX, mouseY, partialTicks);
+        for (EntriesList list : lists) {
+            list.drawScreenPost(mouseX, mouseY, partialTicks);
+        }
+        if (this.undoHoverChecker.checkHover(mouseX, mouseY)) this.func_146283_a(
+                this.mc.fontRenderer.listFormattedStringToWidth(I18n.format("fml.configgui.tooltip.undoAll"), 300),
+                mouseX,
+                mouseY);
+        if (this.resetHoverChecker.checkHover(mouseX, mouseY)) this.func_146283_a(
+                this.mc.fontRenderer.listFormattedStringToWidth(I18n.format("fml.configgui.tooltip.resetAll"), 300),
+                mouseX,
+                mouseY);
+    }
+
+    private class EntriesList extends GuiListExtended {
+
+        final String heading;
+        final List<ListEntry> entries = new ArrayList<>();
+        int controlX;
+
+        public EntriesList(int width, int left, String heading) {
+            super(
+                    mc,
+                    width,
+                    GuiEditRegistryConfig.this.height,
+                    titleLine2 != null ? 33 : 23,
+                    GuiEditRegistryConfig.this.height - 32,
+                    20);
+            this.heading = heading;
+            if (heading != null) {
+                setHasListHeader(true, mc.fontRenderer.FONT_HEIGHT + 4);
+            }
+            setSlotXBoundsFromLeft(left);
+            this.controlX = this.getScrollBarX() - 20;
+            lists.add(this);
+        }
+
+        @Override
+        public void drawScreen(int p_148128_1_, int p_148128_2_, float p_148128_3_) {
+            GL11.glEnable(GL11.GL_SCISSOR_TEST);
+            ScaledResolution scaledresolution = new ScaledResolution(mc, mc.displayWidth, mc.displayHeight);
+            GL11.glScissor(
+                    (left - 4) * scaledresolution.getScaleFactor(),
+                    (int) ((scaledresolution.getScaledHeight_double() - (bottom + 4))
+                            * scaledresolution.getScaleFactor()),
+                    (width + 8) * scaledresolution.getScaleFactor(),
+                    (height + 8) * scaledresolution.getScaleFactor());
+            super.drawScreen(p_148128_1_, p_148128_2_, p_148128_3_);
+            GL11.glDisable(GL11.GL_SCISSOR_TEST);
+        }
+
+        @Override
+        public void overlayBackground(int p_148136_1_, int p_148136_2_, int p_148136_3_, int p_148136_4_) {}
+
+        @Override
+        protected void drawContainerBackground(Tessellator tessellator) {
+            GL11.glEnable(GL11.GL_BLEND);
+            OpenGlHelper.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA, 0, 1);
+            GL11.glDisable(GL11.GL_ALPHA_TEST);
+            GL11.glShadeModel(GL11.GL_SMOOTH);
+            GL11.glDisable(GL11.GL_TEXTURE_2D);
+            tessellator.startDrawingQuads();
+            tessellator.setColorRGBA_I(0, 64);
+            tessellator.addVertex(left, bottom, 0);
+            tessellator.addVertex(right, bottom, 0);
+            tessellator.addVertex(right, top, 0);
+            tessellator.addVertex(left, top, 0);
+            tessellator.draw();
+            GL11.glEnable(GL11.GL_TEXTURE_2D);
+            GL11.glShadeModel(GL11.GL_FLAT);
+            GL11.glEnable(GL11.GL_ALPHA_TEST);
+            GL11.glDisable(GL11.GL_BLEND);
+        }
+
+        @Override
+        protected void drawListHeader(int p_148129_1_, int p_148129_2_, Tessellator p_148129_3_) {
+            if (heading == null) {
+                return;
+            }
+            FontRenderer fr = mc.fontRenderer;
+            fr.drawString(
+                    this.heading,
+                    p_148129_1_ + this.width / 2 - fr.getStringWidth(this.heading) / 2,
+                    Math.min(this.top + 3, p_148129_2_),
+                    0xffffff);
+        }
+
+        void reinit(int width, int left) {
+            this.width = width;
+            this.bottom = GuiEditRegistryConfig.this.height - 32;
+            this.setSlotXBoundsFromLeft(left);
+            this.controlX = this.getScrollBarX() - 20;
+        }
+
+        void initEntries(Iterable<?> entries) {
+            this.controlX = this.getScrollBarX() - 20;
+            this.entries.clear();
+            for (Object entry : entries) {
+                addEntry(new ListEntry(entry.toString()));
+            }
+        }
+
+        void addEntry(ListEntry entry) {
+            entry.entriesList = this;
+            this.entries.add(entry);
+            this.controlX = Math.min(this.controlX, this.getScrollBarX() - entry.getControlSetWidth() - 2);
+        }
+
+        @Override
+        public IGuiListEntry getListEntry(int i) {
+            return entries.get(i);
+        }
+
+        @Override
+        protected int getSize() {
+            return entries.size();
+        }
+
+        int getLabelX() {
+            return left + 2;
+        }
+
+        int getControlX() {
+            return controlX;
+        }
+
+        @Override
+        public int getListWidth() {
+            return width;
+        }
+
+        @Override
+        protected int getScrollBarX() {
+            return left + getListWidth() - 6;
+        }
+
+        public void handleDrag(int mouseX, int mouseY, float partialTicks) {
+            for (int i = 0, entriesSize = entries.size(); i < entriesSize; i++) {
+                ListEntry entry = entries.get(i);
+                if (entry.handleDrag(i, mouseX, mouseY, partialTicks)) {
+                    return;
+                }
+            }
+        }
+
+        public void drawScreenPost(int mouseX, int mouseY, float partialTicks) {
+            for (ListEntry entry : entries) {
+                entry.drawToolTip(mouseX, mouseY);
+            }
+        }
+
+        public boolean areContentEqual(Object[] vals) {
+            if (vals.length != entries.size()) return false;
+            for (int i = 0; i < entries.size(); i++) {
+                ListEntry entry = entries.get(i);
+                if (!entry.name.equals(vals[i])) return false;
+            }
+            return true;
+        }
+    }
+
+    class ListEntry implements GuiListExtended.IGuiListEntry {
+
+        private EntriesList entriesList;
+        private final HoverChecker hoverCheckerText = new HoverChecker(0, 0, 0, 0, 0);
+        final String name;
+        final String localizedName;
+        private final String tooltip;
+        public boolean modified = false;
+
+        private final GuiButtonExt btnDrag = new GuiButtonDrag(1, 0, 0, 20, 20);
+        private final HoverChecker hoverCheckerBtnDrag = new HoverChecker(btnDrag, 800);
+        private boolean isDragging = false;
+        private long lastScroll = 0;
+
+        ListEntry(String name) {
+            this.name = name;
+            String nameKey = "structurelib.sortedregistry." + registryName + "." + name;
+            this.localizedName = trans(nameKey, name);
+
+            String tooltipKey = nameKey + ".tooltip";
+            String tooltip = trans(tooltipKey, null);
+            StringBuilder tooltipBuilder = new StringBuilder();
+            tooltipBuilder.append(EnumChatFormatting.GREEN);
+            tooltipBuilder.append(this.localizedName);
+            if (tooltip != null) {
+                tooltipBuilder.append('\n').append(EnumChatFormatting.YELLOW).append(tooltip);
+            }
+            tooltipBuilder.append('\n');
+            tooltipBuilder.append(EnumChatFormatting.DARK_GRAY);
+            tooltipBuilder.append(this.name);
+            this.tooltip = tooltipBuilder.toString();
+        }
+
+        @Override
+        public void drawEntry(int slotIndex, int x, int y, int listWidth, int slotHeight, Tessellator tessellator,
+                int mouseX, int mouseY, boolean isSelected) {
+            drawOutlineBox(x, y, listWidth, slotHeight, tessellator);
+            drawLabel(y, slotHeight);
+            drawControlSet(y, slotHeight, mouseX, mouseY);
+        }
+
+        private void drawOutlineBox(int x, int y, int listWidth, int slotHeight, Tessellator tessellator) {
+            if (isDragging) {
+                // left x, right x, top y, bottom y
+                int lx = x, rx = entriesList.getScrollBarX() - 4, ty = y, by = y + slotHeight;
+                GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
+                GL11.glDisable(GL11.GL_TEXTURE_2D);
+                tessellator.startDrawingQuads();
+                tessellator.setColorOpaque_I(0x808080);
+                tessellator.addVertexWithUV(lx - 4, by + 4, 0.0D, 0.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 4, by + 4, 0.0D, 1.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 4, ty - 4, 0.0D, 1.0D, 0.0D);
+                tessellator.addVertexWithUV(lx - 4, ty - 4, 0.0D, 0.0D, 0.0D);
+                tessellator.setColorOpaque_I(0x202020);
+                tessellator.addVertexWithUV(lx - 2, by + 2, 0.0D, 0.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 2, by + 2, 0.0D, 1.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 2, ty - 2, 0.0D, 1.0D, 0.0D);
+                tessellator.addVertexWithUV(lx - 2, ty - 2, 0.0D, 0.0D, 0.0D);
+                tessellator.draw();
+                GL11.glEnable(GL11.GL_TEXTURE_2D);
+            }
+        }
+
+        private void drawControlSet(int y, int slotHeight, int mouseX, int mouseY) {
+            btnDrag.xPosition = entriesList.getControlX();
+            btnDrag.yPosition = y + (slotHeight - btnDrag.height) / 2;
+            btnDrag.drawButton(mc, mouseX, mouseY);
+        }
+
+        private void drawLabel(int y, int slotHeight) {
+            String label = modified ? EnumChatFormatting.ITALIC + localizedName : localizedName;
+            int allowedWidth = entriesList.getControlX() - entriesList.getLabelX() - 4;
+            // probably not very wise to recompute this every render tick, but it doesn't matter for now
+            String toDraw = trimStringToWidth(label, allowedWidth);
+            hoverCheckerText.updateBounds(
+                    y + slotHeight / 2 - mc.fontRenderer.FONT_HEIGHT / 2,
+                    y + slotHeight / 2 + mc.fontRenderer.FONT_HEIGHT / 2,
+                    entriesList.getLabelX(),
+                    entriesList.getLabelX() + mc.fontRenderer.getStringWidth(toDraw));
+
+            mc.fontRenderer.drawString(
+                    toDraw,
+                    entriesList.getLabelX(),
+                    y + slotHeight / 2 - mc.fontRenderer.FONT_HEIGHT / 2,
+                    getLabelColor());
+        }
+
+        void drawToolTip(int mouseX, int mouseY) {
+            // ensure checkHover() is always called, or the hover threshold might fail under certain corner cases
+            if (hoverCheckerText.checkHover(mouseX, mouseY)) {
+                GuiEditRegistryConfig.this.func_146283_a(
+                        mc.fontRenderer.listFormattedStringToWidth(tooltip, entriesList.getListWidth()),
+                        mouseX,
+                        mouseY);
+            }
+            if (hoverCheckerBtnDrag.checkHover(mouseX, mouseY) && !isDragging) {
+                GuiEditRegistryConfig.this.func_146283_a(
+                        mc.fontRenderer.listFormattedStringToWidth(
+                                I18n.format("structurelib.configgui.drag.tooltip"),
+                                entriesList.getListWidth()),
+                        mouseX,
+                        mouseY);
+            }
+        }
+
+        protected int getLabelColor() {
+            return isDragging ? 0x888888 : 0xffffff;
+        }
+
+        int getControlSetWidth() {
+            return this.btnDrag.getButtonWidth();
+        }
+
+        public boolean handleDrag(int index, int mouseX, int mouseY, float partialTicks) {
+            if (!isDragging) {
+                return false;
+            }
+            for (EntriesList list : lists) {
+                if (list == entriesList) continue;
+                if (mouseX > list.left && mouseX < list.right && mouseY > list.top && mouseY < list.bottom) {
+                    int l;
+                    if (list.entries.isEmpty()) l = 0;
+                    else l = list.func_148124_c(mouseX, mouseY);
+                    if (l < 0) {
+                        if (mouseY < (list.bottom + list.top) / 2) {
+                            l = 0;
+                        } else {
+                            l = list.entries.size();
+                        }
+                    }
+                    entriesList.func_148143_b(true);
+                    entriesList.entries.remove(index);
+                    list.func_148143_b(false);
+                    list.entries.add(l, this);
+                    this.entriesList = list;
+                    return true;
+                }
+            }
+            long now = System.currentTimeMillis();
+            if (now - lastScroll > 20) {
+                if (mouseY < entriesList.top) {
+                    entriesList.scrollBy(-3);
+                    lastScroll = now;
+                } else if (mouseY > entriesList.bottom) {
+                    entriesList.scrollBy(3);
+                    lastScroll = now;
+                }
+            }
+            int l = entriesList.func_148124_c(
+                    MathHelper.clamp_int(mouseX, entriesList.left, entriesList.right),
+                    MathHelper.clamp_int(mouseY, entriesList.top, entriesList.bottom));
+            if (l < 0 || l == index) return true;
+            entriesList.entries.remove(index);
+            entriesList.entries.add(l, this);
+            return true;
+        }
+
+        @Override
+        public void mouseReleased(int index, int x, int y, int mouseEvent, int relativeX, int relativeY) {
+            isDragging = false;
+        }
+
+        @Override
+        public boolean mousePressed(int index, int x, int y, int mouseEvent, int relativeX, int relativeY) {
+            if (btnDrag.mousePressed(mc, x, y)) {
+                isDragging = true;
+                return true;
+            }
+            return false;
+        }
+    }
+
+    private static String trans(String transKey, String fallback) {
+        String translated = I18n.format(transKey);
+        return translated.equals(transKey) ? fallback : translated;
+    }
+
+    private static class GuiButtonDrag extends GuiButtonExt {
+
+        public GuiButtonDrag(int id, int xPos, int yPos, int width, int height) {
+            super(id, xPos, yPos, width, height, null);
+        }
+
+        @Override
+        public void drawButton(Minecraft mc, int mouseX, int mouseY) {
+            if (this.visible) {
+                this.field_146123_n = mouseX >= this.xPosition && mouseY >= this.yPosition
+                        && mouseX < this.xPosition + this.width
+                        && mouseY < this.yPosition + this.height;
+                int k = this.getHoverState(this.field_146123_n);
+                GuiUtils.drawContinuousTexturedBox(
+                        buttonTextures,
+                        this.xPosition,
+                        this.yPosition,
+                        0,
+                        46 + k * 20,
+                        this.width,
+                        this.height,
+                        200,
+                        20,
+                        2,
+                        3,
+                        2,
+                        2,
+                        this.zLevel);
+                mc.renderEngine.bindTexture(new ResourceLocation("structurelib", "textures/gui/fourwayarrow2.png"));
+                int x = this.xPosition + (this.width - 12) / 2;
+                int y = this.yPosition + (this.height - 12) / 2;
+                Tessellator tessellator = Tessellator.instance;
+                tessellator.startDrawingQuads();
+                tessellator.addVertexWithUV(x, y + 12, zLevel, 0, 1);
+                tessellator.addVertexWithUV(x + 12, y + 12, zLevel, 1, 1);
+                tessellator.addVertexWithUV(x + 12, y, zLevel, 1, 0);
+                tessellator.addVertexWithUV(x, y, zLevel, 0, 0);
+                tessellator.draw();
+            }
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/GuiFactory.java

@@ -1,15 +1,16 @@
 package com.gtnewhorizon.structurelib;
 
-import cpw.mods.fml.client.IModGuiFactory;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.GuiScreen;
-
 import java.util.Set;
 
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiScreen;
+
+import cpw.mods.fml.client.IModGuiFactory;
+
 public class GuiFactory implements IModGuiFactory {
+
     @Override
-    public void initialize(Minecraft minecraftInstance) {
+    public void initialize(Minecraft minecraftInstance) {}
-    }
 
     @Override
     public Class<? extends GuiScreen> mainConfigGuiClass() {
@@ -25,4 +26,4 @@ public class GuiFactory implements IModGuiFactory {
     public RuntimeOptionGuiHandler getHandlerFor(RuntimeOptionCategoryElement element) {
         return null;
     }
-}
+}

src/main/java/com/gtnewhorizon/structurelib/GuiHandler.java

@@ -0,0 +1,32 @@
+package com.gtnewhorizon.structurelib;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.world.World;
+
+import com.gtnewhorizon.structurelib.gui.EmptyContainer;
+import com.gtnewhorizon.structurelib.gui.GuiScreenConfigureChannels;
+
+import cpw.mods.fml.common.network.IGuiHandler;
+
+public class GuiHandler implements IGuiHandler {
+
+    @Override
+    public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
+        switch (ID) {
+            case 0:
+                return new EmptyContainer(player);
+            default:
+                return null;
+        }
+    }
+
+    @Override
+    public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
+        switch (ID) {
+            case 0:
+                return new GuiScreenConfigureChannels(new EmptyContainer(player), player.inventory.getStackInSlot(x));
+            default:
+                return null;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/GuiModConfig.java

@@ -1,25 +1,31 @@
 package com.gtnewhorizon.structurelib;
 
-import cpw.mods.fml.client.config.GuiConfig;
-import cpw.mods.fml.client.config.IConfigElement;
-import net.minecraft.client.gui.GuiScreen;
-import net.minecraftforge.common.config.ConfigElement;
-import net.minecraftforge.common.config.Configuration;
-
 import java.util.List;
 import java.util.stream.Collectors;
 
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraftforge.common.config.ConfigElement;
+import net.minecraftforge.common.config.Configuration;
+
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.config.IConfigElement;
+
 public class GuiModConfig extends GuiConfig {
+
     public GuiModConfig(GuiScreen guiScreen) {
-        super(guiScreen, getConfigElements(), StructureLibAPI.MOD_ID, false, false, GuiConfig.getAbridgedConfigPath(ConfigurationHandler.INSTANCE.getConfig().toString()));
+        super(
+                guiScreen,
+                getConfigElements(),
+                StructureLibAPI.MOD_ID,
+                false,
+                false,
+                GuiConfig.getAbridgedConfigPath(ConfigurationHandler.INSTANCE.getConfig().toString()));
     }
 
     @SuppressWarnings("rawtypes")
     private static List<IConfigElement> getConfigElements() {
         final Configuration config = ConfigurationHandler.INSTANCE.getConfig();
-        return config.getCategoryNames().stream()
+        return config.getCategoryNames().stream().filter(name -> name.indexOf('.') == -1)
-                .filter(name -> name.indexOf('.') == -1)
+                .map(name -> new ConfigElement(config.getCategory(name))).collect(Collectors.toList());
-                .map(name -> new ConfigElement(config.getCategory(name)))
-                .collect(Collectors.toList());
     }
 }

src/main/java/com/gtnewhorizon/structurelib/IStructureCompat.java

@@ -0,0 +1,8 @@
+package com.gtnewhorizon.structurelib;
+
+import net.minecraft.util.IIcon;
+
+public interface IStructureCompat {
+
+    void markTextureUsed(IIcon o);
+}

src/main/java/com/gtnewhorizon/structurelib/RegistryOrderEntry.java

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib;
+
+import java.util.List;
+
+import net.minecraft.client.gui.GuiScreen;
+
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.config.GuiConfigEntries;
+import cpw.mods.fml.client.config.IConfigElement;
+
+@SuppressWarnings({ "unchecked" })
+public final class RegistryOrderEntry extends GuiConfigEntries.CategoryEntry {
+
+    public RegistryOrderEntry(GuiConfig owningScreen, GuiConfigEntries owningEntryList,
+            IConfigElement<?> configElement) {
+        super(owningScreen, owningEntryList, configElement);
+    }
+
+    @Override
+    protected GuiScreen buildChildScreen() {
+        List<IConfigElement<?>> childElements = this.configElement.getChildElements();
+        IConfigElement<?> disabled = null, order = null;
+        for (IConfigElement<?> e : childElements) {
+            if (e.getName().equals("disabled")) disabled = e;
+            else if (e.getName().equals("ordering")) order = e;
+        }
+        if (disabled == null || order == null) {
+            throw new IllegalArgumentException("Did not find expected config entires");
+        }
+        return new GuiEditRegistryConfig(
+                this.owningScreen,
+                disabled,
+                order,
+                configElement.getName(),
+                this.owningScreen.modID,
+                null,
+                owningScreen.allRequireWorldRestart || this.configElement.requiresWorldRestart(),
+                owningScreen.allRequireMcRestart || this.configElement.requiresMcRestart(),
+                this.owningScreen.title,
+                ((this.owningScreen.titleLine2 == null ? "" : this.owningScreen.titleLine2) + " > " + this.name));
+    }
+
+    private GuiEditRegistryConfig getChildScreen() {
+        return (GuiEditRegistryConfig) childScreen;
+    }
+
+    @Override
+    public boolean saveConfigElement() {
+        GuiEditRegistryConfig c = getChildScreen();
+        if (c != null && c.isInitialized()) return c.saveConfigElements();
+        return false;
+    }
+
+    @Override
+    public boolean isChanged() {
+        GuiEditRegistryConfig c = getChildScreen();
+        return c != null && c.isInitialized() && c.isChanged();
+    }
+
+    @Override
+    public boolean isDefault() {
+        GuiEditRegistryConfig c = getChildScreen();
+        return c != null && c.isInitialized() && c.isDefault();
+    }
+
+    @Override
+    public void setToDefault() {
+        GuiEditRegistryConfig c = getChildScreen();
+        if (c != null && c.isInitialized()) c.setToDefault();
+    }
+
+    @Override
+    public void undoChanges() {
+        GuiEditRegistryConfig c = getChildScreen();
+        if (c != null && c.isInitialized()) c.undoChanges();
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/SortedRegistry.java

@@ -0,0 +1,197 @@
+package com.gtnewhorizon.structurelib;
+
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.IdentityHashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.Set;
+import java.util.Spliterator;
+import java.util.TreeMap;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.server.MinecraftServer;
+
+import org.apache.commons.lang3.tuple.Pair;
+
+import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
+
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.common.gameevent.PlayerEvent;
+
+public class SortedRegistry<V> implements Iterable<V> {
+
+    static final ConcurrentHashMap<String, WeakReference<SortedRegistry<?>>> ALL_REGISTRIES = new ConcurrentHashMap<>();
+    static {
+        RegistryOrderSyncMessage.Handler.setAllRegistries(ALL_REGISTRIES);
+    }
+    private final NavigableMap<String, V> store = new TreeMap<>();
+    /**
+     * Store stuff in an array for faster iteration access than a red black tree
+     */
+    private List<V> baked = Collections.emptyList();
+
+    private final Map<UUID, Pair<List<String>, List<String>>> playerOrdering = new HashMap<>();
+    private final Map<UUID, List<V>> playerBaked = new HashMap<>();
+
+    /**
+     * Construct an unsynchronized registry
+     */
+    public SortedRegistry() {}
+
+    /**
+     * Construct a synchronized registry whose ordering will be synced to the server
+     *
+     * @param name network name
+     */
+
+    public SortedRegistry(String name) {
+        WeakReference<SortedRegistry<?>> oldValue = ALL_REGISTRIES.put(name, new WeakReference<>(this));
+        if (oldValue != null && oldValue.get() != null) {
+            throw new IllegalArgumentException("duplicate name");
+        }
+        FMLCommonHandler.instance().bus().register(this);
+    }
+
+    public static Set<String> getRegistryNames() {
+        return ALL_REGISTRIES.keySet();
+    }
+
+    public static SortedRegistry<?> getRegistry(String name) {
+        WeakReference<SortedRegistry<?>> ref = ALL_REGISTRIES.get(name);
+        return ref != null ? ref.get() : null;
+    }
+
+    static void cleanup(MinecraftServer server) {
+        List<EntityPlayerMP> players = server.getConfigurationManager().playerEntityList;
+        Set<UUID> onlinePlayerIDs = players.stream().map(EntityPlayerMP::getUniqueID).collect(Collectors.toSet());
+        int removed = 0;
+        for (WeakReference<SortedRegistry<?>> ref : ALL_REGISTRIES.values()) {
+            SortedRegistry<?> registry = ref.get();
+            if (registry == null) continue;
+            for (Iterator<UUID> iterator = registry.playerOrdering.keySet().iterator(); iterator.hasNext();) {
+                UUID uuid = iterator.next();
+                if (!onlinePlayerIDs.contains(uuid)) {
+                    iterator.remove();
+                    registry.playerBaked.remove(uuid);
+                    removed++;
+                }
+            }
+        }
+        if (removed > 0) {
+            StructureLib.LOGGER.debug("Removed {} registry record for logged out players", removed);
+        }
+    }
+
+    @SubscribeEvent
+    public void onPlayerLogOut(PlayerEvent.PlayerLoggedOutEvent e) {
+        playerOrdering.remove(e.player.getUniqueID());
+        playerBaked.remove(e.player.getUniqueID());
+    }
+
+    public void register(String key, V val) {
+        if (key == null || val == null) throw new NullPointerException();
+        V old = store.putIfAbsent(key, val);
+        if (old != null) {
+            throw new IllegalArgumentException("Duplicate key: " + key);
+        }
+        baked = new ArrayList<>(store.values());
+        for (Map.Entry<UUID, Pair<List<String>, List<String>>> e : playerOrdering.entrySet()) {
+            makePlayerBaked(e.getKey(), e.getValue().getKey(), e.getValue().getValue());
+        }
+    }
+
+    public void registerOrdering(EntityPlayerMP player, List<String> ordering, List<String> disabled) {
+        registerOrdering(player.getUniqueID(), ordering, disabled);
+    }
+
+    public void registerOrdering(UUID playerID, List<String> ordering, List<String> disabled) {
+        playerOrdering.put(playerID, Pair.of(ordering, disabled));
+        makePlayerBaked(playerID, ordering, disabled);
+    }
+
+    private void makePlayerBaked(UUID player, List<String> ordering, List<String> disabled) {
+        TreeMap<String, V> copy = new TreeMap<>(store);
+        for (String s : disabled) {
+            copy.remove(s);
+        }
+        List<V> b = new ArrayList<>();
+        for (String k : ordering) {
+            V v = copy.remove(k);
+            if (v != null) {
+                b.add(v);
+            }
+        }
+        b.addAll(copy.values());
+        playerBaked.put(player, b);
+    }
+
+    public int size() {
+        return store.size();
+    }
+
+    public boolean isEmpty() {
+        return store.isEmpty();
+    }
+
+    public boolean containsKey(String key) {
+        return store.containsKey(key);
+    }
+
+    public boolean containsValue(V value) {
+        return store.containsValue(value);
+    }
+
+    public V get(String key) {
+        return store.get(key);
+    }
+
+    public Iterable<V> getPlayerOrdering(@Nullable EntityPlayerMP player) {
+        if (player == null) return baked;
+        List<V> playerPreference = playerBaked.get(player.getUniqueID());
+        if (playerPreference == null) return baked;
+        return playerPreference;
+    }
+
+    public Stream<String> getPlayerOrderingKeys(@Nullable EntityPlayerMP player) {
+        if (player == null) return store.keySet().stream();
+        List<V> playerOrder = playerBaked.get(player.getUniqueID());
+        if (playerOrder == null) return store.keySet().stream();
+
+        // rebuild the order from the baked map
+        Map<V, String> reverseMap = new IdentityHashMap<>();
+        store.forEach((k, v) -> reverseMap.put(v, k));
+        return playerOrder.stream().map(reverseMap::get);
+    }
+
+    Iterable<String> getCurrentOrdering() {
+        return store.keySet();
+    }
+
+    @Override
+    public Iterator<V> iterator() {
+        return baked.iterator();
+    }
+
+    @Override
+    public void forEach(Consumer<? super V> action) {
+        baked.forEach(action);
+    }
+
+    @Override
+    public Spliterator<V> spliterator() {
+        return baked.spliterator();
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/StructureEvent.java

@@ -0,0 +1,160 @@
+package com.gtnewhorizon.structurelib;
+
+import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
+
+import com.gtnewhorizon.structurelib.structure.IStructureElement;
+
+import cpw.mods.fml.common.eventhandler.Event;
+
+/**
+ * Subscribers are <b>required</b> to not keep reference to these events, nor to depend on values of these events after
+ * the method call returns.
+ * <p>
+ * All of these events will be fired on the {@link net.minecraftforge.common.MinecraftForge#EVENT_BUS}, if they are
+ * enabled by {@link StructureLibAPI#enableInstrument(Object)}.
+ * <p>
+ * All public stuff in this class and its enclosed classes are considered part of the public API. Backwards
+ * compatibility is maintained to the maximum extend possible.
+ */
+public abstract class StructureEvent extends Event {
+
+    /*
+     * In case the event is passed to another thread for processing.
+     */
+    private final Object identifier = StructureLibAPI.instrument.get();
+
+    StructureEvent() {}
+
+    /**
+     * The instrument identifier. Subscribers should filter by these identifiers to prevent listening to a structure
+     * event for other people.
+     */
+    public Object getInstrumentIdentifier() {
+        return identifier;
+    }
+
+    /**
+     * Fired <b>just before</b> any structure element is visited.
+     */
+    public static final class StructureElementVisitedEvent extends StructureEvent {
+
+        private final World world;
+        private final int x, y, z;
+        private final int a, b, c;
+        private final IStructureElement<?> element;
+
+        /**
+         * Fire this event on {@link MinecraftForge#EVENT_BUS} by populating it with given arguments. Do nothing if
+         * instrumenting isn't enabled for current thread.
+         * <p>
+         * Any {@link Exception} thrown by event listeners will be logged and ignored. {@link Error} will be propagated
+         * as is.
+         */
+        public static void fireEvent(World world, int x, int y, int z, int a, int b, int c,
+                IStructureElement<?> element) {
+            if (StructureLibAPI.isInstrumentEnabled()) {
+                try {
+                    MinecraftForge.EVENT_BUS.post(new StructureElementVisitedEvent(world, x, y, z, a, b, c, element));
+                } catch (Exception e) {
+                    // logging is done by event bus, we just ignore the consequence here
+                }
+            }
+        }
+
+        StructureElementVisitedEvent(World world, int x, int y, int z, int a, int b, int c,
+                IStructureElement<?> element) {
+            this.world = world;
+            this.x = x;
+            this.y = y;
+            this.z = z;
+            this.a = a;
+            this.b = b;
+            this.c = c;
+            this.element = element;
+        }
+
+        /**
+         * A position in ABC coordinate, relative to (0,0,0) in the piece, i.e. without baseOffset
+         * <p>
+         * Submit a feature request if you need the baseOffset.
+         */
+        public int getA() {
+            return a;
+        }
+
+        /**
+         * B position in ABC coordinate, relative to (0,0,0) in the piece, i.e. without baseOffset
+         * <p>
+         * Submit a feature request if you need the baseOffset.
+         */
+        public int getB() {
+            return b;
+        }
+
+        /**
+         * C position in ABC coordinate, relative to (0,0,0) in the piece, i.e. without baseOffset
+         * <p>
+         * Submit a feature request if you need the baseOffset.
+         */
+        public int getC() {
+            return c;
+        }
+
+        /**
+         * Element being visited.
+         */
+        public IStructureElement<?> getElement() {
+            return element;
+        }
+
+        @Override
+        public String toString() {
+            return "StructureElementVisitedEvent{" + "a="
+                    + a
+                    + ", b="
+                    + b
+                    + ", c="
+                    + c
+                    + ", element="
+                    + element
+                    + ", world="
+                    + getWorld()
+                    + ", x="
+                    + getX()
+                    + ", y="
+                    + getY()
+                    + ", z="
+                    + getZ()
+                    + '}';
+        }
+
+        /**
+         * Location of this event.
+         */
+        public World getWorld() {
+            return world;
+        }
+
+        /**
+         * Location of this event. Absolute world coordinate.
+         */
+        public int getX() {
+            return x;
+        }
+
+        /**
+         * Location of this event. Absolute world coordinate.
+         */
+        public int getY() {
+            return y;
+        }
+
+        /**
+         * Location of this event. Absolute world coordinate.
+         */
+        public int getZ() {
+            return z;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/StructureLib.java

@@ -1,78 +1,207 @@
 package com.gtnewhorizon.structurelib;
 
-import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import static com.gtnewhorizon.structurelib.StructureLibAPI.CHANNEL_SHOW_ERROR;
-import com.gtnewhorizon.structurelib.block.BlockHint;
+import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
-import com.gtnewhorizon.structurelib.item.ItemBlockHint;
+
-import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
-import com.gtnewhorizon.structurelib.item.ItemFrontRotationTool;
-import com.gtnewhorizon.structurelib.proxy.CommonProxy;
-import com.gtnewhorizon.structurelib.util.XSTR;
-import cpw.mods.fml.common.Mod;
-import cpw.mods.fml.common.SidedProxy;
-import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import cpw.mods.fml.common.network.NetworkRegistry;
-import cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper;
-import cpw.mods.fml.common.registry.GameRegistry;
-import cpw.mods.fml.relauncher.Side;
-import cpw.mods.fml.relauncher.SideOnly;
 import net.minecraft.block.Block;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemBlock;
+import net.minecraft.item.ItemStack;
+import net.minecraft.launchwrapper.Launch;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
+import net.minecraftforge.common.util.Constants;
+
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import com.gtnewhorizon.structurelib.block.BlockHint;
+import com.gtnewhorizon.structurelib.command.CommandConfigureChannels;
+import com.gtnewhorizon.structurelib.command.CommandRegistryDebug;
+import com.gtnewhorizon.structurelib.item.ItemBlockHint;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+import com.gtnewhorizon.structurelib.item.ItemFrontRotationTool;
+import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import com.gtnewhorizon.structurelib.net.ErrorHintParticleMessage;
+import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
+import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
+import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
+import com.gtnewhorizon.structurelib.util.InventoryUtility;
+import com.gtnewhorizon.structurelib.util.XSTR;
+
+import cpw.mods.fml.common.Mod;
+import cpw.mods.fml.common.SidedProxy;
+import cpw.mods.fml.common.event.FMLInterModComms;
+import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.event.FMLServerStartingEvent;
+import cpw.mods.fml.common.network.NetworkRegistry;
+import cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper;
+import cpw.mods.fml.common.registry.GameRegistry;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+
 /**
  * This class does not contain a stable API. Refrain from using this class.
  */
-@Mod(modid = StructureLibAPI.MOD_ID, name = "StructureLib", version = "GRADLETOKEN_VERSION", acceptableRemoteVersions = "*", guiFactory = "com.gtnewhorizon.structurelib.GuiFactory")
+@Mod(
+        modid = MOD_ID,
+        name = "StructureLib",
+        version = Tags.VERSION,
+        acceptableRemoteVersions = "*",
+        guiFactory = "com.gtnewhorizon.structurelib.GuiFactory")
 public class StructureLib {
-	public static boolean DEBUG_MODE = Boolean.getBoolean("structurelib.debug");
-	public static Logger LOGGER = LogManager.getLogger("StructureLib");
 
-	@SidedProxy(serverSide = "com.gtnewhorizon.structurelib.proxy.CommonProxy", clientSide = "com.gtnewhorizon.structurelib.proxy.ClientProxy")
+    private static final String STRUCTURECOMPAT_MODID = "structurecompat";
-	static CommonProxy proxy;
+    public static boolean DEBUG_MODE;
-	static SimpleNetworkWrapper net = NetworkRegistry.INSTANCE.newSimpleChannel(StructureLibAPI.MOD_ID);
+    public static boolean PANIC_MODE = Boolean.getBoolean("structurelib.panic");
+    public static final Logger LOGGER = LogManager.getLogger("StructureLib");
 
-	static {
+    @SidedProxy(
-		net.registerMessage(AlignmentMessage.ServerHandler.class, AlignmentMessage.AlignmentQuery.class, 0, Side.SERVER);
+            serverSide = "com.gtnewhorizon.structurelib.CommonProxy",
-		net.registerMessage(AlignmentMessage.ClientHandler.class, AlignmentMessage.AlignmentData.class, 1, Side.CLIENT);
+            clientSide = "com.gtnewhorizon.structurelib.ClientProxy")
-	}
+    static CommonProxy proxy;
 
-	public static final XSTR RANDOM = new XSTR();
+    static final SimpleNetworkWrapper net = NetworkRegistry.INSTANCE.newSimpleChannel(MOD_ID);
 
-	static Block blockHint;
+    static {
-	static Item itemBlockHint;
+        net.registerMessage(
-	static Item itemFrontRotationTool;
+                AlignmentMessage.ServerHandler.class,
-	static Item itemConstructableTrigger;
+                AlignmentMessage.AlignmentQuery.class,
-	public static final CreativeTabs creativeTab = new CreativeTabs("structurelib") {
+                0,
-		@Override
+                Side.SERVER);
-		@SideOnly(Side.CLIENT)
+        net.registerMessage(AlignmentMessage.ClientHandler.class, AlignmentMessage.AlignmentData.class, 1, Side.CLIENT);
-		public Item getTabIconItem() {
+        net.registerMessage(UpdateHintParticleMessage.Handler.class, UpdateHintParticleMessage.class, 2, Side.CLIENT);
-			return StructureLibAPI.getItemBlockHint();
+        net.registerMessage(SetChannelDataMessage.Handler.class, SetChannelDataMessage.class, 3, Side.SERVER);
-		}
+        net.registerMessage(ErrorHintParticleMessage.Handler.class, ErrorHintParticleMessage.class, 4, Side.CLIENT);
-	};
+        net.registerMessage(RegistryOrderSyncMessage.Handler.class, RegistryOrderSyncMessage.class, 5, Side.SERVER);
 
-	@Mod.EventHandler
+        try {
-	public void preInit(FMLPreInitializationEvent e) {
+            DEBUG_MODE = Boolean.parseBoolean(System.getProperty("structurelib.debug"));
-		ConfigurationHandler.INSTANCE.init(e.getSuggestedConfigurationFile());
+        } catch (IllegalArgumentException | NullPointerException e) {
-		GameRegistry.registerBlock(blockHint = new BlockHint(), ItemBlockHint.class, "blockhint");
+            // turn on debug by default in dev mode
-		itemBlockHint = ItemBlock.getItemFromBlock(StructureLibAPI.getBlockHint());
+            // this will be overridden if above property is present and set to false
-		GameRegistry.registerItem(itemFrontRotationTool = new ItemFrontRotationTool(), itemFrontRotationTool.getUnlocalizedName());
+            DEBUG_MODE = (Boolean) Launch.blackboard.get("fml.deobfuscatedEnvironment");
-		GameRegistry.registerItem(itemConstructableTrigger = new ItemConstructableTrigger(), itemConstructableTrigger.getUnlocalizedName());
+        }
-		proxy.preInit(e);
+    }
-	}
 
-	public static void addClientSideChatMessages(String... messages) {
+    public static final XSTR RANDOM = new XSTR();
-		proxy.addClientSideChatMessages(messages);
-	}
 
-	public static EntityPlayer getCurrentPlayer() {
+    @Mod.Instance
-		return proxy.getCurrentPlayer();
+    static StructureLib INSTANCE;
-	}
+    @Mod.Instance(STRUCTURECOMPAT_MODID)
+    static Object COMPAT;
 
-	public static boolean isCurrentPlayer(EntityPlayer player) {
+    static Block blockHint;
-		return proxy.isCurrentPlayer(player);
+    static Item itemBlockHint;
-	}
+    static Item itemFrontRotationTool;
+    static Item itemConstructableTrigger;
+    public static final CreativeTabs creativeTab = new CreativeTabs("structurelib") {
+
+        @Override
+        @SideOnly(Side.CLIENT)
+        public Item getTabIconItem() {
+            return StructureLibAPI.getItemBlockHint();
+        }
+    };
+
+    @Mod.EventHandler
+    public void preInit(FMLPreInitializationEvent e) {
+        ConfigurationHandler.INSTANCE.init(e.getSuggestedConfigurationFile());
+        GameRegistry.registerBlock(blockHint = new BlockHint(), ItemBlockHint.class, "blockhint");
+        itemBlockHint = ItemBlock.getItemFromBlock(StructureLibAPI.getBlockHint());
+        GameRegistry.registerItem(
+                itemFrontRotationTool = new ItemFrontRotationTool(),
+                itemFrontRotationTool.getUnlocalizedName());
+        GameRegistry.registerItem(
+                itemConstructableTrigger = new ItemConstructableTrigger(),
+                itemConstructableTrigger.getUnlocalizedName());
+        proxy.preInit(e);
+        NetworkRegistry.INSTANCE.registerGuiHandler(instance(), new GuiHandler());
+
+        InventoryUtility.init();
+
+        ChannelDescription.set(CHANNEL_SHOW_ERROR, MOD_ID, "channels.structurelib.show_errors");
+
+        DevelopHelper.onPreInit();
+    }
+
+    @Mod.EventHandler
+    public void loadComplete(FMLLoadCompleteEvent e) {
+        proxy.loadComplete(e);
+    }
+
+    @Mod.EventHandler
+    public void serverStarting(FMLServerStartingEvent e) {
+        e.registerServerCommand(new CommandConfigureChannels());
+        e.registerServerCommand(new CommandRegistryDebug());
+    }
+
+    @Mod.EventHandler
+    public void handleIMC(FMLInterModComms.IMCEvent event) {
+        for (FMLInterModComms.IMCMessage message : event.getMessages()) {
+            switch (message.key) {
+                case "register_channel":
+                    processRegisterChannel(message);
+                    break;
+                case "register_channel_item":
+                    processRegisterChannelItem(message);
+                    break;
+            }
+        }
+    }
+
+    private void processRegisterChannel(FMLInterModComms.IMCMessage message) {
+        NBTTagList tags = message.getNBTValue().getTagList("Channels", Constants.NBT.TAG_COMPOUND);
+        for (int i = 0; i < tags.tagCount(); i++) {
+            NBTTagCompound tag = tags.getCompoundTagAt(i);
+            StructureLibAPI.registerChannelDescription(
+                    tag.getString("Channel"),
+                    message.getSender(),
+                    tag.getString("Description"));
+        }
+    }
+
+    private void processRegisterChannelItem(FMLInterModComms.IMCMessage message) {
+        NBTTagList items = message.getNBTValue().getTagList("Items", Constants.NBT.TAG_COMPOUND);
+        for (int i = 0; i < items.tagCount(); i++) {
+            NBTTagCompound itemTag = items.getCompoundTagAt(i);
+            ItemStack item = ItemStack.loadItemStackFromNBT(itemTag.getCompoundTag("Item"));
+            NBTTagList tags = itemTag.getTagList("Channels", Constants.NBT.TAG_COMPOUND);
+            for (int j = 0; j < tags.tagCount(); j++) {
+                NBTTagCompound tag = tags.getCompoundTagAt(j);
+                StructureLibAPI.registerChannelItem(
+                        tag.getString("Channel"),
+                        message.getSender(),
+                        tag.getInteger("Value"),
+                        item);
+            }
+        }
+    }
+
+    public static void addClientSideChatMessages(String... messages) {
+        proxy.addClientSideChatMessages(messages);
+    }
+
+    public static EntityPlayer getCurrentPlayer() {
+        return proxy.getCurrentPlayer();
+    }
+
+    public static boolean isCurrentPlayer(EntityPlayer player) {
+        return proxy.isCurrentPlayer(player);
+    }
+
+    public static long getOverworldTime() {
+        return proxy.getOverworldTime();
+    }
+
+    public static StructureLib instance() {
+        return INSTANCE;
+    }
+
+    public CommonProxy proxy() {
+        return proxy;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/StructureLibAPI.java

@@ -1,131 +1,388 @@
 package com.gtnewhorizon.structurelib;
 
-import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import static com.gtnewhorizon.structurelib.StructureLib.proxy;
-import com.gtnewhorizon.structurelib.alignment.IAlignmentProvider;
+
-import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
-import cpw.mods.fml.common.network.NetworkRegistry;
 import net.minecraft.block.Block;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.World;
 
-import static com.gtnewhorizon.structurelib.StructureLib.proxy;
+import com.gtnewhorizon.gtnhlib.util.AnimatedTooltipHandler;
+import com.gtnewhorizon.structurelib.alignment.IAlignment;
+import com.gtnewhorizon.structurelib.alignment.IAlignmentProvider;
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import com.gtnewhorizon.structurelib.structure.AutoPlaceEnvironment;
+import com.gtnewhorizon.structurelib.structure.IStructureDefinition;
+
+import cpw.mods.fml.common.network.NetworkRegistry;
 
 /**
- * A stable interface into the structure lib's internals. Backwards compatibility is maintained to the maximum extend possible.
+ * A stable interface into the structure lib's internals. Backwards compatibility is maintained to the maximum extend
+ * possible.
  */
 public class StructureLibAPI {
-	public static final String MOD_ID = "structurelib";
-	public static final int HINT_BLOCK_META_GENERIC_0 = 0;
-	public static final int HINT_BLOCK_META_GENERIC_1 = 1;
-	public static final int HINT_BLOCK_META_GENERIC_2 = 2;
-	public static final int HINT_BLOCK_META_GENERIC_3 = 3;
-	public static final int HINT_BLOCK_META_GENERIC_4 = 4;
-	public static final int HINT_BLOCK_META_GENERIC_5 = 5;
-	public static final int HINT_BLOCK_META_GENERIC_6 = 6;
-	public static final int HINT_BLOCK_META_GENERIC_7 = 7;
-	public static final int HINT_BLOCK_META_GENERIC_8 = 8;
-	public static final int HINT_BLOCK_META_GENERIC_9 = 9;
-	public static final int HINT_BLOCK_META_GENERIC_10 = 10;
-	public static final int HINT_BLOCK_META_GENERIC_11 = 11;
-	public static final int HINT_BLOCK_META_DEFAULT = 12;
-	public static final int HINT_BLOCK_META_AIR = 13;
-	public static final int HINT_BLOCK_META_NOT_AIR = 14;
-	public static final int HINT_BLOCK_META_ERROR = 15;
 
-	/**
+    public static final String MOD_ID = "structurelib";
-	 * Start a batch of hinting. All hints particles generated during one batch will be considered to belong to one hologram.
+    public static final int HINT_BLOCK_META_GENERIC_0 = 0;
-	 *
+    public static final int HINT_BLOCK_META_GENERIC_1 = 1;
-	 * You don't need to call this unless your constructable tool didn't call {@link com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility#handle(ItemStack, EntityPlayer, World, int, int, int, int)}
+    public static final int HINT_BLOCK_META_GENERIC_2 = 2;
-	 */
+    public static final int HINT_BLOCK_META_GENERIC_3 = 3;
-	public static void startHinting(World w) {
+    public static final int HINT_BLOCK_META_GENERIC_4 = 4;
-		proxy.startHinting(w);
+    public static final int HINT_BLOCK_META_GENERIC_5 = 5;
-	}
+    public static final int HINT_BLOCK_META_GENERIC_6 = 6;
+    public static final int HINT_BLOCK_META_GENERIC_7 = 7;
+    public static final int HINT_BLOCK_META_GENERIC_8 = 8;
+    public static final int HINT_BLOCK_META_GENERIC_9 = 9;
+    public static final int HINT_BLOCK_META_GENERIC_10 = 10;
+    public static final int HINT_BLOCK_META_GENERIC_11 = 11;
+    public static final int HINT_BLOCK_META_DEFAULT = 12;
+    public static final int HINT_BLOCK_META_AIR = 13;
+    public static final int HINT_BLOCK_META_NOT_AIR = 14;
+    public static final int HINT_BLOCK_META_ERROR = 15;
+    public static final String CHANNEL_SHOW_ERROR = "show_error";
+    static final ThreadLocal<Object> instrument = new ThreadLocal<>();
 
-	/**
+    /**
-	 * Start current batch of hinting. All hints particles generated during one batch will be considered to belong to one hologram.
+     * Start instrumenting <b>for the current thread only</b>. When instrumentation is enabled,
-	 *
+     * {@link IStructureDefinition}'s builtin iteration methods will send {@link StructureEvent} and its subclasses when
-	 * You don't need to call this unless your constructable tool didn't call {@link com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility#handle(ItemStack, EntityPlayer, World, int, int, int, int)}
+     * appropriate. Otherwise, these events will not be sent at all, regardless of whether a listener for these events
-	 */
+     * are registered.
-	public static void endHinting(World w) {
+     * <p>
-		proxy.endHinting(w);
+     * Identifiers are required to be value-comparable, i.e. overrides {@link Object#equals(Object)}. Suggested
-	}
+     * identifier includes
+     * <ul>
+     * <li>Mod Instance or {@link cpw.mods.fml.common.ModContainer}</li>
+     * <li>{@link com.gtnewhorizon.structurelib.alignment.constructable.IConstructable} and its friends, if you are
+     * triggering structure check via this interface.</li>
+     * <li>{@link net.minecraft.util.ResourceLocation}</li>
+     * </ul>
+     * <p>
+     * It's an API abuse for normal {@link IStructureDefinition} users to depend on this feature. They have full control
+     * and full knowledge of the {@link IStructureDefinition} they are using. Using events to instrument the structure
+     * check/autoplace is completely unnecessary and does nothing but add overhead.
+     * <p>
+     * Instruments are required to call {@link #disableInstrument()} whenever it is done with its business, as there can
+     * be only one instrument for any given thread.
+     *
+     * @param identifier an identifier sent along the actual event.
+     * @throws IllegalStateException if instrument has already been enabled.
+     */
+    public static void enableInstrument(Object identifier) {
+        if (isInstrumentEnabled()) throw new IllegalStateException();
+        instrument.set(identifier);
+    }
 
-	public static void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {
+    /**
-		proxy.hintParticleTinted(w, x, y, z, icons, RGBa);
+     * Stop instrumenting.
-	}
+     *
+     * @throws IllegalStateException if instrumenting hasn't been enabled.
+     */
+    public static void disableInstrument() {
+        if (!isInstrumentEnabled()) throw new IllegalStateException();
+        instrument.set(null);
+    }
 
-	public static void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa) {
+    /**
-		proxy.hintParticleTinted(w, x, y, z, block, meta, RGBa);
+     * Check if instrumenting is enabled.
-	}
+     *
+     * @return true if enabled, false otherwise
+     */
+    public static boolean isInstrumentEnabled() {
+        return instrument.get() != null;
+    }
 
-	public static void hintParticle(World w, int x, int y, int z, IIcon[] icons) {
+    /**
-		proxy.hintParticle(w, x, y, z, icons);
+     * Start a batch of hinting. All hints particles generated during one batch will be considered to belong to one
-	}
+     * hologram.
+     * <p>
+     * You don't need to call this unless your constructable tool didn't call
+     * {@link com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility#handle(ItemStack, EntityPlayer, World, int, int, int, int)}
+     */
+    public static void startHinting(World w) {
+        proxy.startHinting(w);
+    }
 
-	public static void hintParticle(World w, int x, int y, int z, Block block, int meta) {
+    /**
-		proxy.hintParticle(w, x, y, z, block, meta);
+     * End current batch of hinting. All hints particles generated during one batch will be considered to belong to one
-	}
+     * hologram.
+     * <p>
+     * You don't need to call this unless your constructable tool didn't call
+     * {@link com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility#handle(ItemStack, EntityPlayer, World, int, int, int, int)}
+     */
+    public static void endHinting(World w) {
+        proxy.endHinting(w);
+    }
 
-	/**
+    /**
-	 * Query the ExtendedFacing of this tile entity.
+     * Generate a new hint particle on client side at given location using given textures with a tint.
-	 * The ExtendedFacing will later be set onto given tile entity via {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)}
+     *
-	 * upon arrival of server reply.
+     * @param w     World to spawn. Usually the client world.
-	 * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     * @param x     x coord
-	 */
+     * @param y     y coord
-	public static void queryAlignment(IAlignmentProvider provider) {
+     * @param z     z coord
-		StructureLib.net.sendToServer(new AlignmentMessage.AlignmentQuery(provider));
+     * @param icons 6 texture. in forge direction order.
-	}
+     * @param RGBa  a 4 short array. tint in rgba form. currently alpha channel is ignored, but we might change this
+     *              later on.
+     */
+    public static void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {
+        proxy.hintParticleTinted(w, x, y, z, icons, RGBa);
+    }
 
-	/**
+    /**
-	 * Send the ExtendedFacing of this Tile Entity to all players. Can be called on server side only.
+     * Generate a new hint particle on client side at given location using textures from given block with a tint.
-	 * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     *
-	 */
+     * @param w     World to spawn. Usually the client world.
-	public static void sendAlignment(IAlignmentProvider provider) {
+     * @param x     x coord
-		StructureLib.net.sendToAll(new AlignmentMessage.AlignmentData(provider));
+     * @param y     y coord
-	}
+     * @param z     z coord
+     * @param block block to take texture from
+     * @param meta  the meta of block to take texture from
+     * @param RGBa  a 4 short array. tint in rgba form. currently alpha channel is ignored, but we might change this
+     *              later on.
+     */
+    public static void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa) {
+        proxy.hintParticleTinted(w, x, y, z, block, meta, RGBa);
+    }
 
-	/**
+    /**
-	 * Send the ExtendedFacing of this Tile Entity to given player. Can be called on server side only.
+     * Generate a new hint particle on client side at given location using given textures.
-	 * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     *
-	 */
+     * @param w     World to spawn. Usually the client world.
-	public static void sendAlignment(IAlignmentProvider provider, EntityPlayerMP player) {
+     * @param x     x coord
-		StructureLib.net.sendTo(new AlignmentMessage.AlignmentData(provider), player);
+     * @param y     y coord
-	}
+     * @param z     z coord
+     * @param icons 6 texture. in forge direction order.
+     */
+    public static void hintParticle(World w, int x, int y, int z, IIcon[] icons) {
+        proxy.hintParticle(w, x, y, z, icons);
+    }
 
-	/**
+    /**
-	 * Send the ExtendedFacing of this Tile Entity to all players around target point. Can be called on server side only.
+     * Generate a new hint particle on client side at given location using textures from given block.
-	 * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     *
-	 */
+     * @param w     World to spawn. Usually the client world.
-	public static void sendAlignment(IAlignmentProvider provider, NetworkRegistry.TargetPoint targetPoint) {
+     * @param x     x coord
-		StructureLib.net.sendToAllAround(new AlignmentMessage.AlignmentData(provider), targetPoint);
+     * @param y     y coord
-	}
+     * @param z     z coord
+     * @param block block to take texture from
+     * @param meta  the meta of block to take texture from
+     */
+    public static void hintParticle(World w, int x, int y, int z, Block block, int meta) {
+        proxy.hintParticle(w, x, y, z, block, meta);
+    }
 
+    /**
+     * Update the tint of given hint particle. Do nothing if particle not found.
+     * <p>
+     * Can be called on either client side or server side. Server side will schedule a network message to update it for
+     * this player only. Will do nothing if no hint particle is found at given location.
+     *
+     * @return false if nothing updated. true if updated or update instruction sent.
+     */
+    public static boolean markHintParticleError(EntityPlayer player, World w, int x, int y, int z) {
+        return proxy.markHintParticleError(player, w, x, y, z);
+    }
 
-	/**
+    /**
-	 * Send the ExtendedFacing of this Tile Entity to all players in that dimension. Can be called on server side only.
+     * Update the tint of given hint particle. Do nothing if particle not found.
-	 * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     *
-	 */
+     * @return false if nothing updated. true if updated.
-	public static void sendAlignment(IAlignmentProvider provider, World dimension) {
+     */
-		StructureLib.net.sendToDimension(new AlignmentMessage.AlignmentData(provider), dimension.provider.dimensionId);
+    public static boolean updateHintParticleTint(EntityPlayer player, World w, int x, int y, int z, short[] RGBa) {
-	}
+        return proxy.updateHintParticleTint(player, w, x, y, z, RGBa);
+    }
 
-	public static Block getBlockHint() {
+    /**
-		return StructureLib.blockHint;
+     * Query the ExtendedFacing of this tile entity from client side. Can be sent only on client side. The
-	}
+     * ExtendedFacing will later be set onto given tile entity via
+     * {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)} upon arrival of
+     * server reply.
+     * <p>
+     * The server side will query the {@link ExtendedFacing} of this provider using
+     * {@link IAlignment#getExtendedFacing()}
+     *
+     * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     */
+    public static void queryAlignment(IAlignmentProvider provider) {
+        StructureLib.net.sendToServer(new AlignmentMessage.AlignmentQuery(provider));
+    }
 
-	public static Item getItemBlockHint() {
+    /**
-		return StructureLib.itemBlockHint;
+     * Send the ExtendedFacing of this Tile Entity to all players. Can be called on server side only.
-	}
+     * <p>
+     * The receiving tile entity will receive the {@link ExtendedFacing} via its
+     * {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)} method.
+     *
+     * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     */
+    public static void sendAlignment(IAlignmentProvider provider) {
+        StructureLib.net.sendToAll(new AlignmentMessage.AlignmentData(provider));
+    }
 
-	public static boolean isDebugEnabled() {
+    /**
-		return StructureLib.DEBUG_MODE;
+     * Send the ExtendedFacing of this Tile Entity to given player. Can be called on server side only.
-	}
+     * <p>
+     * The receiving tile entity will receive the {@link ExtendedFacing} via its
+     * {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)} method.
+     *
+     * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     */
+    public static void sendAlignment(IAlignmentProvider provider, EntityPlayerMP player) {
+        StructureLib.net.sendTo(new AlignmentMessage.AlignmentData(provider), player);
+    }
 
-	public static void setDebugEnabled(boolean enabled) {
+    /**
-		StructureLib.DEBUG_MODE = enabled;
+     * Send the ExtendedFacing of this Tile Entity to all players around target point. Can be called on server side
-	}
+     * only.
+     * <p>
+     * The receiving tile entity will receive the {@link ExtendedFacing} via its
+     * {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)} method.
+     *
+     * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     */
+    public static void sendAlignment(IAlignmentProvider provider, NetworkRegistry.TargetPoint targetPoint) {
+        StructureLib.net.sendToAllAround(new AlignmentMessage.AlignmentData(provider), targetPoint);
+    }
+
+    /**
+     * Send the ExtendedFacing of this Tile Entity to all players in that dimension. Can be called on server side only.
+     * <p>
+     * The receiving tile entity will receive the {@link ExtendedFacing} via its
+     * {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)} method.
+     *
+     * @throws IllegalArgumentException if is not tile entity or provided a null alignment
+     */
+    public static void sendAlignment(IAlignmentProvider provider, World dimension) {
+        StructureLib.net.sendToDimension(new AlignmentMessage.AlignmentData(provider), dimension.provider.dimensionId);
+    }
+
+    /**
+     * Get the Block for StructureLib supplied hint block.
+     */
+    public static Block getBlockHint() {
+        return StructureLib.blockHint;
+    }
+
+    /**
+     * Get the ItemBlock for StructureLib supplied hint block.
+     */
+    public static Item getItemBlockHint() {
+        return StructureLib.itemBlockHint;
+    }
+
+    /**
+     * Get the hologram item.
+     */
+    public static Item getDefaultHologramItem() {
+        return StructureLib.itemConstructableTrigger;
+    }
+
+    /**
+     * Check if structure debug mode is on.
+     *
+     * @return true if debug mode is on
+     */
+    public static boolean isDebugEnabled() {
+        return StructureLib.DEBUG_MODE;
+    }
+
+    public static void setDebugEnabled(boolean enabled) {
+        StructureLib.DEBUG_MODE = enabled;
+    }
+
+    /**
+     * Determines if given block can be replaced without much effort. The exact predicate clauses is not stable and will
+     * be changed, but the general idea will always stay the same.
+     * <p>
+     * Use this in your
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)}
+     */
+    @Deprecated
+    public static boolean isBlockTriviallyReplaceable(World w, int x, int y, int z, EntityPlayerMP actor) {
+        return isBlockTriviallyReplaceable(w, x, y, z, (EntityPlayer) actor);
+    }
+
+    /**
+     * Determines if given block can be replaced without much effort. The exact predicate clauses is not stable and will
+     * be changed, but the general idea will always stay the same.
+     * <p>
+     * Use this in your
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)}
+     */
+    public static boolean isBlockTriviallyReplaceable(World w, int x, int y, int z, EntityPlayer actor) {
+        // TODO extend this function a bit
+        Block block = w.getBlock(x, y, z);
+        return block.isAir(w, x, y, z) || block.isReplaceable(w, x, y, z);
+    }
+
+    /**
+     * Send chat to player, but throttled.
+     *
+     * @param throttleKey      throttle key. Must properly implement {@link Object#hashCode()} and
+     *                         {@link Object#equals(Object)} to handle value equality.
+     * @param player           player to send chat to
+     * @param text             chat to send
+     * @param intervalRequired interval required before last recorded time to actually send the message. unit in
+     *                         millisecond. we purposefully chose to not use a bigger data type to limit how long this
+     *                         interval can be
+     */
+    public static void addThrottledChat(Object throttleKey, EntityPlayer player, IChatComponent text,
+            short intervalRequired) {
+        addThrottledChat(throttleKey, player, text, intervalRequired, false);
+    }
+
+    /**
+     * Send chat to player, but throttled.
+     *
+     * @param throttleKey         throttle key. Must properly implement {@link Object#hashCode()} and
+     *                            {@link Object#equals(Object)} to handle value equality.
+     * @param player              player to send chat to
+     * @param text                chat to send
+     * @param intervalRequired    interval required before last recorded time to actually send the message. unit in
+     *                            millisecond. we purposefully chose to not use a bigger data type to limit how long
+     *                            this interval can be
+     * @param forceUpdateLastSend if true, always update the last send time, even if the message isn't actually sent.
+     */
+    public static void addThrottledChat(Object throttleKey, EntityPlayer player, IChatComponent text,
+            short intervalRequired, boolean forceUpdateLastSend) {
+        proxy.addThrottledChat(throttleKey, player, text, intervalRequired, forceUpdateLastSend);
+    }
+
+    /**
+     * Register a channel description here. The description should describe how a channel will be used inside your mod.
+     *
+     * @param channel     channel key
+     * @param modid       your modid
+     * @param description localization key for your description
+     */
+    public static void registerChannelDescription(final String channel, final String modid, final String description) {
+        ChannelDescription.set(channel, modid, description);
+    }
+
+    /**
+     * Register an item stack as an indicator for a (channel, value) pair.
+     *
+     * @param channel      channel key
+     * @param modid        your modid
+     * @param channelValue value
+     * @param stack        item stack. having a metadata of
+     *                     {@link net.minecraftforge.oredict.OreDictionary#WILDCARD_VALUE} will match without comparing
+     *                     NBT or metadata value. having a tag with {@code tag.getBoolean("*") == true} will match
+     *                     without comparing NBT.
+     */
+    public static void registerChannelItem(final String channel, final String modid, final int channelValue,
+            final ItemStack stack) {
+        ChannelDescription.item(channel, channelValue, stack);
+        AnimatedTooltipHandler.addItemTooltip(
+                stack,
+                AnimatedTooltipHandler.translatedText("structurelib.tooltip.channelvalue", channelValue, channel));
+        AnimatedTooltipHandler.addItemTooltip(
+                stack,
+                AnimatedTooltipHandler.translatedText("structurelib.tooltip.indicator_dnd", channelValue, channel));
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/AlignmentLimits.java

@@ -1,8 +1,9 @@
 package com.gtnewhorizon.structurelib.alignment;
 
+import net.minecraftforge.common.util.ForgeDirection;
+
 import com.gtnewhorizon.structurelib.alignment.enumerable.Flip;
 import com.gtnewhorizon.structurelib.alignment.enumerable.Rotation;
-import net.minecraftforge.common.util.ForgeDirection;
 
 class AlignmentLimits implements IAlignmentLimits {
 

src/main/java/com/gtnewhorizon/structurelib/alignment/AlignmentUtility.java

@@ -7,10 +7,10 @@ import net.minecraft.world.World;
 import net.minecraftforge.common.util.FakePlayer;
 
 public class AlignmentUtility {
-    private AlignmentUtility(){
-    }
 
-    public static boolean handle(EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ){
+    private AlignmentUtility() {}
+
+    public static boolean handle(EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ) {
         TileEntity tTileEntity = aWorld.getTileEntity(aX, aY, aZ);
         if (tTileEntity == null || aPlayer instanceof FakePlayer) {
             return aPlayer instanceof EntityPlayerMP;

src/main/java/com/gtnewhorizon/structurelib/alignment/IAlignment.java

@@ -1,66 +1,73 @@
 package com.gtnewhorizon.structurelib.alignment;
 
+import net.minecraftforge.common.util.ForgeDirection;
+
 import com.gtnewhorizon.structurelib.alignment.enumerable.Direction;
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
 import com.gtnewhorizon.structurelib.alignment.enumerable.Flip;
 import com.gtnewhorizon.structurelib.alignment.enumerable.Rotation;
-import net.minecraftforge.common.util.ForgeDirection;
 
-public interface IAlignment extends IAlignmentLimits,IAlignmentProvider {
+public interface IAlignment extends IAlignmentLimits, IAlignmentProvider {
-    int DIRECTIONS_COUNT= Direction.VALUES.length;
+
-    int ROTATIONS_COUNT= Rotation.VALUES.length;
+    int DIRECTIONS_COUNT = Direction.VALUES.length;
-    int FLIPS_COUNT= Flip.VALUES.length;
+    int ROTATIONS_COUNT = Rotation.VALUES.length;
+    int FLIPS_COUNT = Flip.VALUES.length;
     int STATES_COUNT = ExtendedFacing.STATES_COUNT;
 
     ExtendedFacing getExtendedFacing();
 
+    /**
+     * Set the facing without additional checks. Tools altering facing should use
+     * {@link #toolSetExtendedFacing(ExtendedFacing)} instead.
+     */
     void setExtendedFacing(ExtendedFacing alignment);
 
     IAlignmentLimits getAlignmentLimits();
 
     @Override
-    default IAlignment getAlignment(){
+    default IAlignment getAlignment() {
         return this;
     }
 
-    static int getAlignmentIndex(ForgeDirection direction, Rotation rotation, Flip flip){
+    static int getAlignmentIndex(ForgeDirection direction, Rotation rotation, Flip flip) {
-        return (direction.ordinal()*ROTATIONS_COUNT+rotation.getIndex())*FLIPS_COUNT+flip.getIndex();
+        return (direction.ordinal() * ROTATIONS_COUNT + rotation.getIndex()) * FLIPS_COUNT + flip.getIndex();
     }
 
-    default ForgeDirection getDirection(){
+    default ForgeDirection getDirection() {
         return getExtendedFacing().getDirection();
     }
 
-    default void setDirection(ForgeDirection direction){
+    default void setDirection(ForgeDirection direction) {
         setExtendedFacing(getExtendedFacing().with(direction));
     }
 
-    default Rotation getRotation(){
+    default Rotation getRotation() {
         return getExtendedFacing().getRotation();
     }
 
-    default void setRotation(Rotation rotation){
+    default void setRotation(Rotation rotation) {
         setExtendedFacing(getExtendedFacing().with(rotation));
     }
 
-    default Flip getFlip(){
+    default Flip getFlip() {
         return getExtendedFacing().getFlip();
     }
 
-    default void setFlip(Flip flip){
+    default void setFlip(Flip flip) {
         setExtendedFacing(getExtendedFacing().with(flip));
     }
 
-    default boolean toolSetDirection(ForgeDirection direction){
+    default boolean toolSetDirection(ForgeDirection direction) {
-        if(direction==null || direction==ForgeDirection.UNKNOWN){
+        if (direction == null || direction == ForgeDirection.UNKNOWN) {
-            for (int i = 0,j=getDirection().ordinal()+1, valuesLength = Direction.VALUES.length; i < valuesLength; i++) {
+            for (int i = 0, j = getDirection().ordinal() + 1, valuesLength = Direction.VALUES.length; i
+                    < valuesLength; i++) {
                 if (toolSetDirection(Direction.VALUES[(j + i) % valuesLength].getForgeDirection())) {
                     return true;
                 }
             }
-        }else {
+        } else {
             for (ExtendedFacing extendedFacing : ExtendedFacing.FOR_FACING.get(direction)) {
-                if(checkedSetExtendedFacing(extendedFacing)){
+                if (checkedSetExtendedFacing(extendedFacing)) {
                     return true;
                 }
             }
@@ -68,17 +75,17 @@ public interface IAlignment extends IAlignmentLimits,IAlignmentProvider {
         return false;
     }
 
-    default boolean checkedSetDirection(ForgeDirection direction){
+    default boolean checkedSetDirection(ForgeDirection direction) {
-        if (isNewDirectionValid(direction)){
+        if (isNewDirectionValid(direction)) {
             setDirection(direction);
             return true;
         }
         return false;
     }
 
-    default boolean canSetToDirectionAny(ForgeDirection direction){
+    default boolean canSetToDirectionAny(ForgeDirection direction) {
         for (ExtendedFacing extendedFacing : ExtendedFacing.FOR_FACING.get(direction)) {
-            if(isNewExtendedFacingValid(extendedFacing)){
+            if (isNewExtendedFacingValid(extendedFacing)) {
                 return true;
             }
         }
@@ -86,66 +93,71 @@ public interface IAlignment extends IAlignmentLimits,IAlignmentProvider {
     }
 
     default boolean toolSetRotation(Rotation rotation) {
-        if(rotation==null){
+        if (rotation == null) {
             int flips = Flip.VALUES.length;
             int rotations = Rotation.VALUES.length;
-            for (int ii = 0,jj=getFlip().ordinal(); ii < flips; ii++) {
+            for (int ii = 0, jj = getFlip().ordinal(); ii < flips; ii++) {
                 for (int i = 1, j = getRotation().ordinal(); i < rotations; i++) {
-                    if (checkedSetExtendedFacing(ExtendedFacing.of(getDirection(), Rotation.VALUES[(j + i) % rotations], Flip.VALUES[(jj + ii) % flips]))) {
+                    if (checkedSetExtendedFacing(
+                            ExtendedFacing.of(
+                                    getDirection(),
+                                    Rotation.VALUES[(j + i) % rotations],
+                                    Flip.VALUES[(jj + ii) % flips]))) {
                         return true;
                     }
                 }
             }
             return false;
-        }else {
+        } else {
             return checkedSetRotation(rotation);
         }
     }
 
-    default boolean checkedSetRotation(Rotation rotation){
+    default boolean checkedSetRotation(Rotation rotation) {
-        if (isNewRotationValid(rotation)){
+        if (isNewRotationValid(rotation)) {
             setRotation(rotation);
             return true;
         }
         return false;
     }
 
-    default boolean toolSetFlip(Flip flip){
+    default boolean toolSetFlip(Flip flip) {
-        if(flip==null){
+        if (flip == null) {
             for (int i = 1, j = getFlip().ordinal(), valuesLength = Flip.VALUES.length; i < valuesLength; i++) {
                 if (checkedSetFlip(Flip.VALUES[(j + i) % valuesLength])) {
                     return true;
                 }
             }
             return false;
-        }else {
+        } else {
             return checkedSetFlip(flip);
         }
     }
 
-    default boolean checkedSetFlip(Flip flip){
+    default boolean checkedSetFlip(Flip flip) {
-        if (isNewFlipValid(flip)){
+        if (isNewFlipValid(flip)) {
             setFlip(flip);
             return true;
         }
         return false;
     }
 
-    default boolean toolSetExtendedFacing(ExtendedFacing extendedFacing){
+    default boolean toolSetExtendedFacing(ExtendedFacing extendedFacing) {
-        if(extendedFacing==null){
+        if (extendedFacing == null) {
-            for (int i = 0,j=getExtendedFacing().ordinal()+1, valuesLength = ExtendedFacing.VALUES.length; i < valuesLength; i++) {
+            for (int i = 0, j = getExtendedFacing().ordinal() + 1, valuesLength = ExtendedFacing.VALUES.length; i
-                if (checkedSetExtendedFacing(ExtendedFacing.VALUES[(j + i)%valuesLength])){
+                    < valuesLength; i++) {
+                if (checkedSetExtendedFacing(ExtendedFacing.VALUES[(j + i) % valuesLength])) {
                     return true;
                 }
             }
             return false;
-        }else {
+        } else {
             return checkedSetExtendedFacing(extendedFacing);
         }
     }
 
-    default boolean checkedSetExtendedFacing(ExtendedFacing alignment){
+    default boolean checkedSetExtendedFacing(ExtendedFacing alignment) {
-        if (isNewExtendedFacingValid(alignment)){
+        if (isNewExtendedFacingValid(alignment)) {
             setExtendedFacing(alignment);
             return true;
         }
@@ -153,31 +165,53 @@ public interface IAlignment extends IAlignmentLimits,IAlignmentProvider {
     }
 
     default boolean isNewDirectionValid(ForgeDirection direction) {
-        return isNewExtendedFacingValid(direction,getRotation(),getFlip());
+        return isNewExtendedFacingValid(direction, getRotation(), getFlip());
     }
 
-    default boolean isNewRotationValid(Rotation rotation){
+    default boolean isNewRotationValid(Rotation rotation) {
-        return isNewExtendedFacingValid(getDirection(),rotation,getFlip());
+        return isNewExtendedFacingValid(getDirection(), rotation, getFlip());
     }
 
-    default boolean isNewFlipValid(Flip flip){
+    default boolean isNewFlipValid(Flip flip) {
-        return isNewExtendedFacingValid(getDirection(),getRotation(),flip);
+        return isNewExtendedFacingValid(getDirection(), getRotation(), flip);
     }
 
     default boolean isExtendedFacingValid() {
-        return isNewExtendedFacingValid(getDirection(),getRotation(),getFlip());
+        return isNewExtendedFacingValid(getDirection(), getRotation(), getFlip());
     }
 
     @Override
-    default boolean isNewExtendedFacingValid(ForgeDirection direction, Rotation rotation, Flip flip){
+    default boolean isNewExtendedFacingValid(ForgeDirection direction, Rotation rotation, Flip flip) {
         return getAlignmentLimits().isNewExtendedFacingValid(direction, rotation, flip);
     }
 
     @Override
-    default boolean isNewExtendedFacingValid(ExtendedFacing alignment){
+    default boolean isNewExtendedFacingValid(ExtendedFacing alignment) {
-        return getAlignmentLimits().isNewExtendedFacingValid(
+        return getAlignmentLimits()
-                alignment.getDirection(),
+                .isNewExtendedFacingValid(alignment.getDirection(), alignment.getRotation(), alignment.getFlip());
-                alignment.getRotation(),
-                alignment.getFlip());
     }
-}
+
+    /**
+     * Check if this object support a flip change, assuming both direction and rotation is not changed.
+     */
+    default boolean isFlipChangeAllowed() {
+        ExtendedFacing facing = getExtendedFacing();
+        for (Flip flip : Flip.VALUES) {
+            if (flip == getFlip()) continue;
+            if (isNewExtendedFacingValid(facing.with(flip))) return true;
+        }
+        return false;
+    }
+
+    /**
+     * Check if this object support a rotation change, assuming both direction and flip is not changed.
+     */
+    default boolean isRotationChangeAllowed() {
+        ExtendedFacing facing = getExtendedFacing();
+        for (Rotation rotation : Rotation.VALUES) {
+            if (rotation == getRotation()) continue;
+            if (isNewExtendedFacingValid(facing.with(rotation))) return true;
+        }
+        return false;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/alignment/IAlignmentLimits.java

@@ -1,26 +1,45 @@
 package com.gtnewhorizon.structurelib.alignment;
-import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+
-import com.gtnewhorizon.structurelib.alignment.enumerable.Flip;
+import static com.gtnewhorizon.structurelib.alignment.IAlignment.STATES_COUNT;
-import com.gtnewhorizon.structurelib.alignment.enumerable.Rotation;
-import net.minecraftforge.common.util.ForgeDirection;
 
 import java.util.Arrays;
 import java.util.Optional;
 import java.util.function.Function;
 
-import static com.gtnewhorizon.structurelib.alignment.IAlignment.STATES_COUNT;
+import net.minecraftforge.common.util.ForgeDirection;
+
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.alignment.enumerable.Flip;
+import com.gtnewhorizon.structurelib.alignment.enumerable.Rotation;
 
 public interface IAlignmentLimits {
 
+    /**
+     * Can be placed in any orientation.
+     */
     IAlignmentLimits UNLIMITED = (direction, rotation, flip) -> true;
 
+    /**
+     * Must be standing upright; i.e., top side of the block facing up.
+     */
+    IAlignmentLimits UPRIGHT = (direction, rotation, flip) -> direction.offsetY == 0
+            && (flip.isVerticallyFliped() ? rotation.isUpsideDown() : rotation.isNotRotated());
+
+    /**
+     * Can be in any orientation except upside down; i.e., top side of the block facing down.
+     */
+    IAlignmentLimits NOT_UPSIDE_DOWN = (direction, rotation, flip) -> direction.offsetY != 0
+            || (flip.isVerticallyFliped() ? !rotation.isNotRotated() : !rotation.isUpsideDown());
+
+    /**
+     * Front side of the block must be facing up.
+     */
+    IAlignmentLimits FACING_UP = (direction, rotation, flip) -> direction == ForgeDirection.UP;
+
     boolean isNewExtendedFacingValid(ForgeDirection direction, Rotation rotation, Flip flip);
 
     default boolean isNewExtendedFacingValid(ExtendedFacing alignment) {
-        return isNewExtendedFacingValid(
+        return isNewExtendedFacingValid(alignment.getDirection(), alignment.getRotation(), alignment.getFlip());
-                alignment.getDirection(),
-                alignment.getRotation(),
-                alignment.getFlip());
     }
 
     static IAlignmentLimits allowOnly(ExtendedFacing... allowedFacings) {
@@ -40,6 +59,7 @@ public interface IAlignmentLimits {
     }
 
     class Builder {
+
         protected final boolean[] validStates = new boolean[STATES_COUNT];
 
         private Builder() {}
@@ -57,12 +77,14 @@ public interface IAlignmentLimits {
         }
 
         public Builder deny(ForgeDirection fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = false);
+            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = false);
             return this;
         }
 
         public Builder allow(ForgeDirection fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = true);
+            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = true);
             return this;
         }
 
@@ -77,22 +99,26 @@ public interface IAlignmentLimits {
         }
 
         public Builder deny(Rotation fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = false);
+            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = false);
             return this;
         }
 
         public Builder allow(Rotation fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = true);
+            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = true);
             return this;
         }
 
         public Builder deny(Flip fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = false);
+            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = false);
             return this;
         }
 
         public Builder allow(Flip fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = true);
+            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = true);
             return this;
         }
 
@@ -113,7 +139,7 @@ public interface IAlignmentLimits {
         }
 
         /**
-         * Prefers rotation over flip, so both flip will get translated to opposite rotation and no flip
+         * Prefers rotation to flip, so both flip will get translated to opposite rotation and no flip
          *
          * @param flip the preferred flip to be used Horizontal or vertical
          * @return this

src/main/java/com/gtnewhorizon/structurelib/alignment/IAlignmentProvider.java

@@ -3,6 +3,7 @@ package com.gtnewhorizon.structurelib.alignment;
 import javax.annotation.Nullable;
 
 public interface IAlignmentProvider {
+
     @Nullable
     IAlignment getAlignment();
-}
+}

src/main/java/com/gtnewhorizon/structurelib/alignment/IntegerAxisSwap.java

@@ -1,13 +1,15 @@
 package com.gtnewhorizon.structurelib.alignment;
 
-import com.gtnewhorizon.structurelib.util.Vec3Impl;
-import com.gtnewhorizon.structurelib.alignment.enumerable.Direction;
-import net.minecraft.util.Vec3;
-import net.minecraftforge.common.util.ForgeDirection;
-
 import static java.lang.Math.abs;
 
+import net.minecraft.util.Vec3;
+import net.minecraftforge.common.util.ForgeDirection;
+
+import com.gtnewhorizon.structurelib.alignment.enumerable.Direction;
+import com.gtnewhorizon.structurelib.util.Vec3Impl;
+
 public class IntegerAxisSwap {
+
     private final Vec3Impl forFirstAxis;
     private final Vec3Impl forSecondAxis;
     private final Vec3Impl forThirdAxis;
@@ -16,69 +18,77 @@ public class IntegerAxisSwap {
         this.forFirstAxis = Direction.getAxisVector(forFirstAxis);
         this.forSecondAxis = Direction.getAxisVector(forSecondAxis);
         this.forThirdAxis = Direction.getAxisVector(forThirdAxis);
-        if(abs(this.forFirstAxis.get0())+abs(this.forSecondAxis.get0())+abs(this.forThirdAxis.get0())!=1 ||
+        if (abs(this.forFirstAxis.get0()) + abs(this.forSecondAxis.get0()) + abs(this.forThirdAxis.get0()) != 1
-                abs(this.forFirstAxis.get1())+abs(this.forSecondAxis.get1())+abs(this.forThirdAxis.get1())!=1 ||
+                || abs(this.forFirstAxis.get1()) + abs(this.forSecondAxis.get1()) + abs(this.forThirdAxis.get1()) != 1
-                abs(this.forFirstAxis.get2())+abs(this.forSecondAxis.get2())+abs(this.forThirdAxis.get2())!=1){
+                || abs(this.forFirstAxis.get2()) + abs(this.forSecondAxis.get2()) + abs(this.forThirdAxis.get2())
-            throw new IllegalArgumentException("Axis are overlapping/missing! "+
+                        != 1) {
-                    forFirstAxis.name()+" "+
+            throw new IllegalArgumentException(
-                    forSecondAxis.name()+" "+
+                    "Axis are overlapping/missing! " + forFirstAxis
-                    forThirdAxis.name());
+                            .name() + " " + forSecondAxis.name() + " " + forThirdAxis.name());
         }
     }
 
-    public Vec3Impl translate(Vec3Impl point){
+    public Vec3Impl translate(Vec3Impl point) {
         return new Vec3Impl(
-                forFirstAxis.get0()*point.get0() +forFirstAxis.get1()*point.get1() +forFirstAxis.get2()*point.get2(),
+                forFirstAxis.get0() * point.get0() + forFirstAxis.get1() * point.get1()
-                forSecondAxis.get0()*point.get0()+forSecondAxis.get1()*point.get1()+forSecondAxis.get2()*point.get2(),
+                        + forFirstAxis.get2() * point.get2(),
-                forThirdAxis.get0()*point.get0() +forThirdAxis.get1()*point.get1() +forThirdAxis.get2()*point.get2()
+                forSecondAxis.get0() * point.get0() + forSecondAxis.get1() * point.get1()
-        );
+                        + forSecondAxis.get2() * point.get2(),
+                forThirdAxis.get0() * point.get0() + forThirdAxis.get1() * point.get1()
+                        + forThirdAxis.get2() * point.get2());
     }
 
-    public Vec3Impl inverseTranslate(Vec3Impl point){
+    public Vec3Impl inverseTranslate(Vec3Impl point) {
         return new Vec3Impl(
-                forFirstAxis.get0()*point.get0()+forSecondAxis.get0()*point.get1()+forThirdAxis.get0()*point.get2(),
+                forFirstAxis.get0() * point.get0() + forSecondAxis.get0() * point.get1()
-                forFirstAxis.get1()*point.get0()+forSecondAxis.get1()*point.get1()+forThirdAxis.get1()*point.get2(),
+                        + forThirdAxis.get0() * point.get2(),
-                forFirstAxis.get2()*point.get0()+forSecondAxis.get2()*point.get1()+forThirdAxis.get2()*point.get2()
+                forFirstAxis.get1() * point.get0() + forSecondAxis.get1() * point.get1()
-        );
+                        + forThirdAxis.get1() * point.get2(),
+                forFirstAxis.get2() * point.get0() + forSecondAxis.get2() * point.get1()
+                        + forThirdAxis.get2() * point.get2());
     }
 
-    public Vec3 translate(Vec3 point){
+    public Vec3 translate(Vec3 point) {
         return Vec3.createVectorHelper(
-                forFirstAxis.get0()*point.xCoord +forFirstAxis.get1()*point.yCoord +forFirstAxis.get2()*point.zCoord,
+                forFirstAxis.get0() * point.xCoord + forFirstAxis.get1() * point.yCoord
-                forSecondAxis.get0()*point.xCoord+forSecondAxis.get1()*point.yCoord+forSecondAxis.get2()*point.zCoord,
+                        + forFirstAxis.get2() * point.zCoord,
-                forThirdAxis.get0()*point.xCoord +forThirdAxis.get1()*point.yCoord +forThirdAxis.get2()*point.zCoord
+                forSecondAxis.get0() * point.xCoord + forSecondAxis.get1() * point.yCoord
-        );
+                        + forSecondAxis.get2() * point.zCoord,
+                forThirdAxis.get0() * point.xCoord + forThirdAxis.get1() * point.yCoord
+                        + forThirdAxis.get2() * point.zCoord);
     }
 
-    public Vec3 inverseTranslate(Vec3 point){
+    public Vec3 inverseTranslate(Vec3 point) {
         return Vec3.createVectorHelper(
-                forFirstAxis.get0()*point.xCoord+forSecondAxis.get0()*point.yCoord+forThirdAxis.get0()*point.zCoord,
+                forFirstAxis.get0() * point.xCoord + forSecondAxis.get0() * point.yCoord
-                forFirstAxis.get1()*point.xCoord+forSecondAxis.get1()*point.yCoord+forThirdAxis.get1()*point.zCoord,
+                        + forThirdAxis.get0() * point.zCoord,
-                forFirstAxis.get2()*point.xCoord+forSecondAxis.get2()*point.yCoord+forThirdAxis.get2()*point.zCoord
+                forFirstAxis.get1() * point.xCoord + forSecondAxis.get1() * point.yCoord
-        );
+                        + forThirdAxis.get1() * point.zCoord,
-    }
+                forFirstAxis.get2() * point.xCoord + forSecondAxis.get2() * point.yCoord
-    
+                        + forThirdAxis.get2() * point.zCoord);
-    public void translate(int[] point,int[] out){
-        out[0]=forFirstAxis.get0()*point[0] +forFirstAxis.get1()*point[1] +forFirstAxis.get2()*point[2];
-        out[1]=forSecondAxis.get0()*point[0]+forSecondAxis.get1()*point[1]+forSecondAxis.get2()*point[2];
-        out[2]=forThirdAxis.get0()*point[0] +forThirdAxis.get1()*point[1] +forThirdAxis.get2()*point[2];
     }
 
-    public void inverseTranslate(int[] point,int[] out){
+    public void translate(int[] point, int[] out) {
-        out[0]=forFirstAxis.get0()*point[0]+forSecondAxis.get0()*point[1]+forThirdAxis.get0()*point[2];
+        out[0] = forFirstAxis.get0() * point[0] + forFirstAxis.get1() * point[1] + forFirstAxis.get2() * point[2];
-        out[1]=forFirstAxis.get1()*point[0]+forSecondAxis.get1()*point[1]+forThirdAxis.get1()*point[2];
+        out[1] = forSecondAxis.get0() * point[0] + forSecondAxis.get1() * point[1] + forSecondAxis.get2() * point[2];
-        out[2]=forFirstAxis.get2()*point[0]+forSecondAxis.get2()*point[1]+forThirdAxis.get2()*point[2];
+        out[2] = forThirdAxis.get0() * point[0] + forThirdAxis.get1() * point[1] + forThirdAxis.get2() * point[2];
     }
 
-    public void translate(double[] point,double[] out){
+    public void inverseTranslate(int[] point, int[] out) {
-        out[0]=forFirstAxis.get0()*point[0] +forFirstAxis.get1()*point[1] +forFirstAxis.get2()*point[2];
+        out[0] = forFirstAxis.get0() * point[0] + forSecondAxis.get0() * point[1] + forThirdAxis.get0() * point[2];
-        out[1]=forSecondAxis.get0()*point[0]+forSecondAxis.get1()*point[1]+forSecondAxis.get2()*point[2];
+        out[1] = forFirstAxis.get1() * point[0] + forSecondAxis.get1() * point[1] + forThirdAxis.get1() * point[2];
-        out[2]=forThirdAxis.get0()*point[0] +forThirdAxis.get1()*point[1] +forThirdAxis.get2()*point[2];
+        out[2] = forFirstAxis.get2() * point[0] + forSecondAxis.get2() * point[1] + forThirdAxis.get2() * point[2];
     }
 
-    public void inverseTranslate(double[] point,double[] out){
+    public void translate(double[] point, double[] out) {
-        out[0]=forFirstAxis.get0()*point[0]+forSecondAxis.get0()*point[1]+forThirdAxis.get0()*point[2];
+        out[0] = forFirstAxis.get0() * point[0] + forFirstAxis.get1() * point[1] + forFirstAxis.get2() * point[2];
-        out[1]=forFirstAxis.get1()*point[0]+forSecondAxis.get1()*point[1]+forThirdAxis.get1()*point[2];
+        out[1] = forSecondAxis.get0() * point[0] + forSecondAxis.get1() * point[1] + forSecondAxis.get2() * point[2];
-        out[2]=forFirstAxis.get2()*point[0]+forSecondAxis.get2()*point[1]+forThirdAxis.get2()*point[2];
+        out[2] = forThirdAxis.get0() * point[0] + forThirdAxis.get1() * point[1] + forThirdAxis.get2() * point[2];
+    }
+
+    public void inverseTranslate(double[] point, double[] out) {
+        out[0] = forFirstAxis.get0() * point[0] + forSecondAxis.get0() * point[1] + forThirdAxis.get0() * point[2];
+        out[1] = forFirstAxis.get1() * point[0] + forSecondAxis.get1() * point[1] + forThirdAxis.get1() * point[2];
+        out[2] = forFirstAxis.get2() * point[0] + forSecondAxis.get2() * point[1] + forThirdAxis.get2() * point[2];
     }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/ChannelDataAccessor.java

@@ -0,0 +1,177 @@
+package com.gtnewhorizon.structurelib.alignment.constructable;
+
+import static com.gtnewhorizon.structurelib.util.MiscUtils.getTagKeys;
+import static net.minecraftforge.common.util.Constants.NBT.TAG_COMPOUND;
+
+import java.util.Locale;
+import java.util.Map.Entry;
+import java.util.stream.Stream;
+
+import net.minecraft.init.Items;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraftforge.common.util.Constants.NBT;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.tuple.ImmutablePair;
+
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+
+/**
+ * Provide accessor methods for channel data from trigger item.
+ *
+ * <a href="{@docRoot}/overview-summary.html#channels">Channels section on overview</a>
+ */
+public class ChannelDataAccessor {
+
+    private static final String SECONDARY_HINT_TAG = "channels";
+
+    private ChannelDataAccessor() {}
+
+    /**
+     * Return a trigger item that
+     * <ul>
+     * <li>Still carry all the subchannel in some unspecified ways</li>
+     * <li>Have its master channel data replaced with specified subchannel's data</li>
+     * </ul>
+     *
+     * If given subchannel does not exist, masterStack may or may not be returned to save performance. Code within
+     * StructureLib can depend on this behavior, you cannot.
+     *
+     * @param masterStack trigger item. can be the return value of another {@link #withChannel(ItemStack, String)} call
+     * @param channel     subchannel to use. will use current master channel data instead if this channel does not exist
+     *                    Note: all channel identifiers are supposed to be lower case and not empty.
+     * @return a trigger item with new master channel
+     */
+    public static ItemStack withChannel(ItemStack masterStack, String channel) {
+        if (StringUtils.isEmpty(channel) || masterStack == null) throw new IllegalArgumentException();
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        if (!masterStack.hasTagCompound() || !masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)
+                || !masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).hasKey(channel, NBT.TAG_INT))
+            return masterStack;
+        ItemStack ret = new ItemStack(
+                masterStack.getItem(),
+                masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).getInteger(channel),
+                Items.feather.getDamage(masterStack));
+        ret.setTagCompound(masterStack.stackTagCompound);
+        return ret;
+    }
+
+    /**
+     * Check if given trigger item contains any subchannel
+     * 
+     * @param masterStack trigger stack to check
+     * @return true if contains any subchannel
+     */
+    public static boolean hasSubChannel(ItemStack masterStack) {
+        if (masterStack == null) throw new IllegalArgumentException();
+        return masterStack.hasTagCompound() && masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND);
+    }
+
+    /**
+     * Check if given trigger item contains specified subchannel
+     * 
+     * @param masterStack trigger stack to check
+     * @param channel     channel identifier. Note: all channel identifiers are supposed to be lower case and not empty.
+     * @return true if contains specified subchannel
+     */
+    public static boolean hasSubChannel(ItemStack masterStack, String channel) {
+        if (StringUtils.isEmpty(channel) || masterStack == null) throw new IllegalArgumentException();
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        return !channel.isEmpty() && masterStack.hasTagCompound()
+                && masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)
+                && masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).hasKey(channel, NBT.TAG_INT);
+    }
+
+    /**
+     * Get the subchannel data from given trigger item. Will use master channel instead if not present.
+     * 
+     * @param masterStack trigger stack to query from
+     * @param channel     channel identifier. Note: all channel identifiers are supposed to be lower case and not empty.
+     * @return channel data
+     */
+    public static int getChannelData(ItemStack masterStack, String channel) {
+        if (StringUtils.isEmpty(channel) || masterStack == null) throw new IllegalArgumentException();
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        if (!masterStack.hasTagCompound() || !masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)
+                || !masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).hasKey(channel, NBT.TAG_INT))
+            return masterStack.stackSize;
+        return masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).getInteger(channel);
+    }
+
+    /**
+     * Set the subchannel data on given trigger item
+     * 
+     * @param masterStack trigger stack to check
+     * @param channel     channel identifier. Note: all channel identifiers are supposed to be lower case and not empty.
+     * @param data        subchannel data. should always be a positive value
+     */
+    public static void setChannelData(ItemStack masterStack, String channel, int data) {
+        if (StringUtils.isEmpty(channel) || masterStack == null) throw new IllegalArgumentException();
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        if (data <= 0) throw new IllegalArgumentException();
+        if (masterStack.stackTagCompound == null) masterStack.stackTagCompound = new NBTTagCompound();
+        NBTTagCompound main = masterStack.stackTagCompound;
+        if (!main.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)) main.setTag(SECONDARY_HINT_TAG, new NBTTagCompound());
+        main.getCompoundTag(SECONDARY_HINT_TAG).setInteger(channel, data);
+    }
+
+    /**
+     * Clear the given subchannel from given trigger item, if it exists
+     * 
+     * @param masterStack trigger stack to unset
+     * @param channel     channel identifier. Note: all channel identifiers are supposed to be lower case and not empty.
+     */
+    public static void unsetChannelData(ItemStack masterStack, String channel) {
+        if (StringUtils.isEmpty(channel) || masterStack == null) throw new IllegalArgumentException();
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        if (masterStack.stackTagCompound == null) masterStack.stackTagCompound = new NBTTagCompound();
+        NBTTagCompound main = masterStack.stackTagCompound;
+        if (!main.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)) main.setTag(SECONDARY_HINT_TAG, new NBTTagCompound());
+        NBTTagCompound tag = main.getCompoundTag(SECONDARY_HINT_TAG);
+        tag.removeTag(channel);
+        if (tag.hasNoTags()) main.removeTag(SECONDARY_HINT_TAG);
+        if (main.hasNoTags()) masterStack.stackTagCompound = null;
+    }
+
+    /**
+     * Wipe all subchannel data on given trigger item
+     * 
+     * @param masterStack trigger stack to wipe
+     */
+    public static void wipeChannelData(ItemStack masterStack) {
+        if (masterStack == null) throw new IllegalArgumentException();
+        if (masterStack.stackTagCompound != null) masterStack.stackTagCompound.removeTag(SECONDARY_HINT_TAG);
+    }
+
+    /**
+     * Iterate over all subchannel data on trigger stack. Does not include master channel!!
+     * 
+     * @param masterStack trigger stack to check
+     * @return A java8 stream of pairs. Key is channel identifier and value is channel data. Pairs do not support
+     *         mutation nor removal. Can still cause {@link java.util.ConcurrentModificationException} if underlying
+     *         channel data is modified while stream is working.
+     */
+    public static Stream<Entry<String, Integer>> iterateChannelData(ItemStack masterStack) {
+        if (!hasSubChannel(masterStack)) return Stream.empty();
+        NBTTagCompound tag = masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG);
+        return getTagKeys(tag).stream().map(s -> new ImmutablePair<>(s, tag.getInteger(s)));
+    }
+
+    /**
+     * Get the number of subchannels present on given trigger item. Does not include master channel.
+     * 
+     * @param masterStack trigger stack to query from
+     * @return subchannel count
+     */
+    public static int countChannelData(ItemStack masterStack) {
+        if (!hasSubChannel(masterStack)) return 0;
+        NBTTagCompound tag = masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG);
+        return tag.func_150296_c().size();
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/ConstructableUtility.java

@@ -1,82 +1,116 @@
 package com.gtnewhorizon.structurelib.alignment.constructable;
 
-import com.gtnewhorizon.structurelib.StructureLib;
+import java.util.WeakHashMap;
-import com.gtnewhorizon.structurelib.StructureLibAPI;
+
-import com.gtnewhorizon.structurelib.alignment.IAlignment;
-import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.ChatComponentTranslation;
 import net.minecraft.world.World;
 import net.minecraftforge.common.util.FakePlayer;
 import net.minecraftforge.common.util.ForgeDirection;
 
+import com.gtnewhorizon.structurelib.ConfigurationHandler;
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+import com.gtnewhorizon.structurelib.alignment.IAlignment;
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.structure.IItemSource;
+import com.gtnewhorizon.structurelib.structure.ISurvivalBuildEnvironment;
+
 public class ConstructableUtility {
-    private ConstructableUtility() {
 
-    }
+    private static final WeakHashMap<EntityPlayerMP, Long> lastUse = new WeakHashMap<>();
+    private static long clientSideLastUse = 0;
 
-    public static boolean handle(ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ, int aSide) {
+    private ConstructableUtility() {}
+
+    public static boolean handle(ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ,
+            int aSide) {
         StructureLibAPI.startHinting(aWorld);
         boolean ret = handle0(aStack, aPlayer, aWorld, aX, aY, aZ, aSide);
         StructureLibAPI.endHinting(aWorld);
         return ret;
     }
 
-    private static boolean handle0(ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ, int aSide) {
+    private static boolean handle0(ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ,
+            int aSide) {
         TileEntity tTileEntity = aWorld.getTileEntity(aX, aY, aZ);
         if (tTileEntity == null || aPlayer instanceof FakePlayer) {
             return aPlayer instanceof EntityPlayerMP;
         }
         if (aPlayer instanceof EntityPlayerMP) {
-            //struct gen
+            // not sneaking - client side will generate hologram. nothing to do on server side
-            if (aPlayer.isSneaking() && aPlayer.capabilities.isCreativeMode) {
+            if (!aPlayer.isSneaking()) return true;
-                if (tTileEntity instanceof IConstructableProvider) {
+
-                    IConstructable constructable = ((IConstructableProvider) tTileEntity).getConstructable();
+            long timePast = System.currentTimeMillis() - getLastUseMilis(aPlayer);
-                    if (constructable != null) {
+            if (timePast < ConfigurationHandler.INSTANCE.getAutoPlaceInterval()) {
-                        constructable.construct(aStack, false);
+                aPlayer.addChatComponentMessage(
-                    }
+                        new ChatComponentTranslation(
-                } else if (tTileEntity instanceof IConstructable) {
+                                "item.structurelib.constructableTrigger.too_fast",
-                    ((IConstructable) tTileEntity).construct(aStack, false);
+                                ConfigurationHandler.INSTANCE.getAutoPlaceInterval() - timePast));
-                } else if (IMultiblockInfoContainer.contains(tTileEntity.getClass())) {
+                return true;
-                    IMultiblockInfoContainer<TileEntity> iMultiblockInfoContainer = IMultiblockInfoContainer.get(tTileEntity.getClass());
+            }
-                    if (tTileEntity instanceof IAlignment) {
+        } else if (!StructureLib.isCurrentPlayer(aPlayer)) {
-                        iMultiblockInfoContainer.construct(aStack, false, tTileEntity,
+            return false;
-                                ((IAlignment) tTileEntity).getExtendedFacing());
+        }
-                    } else {
+
-                        iMultiblockInfoContainer.construct(aStack, false, tTileEntity,
+        IConstructable constructable = null;
-                                ExtendedFacing.of(ForgeDirection.getOrientation(aSide)));
+        if (tTileEntity instanceof IConstructableProvider)
-                    }
+            constructable = ((IConstructableProvider) tTileEntity).getConstructable();
+        else if (tTileEntity instanceof IConstructable) {
+            constructable = (IConstructable) tTileEntity;
+        } else if (IMultiblockInfoContainer.contains(tTileEntity.getClass())) {
+            ExtendedFacing facing = tTileEntity instanceof IAlignment ? ((IAlignment) tTileEntity).getExtendedFacing()
+                    : ExtendedFacing.of(ForgeDirection.getOrientation(aSide));
+            constructable = IMultiblockInfoContainer.<TileEntity>get(tTileEntity.getClass())
+                    .toConstructable(tTileEntity, facing);
+        }
+
+        if (constructable == null) return false;
+
+        if (aPlayer instanceof EntityPlayerMP playerMP) {
+            // server side and sneaking (already checked above)
+            // do construct
+            if (aPlayer.capabilities.isCreativeMode) {
+                constructable.construct(aStack, false);
+            } else if (constructable instanceof ISurvivalConstructable) {
+                int built = ((ISurvivalConstructable) constructable).survivalConstruct(
+                        aStack,
+                        ConfigurationHandler.INSTANCE.getAutoPlaceBudget(),
+                        ISurvivalBuildEnvironment.create(IItemSource.fromPlayer(playerMP), playerMP));
+                if (built > 0) {
+                    playerMP.addChatMessage(new ChatComponentTranslation("structurelib.autoplace.built_stat", built));
+                } else if (built == -1) {
+                    playerMP.addChatMessage(new ChatComponentTranslation("structurelib.autoplace.complete"));
                 }
+                setLastUseMilis(aPlayer);
+            } else {
+                playerMP.addChatMessage(new ChatComponentTranslation("structurelib.autoplace.error.not_enabled"));
             }
             return true;
-        } else if (StructureLib.isCurrentPlayer(aPlayer)) {//particles and text client side
-            //if ((!aPlayer.isSneaking() || !aPlayer.capabilities.isCreativeMode)) {
-            if (tTileEntity instanceof IConstructableProvider) {
-                IConstructable constructable = ((IConstructableProvider) tTileEntity).getConstructable();
-                if (constructable != null) {
-                    constructable.construct(aStack, true);
-                    StructureLib.addClientSideChatMessages(constructable.getStructureDescription(aStack));
-                }
-            } else if (tTileEntity instanceof IConstructable) {
-                IConstructable constructable = (IConstructable) tTileEntity;
-                constructable.construct(aStack, true);
-                StructureLib.addClientSideChatMessages(constructable.getStructureDescription(aStack));
-                return false;
-            } else if (IMultiblockInfoContainer.contains(tTileEntity.getClass())) {
-                IMultiblockInfoContainer<TileEntity> iMultiblockInfoContainer = IMultiblockInfoContainer.get(tTileEntity.getClass());
-                if (tTileEntity instanceof IAlignment) {
-                    iMultiblockInfoContainer.construct(aStack, true, tTileEntity,
-                            ((IAlignment) tTileEntity).getExtendedFacing());
-                } else {
-                    iMultiblockInfoContainer.construct(aStack, true, tTileEntity,
-                            ExtendedFacing.of(ForgeDirection.getOrientation(aSide)));
-                }
-                StructureLib.addClientSideChatMessages(IMultiblockInfoContainer.get(tTileEntity.getClass()).getDescription(aStack));
-                return false;
-            }
         }
+        // client side
+        // particles and text
+        constructable.construct(aStack, true);
+        if (System.currentTimeMillis() - getLastUseMilis(aPlayer) >= 300)
+            StructureLib.addClientSideChatMessages(constructable.getStructureDescription(aStack));
+        setLastUseMilis(aPlayer);
         return false;
     }
+
+    private static void setLastUseMilis(EntityPlayer aPlayer) {
+        if (!(aPlayer instanceof EntityPlayerMP))
+            // assume client side
+            clientSideLastUse = System.currentTimeMillis();
+        else lastUse.put((EntityPlayerMP) aPlayer, System.currentTimeMillis());
+    }
+
+    private static long getLastUseMilis(EntityPlayer aPlayer) {
+        if (!(aPlayer instanceof EntityPlayerMP))
+            // assume client side
+            return clientSideLastUse;
+        return lastUse.getOrDefault(aPlayer, 0L);
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/IConstructable.java

@@ -1,16 +1,26 @@
 package com.gtnewhorizon.structurelib.alignment.constructable;
 
+import net.minecraft.item.ItemStack;
+
+import com.gtnewhorizon.structurelib.structure.IStructureDefinition;
+
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
-import net.minecraft.item.ItemStack;
 
 /**
  * Created by Tec on 24.03.2017.
  */
 public interface IConstructable {
+
     void construct(ItemStack stackSize, boolean hintsOnly);
 
+    /**
+     * Get the structure definition used for this constructable. Can be null if this constructable is not backed by one.
+     */
+    default IStructureDefinition<?> getStructureDefinition() {
+        return null;
+    }
+
     @SideOnly(Side.CLIENT)
     String[] getStructureDescription(ItemStack stackSize);
 }
-

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/IConstructableProvider.java

@@ -6,9 +6,10 @@ import javax.annotation.Nullable;
  * Implement this interface if this tile entity MIGHT be constructable
  */
 public interface IConstructableProvider {
-	/**
+
-	 * @return null if not constructable, an instance otherwise.
+    /**
-	 */
+     * @return null if not constructable, an instance otherwise.
-	@Nullable
+     */
-	IConstructable getConstructable();
+    @Nullable
+    IConstructable getConstructable();
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/IMultiblockInfoContainer.java

@@ -1,17 +1,25 @@
 package com.gtnewhorizon.structurelib.alignment.constructable;
 
-import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import java.util.HashMap;
-import cpw.mods.fml.relauncher.Side;
+
-import cpw.mods.fml.relauncher.SideOnly;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
+import net.minecraft.world.World;
 
-import java.util.HashMap;
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.structure.AutoPlaceEnvironment;
+import com.gtnewhorizon.structurelib.structure.IItemSource;
+import com.gtnewhorizon.structurelib.structure.ISurvivalBuildEnvironment;
+
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
 /**
  * To implement IConstructable on not own TileEntities
  */
 public interface IMultiblockInfoContainer<T> {
+
     HashMap<String, IMultiblockInfoContainer<?>> MULTIBLOCK_MAP = new HashMap<>();
 
     /**
@@ -33,6 +41,47 @@ public interface IMultiblockInfoContainer<T> {
 
     void construct(ItemStack stackSize, boolean hintsOnly, T tileEntity, ExtendedFacing aSide);
 
+    /**
+     * Construct the structure using
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)}
+     *
+     * @return -1 if done, a helping pointer
+     */
+    int survivalConstruct(ItemStack stackSize, int elementBudge, ISurvivalBuildEnvironment env, T tileEntity,
+            ExtendedFacing aSide);
+
     @SideOnly(Side.CLIENT)
     String[] getDescription(ItemStack stackSize);
+
+    default ISurvivalConstructable toConstructable(T tileEntity, ExtendedFacing aSide) {
+        return new ISurvivalConstructable() {
+
+            @Override
+            public int survivalConstruct(ItemStack stackSize, int elementBudget, ISurvivalBuildEnvironment env) {
+                return IMultiblockInfoContainer.this
+                        .survivalConstruct(stackSize, elementBudget, env, tileEntity, aSide);
+            }
+
+            @Override
+            public int survivalConstruct(ItemStack stackSize, int elementBudget, IItemSource source,
+                    EntityPlayerMP actor) {
+                return IMultiblockInfoContainer.this.survivalConstruct(
+                        stackSize,
+                        elementBudget,
+                        ISurvivalBuildEnvironment.create(source, actor),
+                        tileEntity,
+                        aSide);
+            }
+
+            @Override
+            public void construct(ItemStack stackSize, boolean hintsOnly) {
+                IMultiblockInfoContainer.this.construct(stackSize, hintsOnly, tileEntity, aSide);
+            }
+
+            @Override
+            public String[] getStructureDescription(ItemStack stackSize) {
+                return IMultiblockInfoContainer.this.getDescription(stackSize);
+            }
+        };
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/ISurvivalConstructable.java

@@ -0,0 +1,85 @@
+package com.gtnewhorizon.structurelib.alignment.constructable;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.structure.AutoPlaceEnvironment;
+import com.gtnewhorizon.structurelib.structure.IItemSource;
+import com.gtnewhorizon.structurelib.structure.ISurvivalBuildEnvironment;
+
+/**
+ * An extension to {@link IConstructable}. Tile Entities (or delegates returned by
+ * {@link IConstructableProvider#getConstructable()} should implement this interface to allow third party tools and
+ * StructureLib builtin constructable tools to trigger autoplace in survival mode.
+ * <p>
+ * While not originally planned, a creative player can also use this interface to trigger autoplace by using an
+ * {@link IItemSource} with every possible items in the game.
+ */
+public interface ISurvivalConstructable extends IConstructable {
+
+    /**
+     * End player might want to disable this hack if it turns out to be too crashy
+     */
+    boolean DISABLE_HACKY_MIGRATION_CODE = Boolean.getBoolean("structurelib.disable_isc_migration_hack");
+
+    /**
+     * Construct the structure using
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, IItemSource, EntityPlayerMP, java.util.function.Consumer)}
+     * or
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureDefinition#survivalBuild(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int, int, IItemSource, EntityPlayerMP, boolean)}
+     *
+     * @param elementBudget The server configured element budget. The implementor can choose to tune this up a bit if
+     *                      the structure is too big, but generally should not be a 4 digits number to not overwhelm the
+     *                      server
+     * @return -1 if done, otherwise number of elements placed this round
+     */
+    @Deprecated
+    default int survivalConstruct(ItemStack stackSize, int elementBudget, IItemSource source, EntityPlayerMP actor) {
+        return survivalConstruct(stackSize, elementBudget, ISurvivalBuildEnvironment.create(source, actor));
+    }
+
+    /**
+     * Construct the structure using
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)}
+     * or
+     * {@link com.gtnewhorizon.structurelib.structure.IStructureDefinition#survivalBuild(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int, int, ISurvivalBuildEnvironment, boolean)}
+     *
+     * @param elementBudget The server configured element budget. The implementor can choose to tune this up a bit if
+     *                      the structure is too big, but generally should not be a 4 digits number to not overwhelm the
+     *                      server
+     * @return -1 if done, -2 if not supported (e.g. due to an incompatible change in the API of env, otherwise number
+     *         of elements placed this round
+     */
+    default int survivalConstruct(ItemStack stackSize, int elementBudget, ISurvivalBuildEnvironment env) {
+        EntityPlayer actor = env.getActor();
+        if (actor instanceof EntityPlayerMP)
+            return survivalConstruct(stackSize, elementBudget, env.getSource(), (EntityPlayerMP) actor);
+        else if (!DISABLE_HACKY_MIGRATION_CODE && __get_player() == null) {
+            // as far as I know, no implementor would actually do anything to actor beyond passing it down to
+            // IStructureDefinition, so it's probably fine to proceed like this
+            GlobalStates.entityPlayer.set(env.getActor());
+            try {
+                return survivalConstruct(stackSize, elementBudget, env.getSource(), null);
+            } finally {
+                GlobalStates.entityPlayer.remove();
+            }
+        }
+        return -2;
+    }
+
+    /**
+     * Internal hack. Do not use.
+     */
+    @Deprecated
+    static EntityPlayer __get_player() {
+        return GlobalStates.entityPlayer.get();
+    }
+}
+
+class GlobalStates {
+
+    public static final ThreadLocal<EntityPlayer> entityPlayer = new ThreadLocal<>();
+}

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * This package contains interfaces and utility methods for autobuilding a structure.
+ */
+package com.gtnewhorizon.structurelib.alignment.constructable;

src/main/java/com/gtnewhorizon/structurelib/alignment/enumerable/Direction.java

@@ -1,9 +1,16 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import com.gtnewhorizon.structurelib.util.Vec3Impl;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
 import net.minecraftforge.common.util.ForgeDirection;
 
+import com.gtnewhorizon.structurelib.util.Vec3Impl;
+
 public enum Direction {
+
     DOWN(ForgeDirection.DOWN),
     UP(ForgeDirection.UP),
     NORTH(ForgeDirection.NORTH),
@@ -13,11 +20,13 @@ public enum Direction {
 
     private final ForgeDirection forgeDirection;
     private final Vec3Impl axisVector;
-    public static final Direction[] VALUES=values();
+    public static final Direction[] VALUES = values();
+    private static final Map<Vec3Impl, Direction> reverseMap = Arrays.stream(VALUES)
+            .collect(Collectors.toMap(d -> d.axisVector, Function.identity()));
 
     Direction(ForgeDirection forgeDirection) {
         this.forgeDirection = forgeDirection;
-        axisVector=new Vec3Impl(forgeDirection.offsetX,forgeDirection.offsetY,forgeDirection.offsetZ);
+        axisVector = Vec3Impl.getFromPool(forgeDirection.offsetX, forgeDirection.offsetY, forgeDirection.offsetZ);
     }
 
     public ForgeDirection getForgeDirection() {
@@ -28,7 +37,11 @@ public enum Direction {
         return axisVector;
     }
 
-    public static Vec3Impl getAxisVector(ForgeDirection forgeDirection){
+    public static Vec3Impl getAxisVector(ForgeDirection forgeDirection) {
         return VALUES[forgeDirection.ordinal()].axisVector;
     }
+
+    public static Direction getByAxisVector(Vec3Impl vec3) {
+        return reverseMap.get(vec3);
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/enumerable/ExtendedFacing.java

@@ -1,21 +1,33 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import com.google.common.collect.ImmutableSet;
-import com.gtnewhorizon.structurelib.alignment.IAlignment;
-import com.gtnewhorizon.structurelib.alignment.IntegerAxisSwap;
-import com.gtnewhorizon.structurelib.util.Vec3Impl;
-import net.minecraft.util.Vec3;
-import net.minecraftforge.common.util.ForgeDirection;
-
-import java.util.*;
-
 import static com.gtnewhorizon.structurelib.alignment.IAlignment.FLIPS_COUNT;
 import static com.gtnewhorizon.structurelib.alignment.IAlignment.ROTATIONS_COUNT;
 import static java.lang.Math.abs;
 import static java.util.Arrays.stream;
-import static java.util.stream.Collectors.*;
+import static java.util.stream.Collectors.collectingAndThen;
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.toMap;
+import static java.util.stream.Collectors.toSet;
+
+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+
+import net.minecraft.util.StatCollector;
+import net.minecraft.util.Vec3;
+import net.minecraftforge.common.util.ForgeDirection;
+
+import com.google.common.collect.ImmutableSet;
+import com.gtnewhorizon.structurelib.alignment.IAlignment;
+import com.gtnewhorizon.structurelib.alignment.IntegerAxisSwap;
+import com.gtnewhorizon.structurelib.util.Vec3Impl;
 
 public enum ExtendedFacing {
+
     DOWN_NORMAL_NONE("down normal none"),
     DOWN_NORMAL_HORIZONTAL("down normal horizontal"),
     DOWN_NORMAL_VERTICAL("down normal vertical"),
@@ -113,13 +125,14 @@ public enum ExtendedFacing {
     EAST_COUNTER_CLOCKWISE_VERTICAL("east counter clockwise vertical"),
     EAST_COUNTER_CLOCKWISE_BOTH("east counter clockwise both");
 
-    public static final ExtendedFacing DEFAULT=NORTH_NORMAL_NONE;
+    public static final ExtendedFacing DEFAULT = NORTH_NORMAL_NONE;
     public static final ExtendedFacing[] VALUES = values();
-    public static final Map<ForgeDirection, List<ExtendedFacing>> FOR_FACING=new HashMap<>();
+    public static final Map<ForgeDirection, List<ExtendedFacing>> FOR_FACING = new HashMap<>();
     public static final int STATES_COUNT = VALUES.length;
+
     static {
-        stream(values()).forEach(extendedFacing ->
+        stream(values()).forEach(
-                FOR_FACING.compute(extendedFacing.direction, ((forgeDirection, extendedFacings) -> {
+                extendedFacing -> FOR_FACING.compute(extendedFacing.direction, ((forgeDirection, extendedFacings) -> {
                     if (extendedFacings == null) {
                         extendedFacings = new ArrayList<>();
                     }
@@ -128,10 +141,24 @@ public enum ExtendedFacing {
                 })));
     }
 
-    private static final Map<String, ExtendedFacing> NAME_LOOKUP = stream(VALUES).collect(toMap(ExtendedFacing::getName2, (extendedFacing) -> extendedFacing));
+    private static final Map<String, ExtendedFacing> NAME_LOOKUP = stream(VALUES)
-    private static final EnumMap<ForgeDirection, ImmutableSet<ExtendedFacing>> LOOKUP_BY_DIRECTION = stream(VALUES).collect(groupingBy(ExtendedFacing::getDirection, () -> new EnumMap<>(ForgeDirection.class), collectingAndThen(toSet(), ImmutableSet::copyOf)));
+            .collect(toMap(ExtendedFacing::getName2, (extendedFacing) -> extendedFacing));
-    private static final EnumMap<Rotation, ImmutableSet<ExtendedFacing>> LOOKUP_BY_ROTATION = stream(VALUES).collect(groupingBy(ExtendedFacing::getRotation, () -> new EnumMap<>(Rotation.class), collectingAndThen(toSet(), ImmutableSet::copyOf)));
+    private static final EnumMap<ForgeDirection, ImmutableSet<ExtendedFacing>> LOOKUP_BY_DIRECTION = stream(VALUES)
-    private static final EnumMap<Flip, ImmutableSet<ExtendedFacing>> LOOKUP_BY_FLIP = stream(VALUES).collect(groupingBy(ExtendedFacing::getFlip, () -> new EnumMap<>(Flip.class), collectingAndThen(toSet(), ImmutableSet::copyOf)));
+            .collect(
+                    groupingBy(
+                            ExtendedFacing::getDirection,
+                            () -> new EnumMap<>(ForgeDirection.class),
+                            collectingAndThen(toSet(), ImmutableSet::copyOf)));
+    private static final EnumMap<Rotation, ImmutableSet<ExtendedFacing>> LOOKUP_BY_ROTATION = stream(VALUES).collect(
+            groupingBy(
+                    ExtendedFacing::getRotation,
+                    () -> new EnumMap<>(Rotation.class),
+                    collectingAndThen(toSet(), ImmutableSet::copyOf)));
+    private static final EnumMap<Flip, ImmutableSet<ExtendedFacing>> LOOKUP_BY_FLIP = stream(VALUES).collect(
+            groupingBy(
+                    ExtendedFacing::getFlip,
+                    () -> new EnumMap<>(Flip.class),
+                    collectingAndThen(toSet(), ImmutableSet::copyOf)));
     private final ForgeDirection direction;
     private final ForgeDirection a, b, c;
     private final Rotation rotation;
@@ -142,133 +169,146 @@ public enum ExtendedFacing {
 
     ExtendedFacing(String name) {
         this.name = name;
-        direction= Direction.VALUES[ordinal()/(ROTATIONS_COUNT*FLIPS_COUNT)].getForgeDirection();
+        direction = Direction.VALUES[ordinal() / (ROTATIONS_COUNT * FLIPS_COUNT)].getForgeDirection();
-        rotation=Rotation.VALUES[ordinal()/FLIPS_COUNT-direction.ordinal()*ROTATIONS_COUNT];
+        rotation = Rotation.VALUES[ordinal() / FLIPS_COUNT - direction.ordinal() * ROTATIONS_COUNT];
-        flip=Flip.VALUES[ordinal()%FLIPS_COUNT];
+        flip = Flip.VALUES[ordinal() % FLIPS_COUNT];
-        ForgeDirection a,b,c;
+        ForgeDirection a, b, c;
-        switch (direction){
+        switch (direction) {
             case DOWN:
-                a= ForgeDirection.WEST;
+                a = ForgeDirection.WEST;
-                b= ForgeDirection.SOUTH;
+                b = ForgeDirection.SOUTH;
-                c= ForgeDirection.UP;
+                c = ForgeDirection.UP;
                 break;
             case UP:
-                a= ForgeDirection.EAST;
+                a = ForgeDirection.EAST;
-                b= ForgeDirection.SOUTH;
+                b = ForgeDirection.SOUTH;
-                c= ForgeDirection.DOWN;
+                c = ForgeDirection.DOWN;
                 break;
             case NORTH:
-                a= ForgeDirection.WEST;
+                a = ForgeDirection.WEST;
-                b= ForgeDirection.DOWN;
+                b = ForgeDirection.DOWN;
-                c= ForgeDirection.SOUTH;
+                c = ForgeDirection.SOUTH;
                 break;
             case SOUTH:
-                a= ForgeDirection.EAST;
+                a = ForgeDirection.EAST;
-                b= ForgeDirection.DOWN;
+                b = ForgeDirection.DOWN;
-                c= ForgeDirection.NORTH;
+                c = ForgeDirection.NORTH;
                 break;
             case WEST:
-                a= ForgeDirection.SOUTH;
+                a = ForgeDirection.SOUTH;
-                b= ForgeDirection.DOWN;
+                b = ForgeDirection.DOWN;
-                c= ForgeDirection.EAST;
+                c = ForgeDirection.EAST;
                 break;
             case EAST:
-                a= ForgeDirection.NORTH;
+                a = ForgeDirection.NORTH;
-                b= ForgeDirection.DOWN;
+                b = ForgeDirection.DOWN;
-                c= ForgeDirection.WEST;
+                c = ForgeDirection.WEST;
                 break;
-            default:throw new RuntimeException("Is impossible...");
+            default:
+                throw new RuntimeException("Is impossible...");
         }
-        switch (flip){//This duplicates some axis swaps since flip boolean would do, but seems more convenient to use
+        switch (flip) { // This duplicates some axis swaps since flip boolean would do, but seems more convenient to use
             case HORIZONTAL:
-                a=a.getOpposite();
+                a = a.getOpposite();
                 break;
             case BOTH:
-                a=a.getOpposite();
+                a = a.getOpposite();
             case VERTICAL:
-                b=b.getOpposite();
+                b = b.getOpposite();
                 break;
-            case NONE: break;
+            case NONE:
-            default:throw new RuntimeException("Even more impossible...");
+                break;
+            default:
+                throw new RuntimeException("Even more impossible...");
         }
         switch (rotation) {
             case CLOCKWISE: {
-                ForgeDirection _a=a;
+                ForgeDirection _a = a;
-                a =b;
+                a = b;
-                b =_a.getOpposite();
+                b = _a.getOpposite();
                 break;
             }
             case UPSIDE_DOWN:
-                a=a.getOpposite();
+                a = a.getOpposite();
-                b=b.getOpposite();
+                b = b.getOpposite();
                 break;
             case COUNTER_CLOCKWISE: {
-                ForgeDirection _a=a;
+                ForgeDirection _a = a;
-                a =b.getOpposite();
+                a = b.getOpposite();
-                b =_a;
+                b = _a;
                 break;
             }
-            case NORMAL: break;
+            case NORMAL:
+                break;
             default:
                 throw new RuntimeException("More impossible...");
         }
-        this.a=a;
+        this.a = a;
-        this.b=b;
+        this.b = b;
-        this.c=c;
+        this.c = c;
-        integerAxisSwap =new IntegerAxisSwap(a,b,c);
+        integerAxisSwap = new IntegerAxisSwap(a, b, c);
     }
 
-    public static ExtendedFacing of(ForgeDirection direction, Rotation rotation, Flip flip){
+    public static ExtendedFacing of(ForgeDirection direction, Rotation rotation, Flip flip) {
-        if(direction==ForgeDirection.UNKNOWN){
+        if (direction == ForgeDirection.UNKNOWN) {
             return VALUES[IAlignment.getAlignmentIndex(ForgeDirection.NORTH, rotation, flip)];
         }
         return VALUES[IAlignment.getAlignmentIndex(direction, rotation, flip)];
     }
 
-    public static ExtendedFacing of(ForgeDirection direction){
+    public static ExtendedFacing of(ForgeDirection direction) {
-        if(direction==ForgeDirection.UNKNOWN){
+        if (direction == ForgeDirection.UNKNOWN) {
             return DEFAULT;
         }
         return VALUES[IAlignment.getAlignmentIndex(direction, Rotation.NORMAL, Flip.NONE)];
     }
 
-    public static ImmutableSet<ExtendedFacing> getAllWith(ForgeDirection direction) { return LOOKUP_BY_DIRECTION.get(direction);}
+    public static ImmutableSet<ExtendedFacing> getAllWith(ForgeDirection direction) {
-    public static ImmutableSet<ExtendedFacing> getAllWith(Rotation rotation) { return LOOKUP_BY_ROTATION.get(rotation);}
+        return LOOKUP_BY_DIRECTION.get(direction);
-    public static ImmutableSet<ExtendedFacing> getAllWith(Flip flip) { return LOOKUP_BY_FLIP.get(flip);}
-
-    public ExtendedFacing with(ForgeDirection direction){
-        return of(direction,rotation,flip);
     }
 
-    public ExtendedFacing with(Rotation rotation){
+    public static ImmutableSet<ExtendedFacing> getAllWith(Rotation rotation) {
-        return of(direction,rotation,flip);
+        return LOOKUP_BY_ROTATION.get(rotation);
     }
 
-    public ExtendedFacing with(Flip flip){
+    public static ImmutableSet<ExtendedFacing> getAllWith(Flip flip) {
-        return of(direction,rotation,flip);
+        return LOOKUP_BY_FLIP.get(flip);
+    }
+
+    public ExtendedFacing with(ForgeDirection direction) {
+        return of(direction, rotation, flip);
+    }
+
+    public ExtendedFacing with(Rotation rotation) {
+        return of(direction, rotation, flip);
+    }
+
+    public ExtendedFacing with(Flip flip) {
+        return of(direction, rotation, flip);
     }
 
     public ExtendedFacing getOppositeDirection() {
-        return of(direction.getOpposite(),rotation,flip);
+        return of(direction.getOpposite(), rotation, flip);
     }
 
     public ExtendedFacing getOppositeRotation() {
-        return of(direction,rotation.getOpposite(),flip);
+        return of(direction, rotation.getOpposite(), flip);
     }
 
     public ExtendedFacing getOppositeFlip() {
-        return of(direction,rotation,flip.getOpposite());
+        return of(direction, rotation, flip.getOpposite());
     }
 
     /**
      * Gets the same effective facing achieved by different rot/flip combo
+     *
      * @return same effective facing, but different enum value
      */
-    public ExtendedFacing getDuplicate(){
+    public ExtendedFacing getDuplicate() {
-        return of(direction,rotation.getOpposite(),flip.getOpposite());
+        return of(direction, rotation.getOpposite(), flip.getOpposite());
     }
 
-    public int getIndex(){
+    public int getIndex() {
         return ordinal();
     }
 
@@ -276,6 +316,10 @@ public enum ExtendedFacing {
         return this.name;
     }
 
+    public String getLocalizedName() {
+        return StatCollector.translateToLocal("structurelib.facing." + getIndex());
+    }
+
     public static ExtendedFacing byName(String name) {
         return name == null ? null : NAME_LOOKUP.get(name.toLowerCase(Locale.ROOT));
     }
@@ -301,40 +345,69 @@ public enum ExtendedFacing {
     }
 
     /**
-     * Translates relative to front facing offset  to  world offset
+     * Translates relative to front facing offset to world offset
-     * @param abcOffset A,B,C offset (facing relative  L-->R,U-->D,F-->B)
+     *
-     * @return X,Y,Z offset in world
+     * @param abcOffset A,B,C offset (facing relative {@code L-->R,U-->D,F-->B})
+     * @return X, Y, Z offset in world
      */
     public Vec3 getWorldOffset(Vec3 abcOffset) {
         return integerAxisSwap.inverseTranslate(abcOffset);
     }
+
     public Vec3Impl getWorldOffset(Vec3Impl abcOffset) {
         return integerAxisSwap.inverseTranslate(abcOffset);
     }
-    public void getWorldOffset(int[] point,int[] out){
+
-        integerAxisSwap.inverseTranslate(point,out);
+    public void getWorldOffset(int[] point, int[] out) {
-    }
+        integerAxisSwap.inverseTranslate(point, out);
-    public void getWorldOffset(double[] point,double[] out){
-        integerAxisSwap.inverseTranslate(point,out);
     }
 
+    public void getWorldOffset(double[] point, double[] out) {
+        integerAxisSwap.inverseTranslate(point, out);
+    }
 
     /**
-     * Translates world offset  to  relative front facing offset
+     * do note the ABC coordinate system is (X, -Y, Z).
-     * @param xyzOffset X,Y,Z offset in world
-     * @return A,B,C offset (facing relative  L-->R,U-->D,F-->B)
      */
-    public Vec3 getOffsetABC(Vec3 xyzOffset){
+    public ForgeDirection getWorldDirection(ForgeDirection abcDirection) {
+        switch (abcDirection) {
+            case NORTH:
+                return getRelativeForwardInWorld();
+            case SOUTH:
+                return getRelativeBackInWorld();
+            case UP:
+                return getRelativeDownInWorld();
+            case DOWN:
+                return getRelativeUpInWorld();
+            case EAST:
+                return getRelativeLeftInWorld();
+            case WEST:
+                return getRelativeRightInWorld();
+            default:
+                return ForgeDirection.UNKNOWN;
+        }
+    }
+
+    /**
+     * Translates world offset to relative front facing offset
+     *
+     * @param xyzOffset X,Y,Z offset in world
+     * @return A, B, C offset (facing relative {@code L-->R,U-->D,F-->B})
+     */
+    public Vec3 getOffsetABC(Vec3 xyzOffset) {
         return integerAxisSwap.translate(xyzOffset);
     }
-    public Vec3Impl getOffsetABC(Vec3Impl xyzOffset){
+
+    public Vec3Impl getOffsetABC(Vec3Impl xyzOffset) {
         return integerAxisSwap.translate(xyzOffset);
     }
-    public void getOffsetABC(int[] point,int[] out){
+
-        integerAxisSwap.translate(point,out);
+    public void getOffsetABC(int[] point, int[] out) {
+        integerAxisSwap.translate(point, out);
     }
-    public void getOffsetABC(double[] point,double[] out){
+
-        integerAxisSwap.translate(point,out);
+    public void getOffsetABC(double[] point, double[] out) {
+        integerAxisSwap.translate(point, out);
     }
 
     public IntegerAxisSwap getIntegerAxisSwap() {

src/main/java/com/gtnewhorizon/structurelib/alignment/enumerable/Flip.java

@@ -1,15 +1,17 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import javax.annotation.Nonnull;
-import java.util.Locale;
-import java.util.Map;
-import java.util.Random;
-
 import static java.lang.Math.abs;
 import static java.util.Arrays.stream;
 import static java.util.stream.Collectors.toMap;
 
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+
+import javax.annotation.Nonnull;
+
 public enum Flip {
+
     NONE(3, "none"),
     HORIZONTAL(2, "horizontal"),
     VERTICAL(1, "vertical"),
@@ -26,7 +28,7 @@ public enum Flip {
         this.name = nameIn;
     }
 
-    public int getIndex(){
+    public int getIndex() {
         return ordinal();
     }
 
@@ -58,19 +60,19 @@ public enum Flip {
         return this.name;
     }
 
-    public boolean isNotFlipped(){
+    public boolean isNotFlipped() {
-        return this==NONE;
+        return this == NONE;
     }
 
-    public boolean isBothFlipped(){
+    public boolean isBothFlipped() {
-        return this==BOTH;
+        return this == BOTH;
     }
 
     public boolean isHorizontallyFlipped() {
-        return this==HORIZONTAL || isBothFlipped();
+        return this == HORIZONTAL || isBothFlipped();
     }
 
     public boolean isVerticallyFliped() {
-        return this==VERTICAL || isBothFlipped();
+        return this == VERTICAL || isBothFlipped();
     }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/enumerable/Rotation.java

@@ -1,15 +1,17 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import javax.annotation.Nonnull;
-import java.util.Locale;
-import java.util.Map;
-import java.util.Random;
-
 import static java.lang.Math.abs;
 import static java.util.Arrays.stream;
 import static java.util.stream.Collectors.toMap;
 
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+
+import javax.annotation.Nonnull;
+
 public enum Rotation {
+
     NORMAL(2, "normal"),
     CLOCKWISE(3, "clockwise"),
     UPSIDE_DOWN(0, "upside down"),
@@ -19,14 +21,15 @@ public enum Rotation {
     private final String name;
 
     public static final Rotation[] VALUES = values();
-    private static final Map<String, Rotation> NAME_LOOKUP = stream(VALUES).collect(toMap(Rotation::getName2, (rotation) -> rotation));
+    private static final Map<String, Rotation> NAME_LOOKUP = stream(VALUES)
+            .collect(toMap(Rotation::getName2, (rotation) -> rotation));
 
     Rotation(int oppositeIn, String nameIn) {
         this.opposite = oppositeIn;
         this.name = nameIn;
     }
 
-    public int getIndex(){
+    public int getIndex() {
         return ordinal();
     }
 
@@ -58,19 +61,19 @@ public enum Rotation {
         return this.name;
     }
 
-    public boolean isNotRotated(){
+    public boolean isNotRotated() {
-        return this==NORMAL;
+        return this == NORMAL;
     }
 
-    public boolean isClockwise(){
+    public boolean isClockwise() {
-        return this==CLOCKWISE;
+        return this == CLOCKWISE;
     }
 
-    public boolean isCounterClockwise(){
+    public boolean isCounterClockwise() {
-        return this==COUNTER_CLOCKWISE;
+        return this == COUNTER_CLOCKWISE;
     }
 
-    public boolean isUpsideDown(){
+    public boolean isUpsideDown() {
-        return this==UPSIDE_DOWN;
+        return this == UPSIDE_DOWN;
     }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/package-info.java

@@ -1,5 +1,7 @@
 /**
- * All public stuff in this package and its subpackages are considered part of the public API.
+ * This package provide a framework for rotating a given block, or a multiblock structure.
- * Backwards compatibility is maintained to the maximum extend possible.
+ * <p>
+ * All public stuff in this package and its subpackages are considered part of the public API. Backwards compatibility
+ * is maintained to the maximum extend possible.
  */
-package com.gtnewhorizon.structurelib.alignment;
+package com.gtnewhorizon.structurelib.alignment;

src/main/java/com/gtnewhorizon/structurelib/block/BlockHint.java

@@ -1,9 +1,7 @@
 package com.gtnewhorizon.structurelib.block;
 
-import com.gtnewhorizon.structurelib.StructureLib;
+import java.util.List;
-import com.gtnewhorizon.structurelib.StructureLibAPI;
+
-import cpw.mods.fml.relauncher.Side;
-import cpw.mods.fml.relauncher.SideOnly;
 import net.minecraft.block.Block;
 import net.minecraft.block.material.Material;
 import net.minecraft.client.renderer.texture.IIconRegister;
@@ -13,55 +11,63 @@ import net.minecraft.item.ItemStack;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.IBlockAccess;
 
-import java.util.List;
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
 public class BlockHint extends Block {
-	private static final IIcon[] hint = new IIcon[16];
 
-	public BlockHint() {
+    private static final IIcon[] hint = new IIcon[16];
-		super(Material.iron);
-		setBlockName("structurelib.blockhint");
-		setCreativeTab(StructureLib.creativeTab);
-	}
 
-	@Override
+    public BlockHint() {
-	public void registerBlockIcons(IIconRegister aIconRegister) {
+        super(Material.iron);
-		//super.registerBlockIcons(aIconRegister);
+        setBlockName("structurelib.blockhint");
-		hint[0] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_0");
+        setCreativeTab(StructureLib.creativeTab);
-		hint[1] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_1");
+    }
-		hint[2] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_2");
-		hint[3] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_3");
-		hint[4] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_4");
-		hint[5] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_5");
-		hint[6] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_6");
-		hint[7] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_7");
-		hint[8] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_8");
-		hint[9] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_9");
-		hint[10] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_10");
-		hint[11] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_11");
-		hint[12] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_DEFAULT");
-		hint[13] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_AIR");
-		hint[14] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_NOAIR");
-		hint[15] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_ERROR");
-	}
 
-	@Override
+    @Override
-	public IIcon getIcon(int aSide, int aMeta) {
+    public void registerBlockIcons(IIconRegister aIconRegister) {
-		return hint[aMeta];
+        // super.registerBlockIcons(aIconRegister);
-	}
+        hint[0] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_0");
+        hint[1] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_1");
+        hint[2] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_2");
+        hint[3] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_3");
+        hint[4] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_4");
+        hint[5] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_5");
+        hint[6] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_6");
+        hint[7] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_7");
+        hint[8] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_8");
+        hint[9] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_9");
+        hint[10] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_10");
+        hint[11] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_11");
+        hint[12] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_DEFAULT");
+        hint[13] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_AIR");
+        hint[14] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_NOAIR");
+        hint[15] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_ERROR");
+    }
 
-	@Override
+    @Override
-	@SideOnly(Side.CLIENT)
+    public IIcon getIcon(int aSide, int aMeta) {
-	public IIcon getIcon(IBlockAccess aWorld, int xCoord, int yCoord, int zCoord, int aSide) {
+        // For numbered hints, top and bottom are blank
-		int tMeta = aWorld.getBlockMetadata(xCoord, yCoord, zCoord);
+        if (aSide <= 1 && aMeta <= 11) {
-		return getIcon(aSide, tMeta);
+            return hint[13];
-	}
+        }
+        return hint[aMeta];
+    }
 
-	@Override
+    @Override
-	@SuppressWarnings("unchecked")
+    @SideOnly(Side.CLIENT)
-	public void getSubBlocks(Item aItem, CreativeTabs par2CreativeTabs, List aList) {
+    public IIcon getIcon(IBlockAccess aWorld, int xCoord, int yCoord, int zCoord, int aSide) {
-		for (int i = 0; i <= 15; i++) {
+        int tMeta = aWorld.getBlockMetadata(xCoord, yCoord, zCoord);
-			aList.add(new ItemStack(aItem, 1, i));
+        return getIcon(aSide, tMeta);
-		}
+    }
-	}
+
+    @Override
+    public void getSubBlocks(Item item, CreativeTabs tab, List<ItemStack> list) {
+        for (int i = 0; i <= 15; i++) {
+            list.add(new ItemStack(item, 1, i));
+        }
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/command/CommandConfigureChannels.java

@@ -0,0 +1,119 @@
+package com.gtnewhorizon.structurelib.command;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import net.minecraft.command.CommandBase;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.command.WrongUsageException;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ChatComponentText;
+import net.minecraft.util.ChatComponentTranslation;
+
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+
+public class CommandConfigureChannels extends CommandBase {
+
+    @Override
+    public String getCommandName() {
+        return "sl_channel";
+    }
+
+    @Override
+    public String getCommandUsage(ICommandSender p_71518_1_) {
+        return "/sl_channel <wipe/getall>\n" + "/sl_channel <get/unset> <channel name>\n"
+                + "/sl_channel <set> <channel name> <value>\n"
+                + "<channel name> can have space in it. <value> must be positive integer";
+    }
+
+    @Override
+    public int getRequiredPermissionLevel() {
+        return 0;
+    }
+
+    @Override
+    public List<String> addTabCompletionOptions(ICommandSender p_71516_1_, String[] p_71516_2_) {
+        if (p_71516_2_.length == 1)
+            return getListOfStringsMatchingLastWord(p_71516_2_, "get", "set", "unset", "wipe", "getall");
+        return null;
+    }
+
+    @Override
+    public void processCommand(ICommandSender sender, String[] args) {
+        if (args.length == 0) throw new WrongUsageException(getCommandUsage(sender));
+
+        if (!(sender instanceof EntityPlayerMP player)) throw new WrongUsageException("must be a player");
+
+        ItemStack heldItem = player.getHeldItem();
+        if (heldItem == null || !(heldItem.getItem() instanceof ItemConstructableTrigger)) {
+            throw new WrongUsageException("must hold a hologram");
+        }
+
+        String channel;
+
+        switch (args[0]) {
+            case "getall":
+                if (!ChannelDataAccessor.hasSubChannel(heldItem)) {
+                    sender.addChatMessage(new ChatComponentText("No subchannel"));
+                } else {
+                    sender.addChatMessage(
+                            new ChatComponentTranslation(
+                                    "item.structurelib.constructableTrigger.desc.lshift.0",
+                                    ChannelDataAccessor.countChannelData(heldItem)));
+                    ChannelDataAccessor.iterateChannelData(heldItem).map(e -> e.getKey() + ": " + e.getValue())
+                            .map(ChatComponentText::new).forEach(player::addChatMessage);
+                }
+                return;
+            case "wipe":
+                ChannelDataAccessor.wipeChannelData(heldItem);
+                return;
+            case "get":
+            case "unset":
+                if (args.length < 2) throw new WrongUsageException(getCommandUsage(sender));
+                channel = args.length == 2 ? args[1] : Arrays.stream(args).skip(1).collect(Collectors.joining());
+                break;
+            case "set":
+                if (args.length < 3) throw new WrongUsageException(getCommandUsage(sender));
+                channel = args.length == 3 ? args[1]
+                        : Arrays.stream(args).skip(1).limit(args.length - 2).collect(Collectors.joining());
+                break;
+            default:
+                throw new WrongUsageException(getCommandUsage(sender));
+        }
+
+        switch (args[0]) {
+            case "get":
+                if (ChannelDataAccessor.hasSubChannel(heldItem, channel)) sender.addChatMessage(
+                        new ChatComponentText(
+                                channel + " value: " + ChannelDataAccessor.getChannelData(heldItem, channel)));
+                else sender.addChatMessage(new ChatComponentText(channel + " value: N/A"));
+                break;
+            case "clear":
+                if (ChannelDataAccessor.hasSubChannel(heldItem, channel))
+                    sender.addChatMessage(new ChatComponentText(channel + " no value"));
+                else {
+                    ChannelDataAccessor.unsetChannelData(heldItem, channel);
+                    sender.addChatMessage(new ChatComponentText(channel + " cleared"));
+                    player.inventoryContainer.detectAndSendChanges();
+                }
+                break;
+            case "set":
+                int value;
+                try {
+                    value = Integer.parseInt(args[args.length - 1]);
+                } catch (NumberFormatException e) {
+                    throw new WrongUsageException("%s not a valid value", args[args.length - 1]);
+                }
+
+                if (value <= 0) throw new WrongUsageException("%s not a valid value", args[args.length - 1]);
+
+                ChannelDataAccessor.setChannelData(heldItem, channel, value);
+                player.inventoryContainer.detectAndSendChanges();
+                sender.addChatMessage(new ChatComponentText(channel + " value: " + value));
+                break;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/command/CommandRegistryDebug.java

@@ -0,0 +1,50 @@
+package com.gtnewhorizon.structurelib.command;
+
+import java.util.List;
+
+import net.minecraft.command.CommandBase;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.command.WrongUsageException;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.util.ChatComponentText;
+
+import com.gtnewhorizon.structurelib.SortedRegistry;
+
+public class CommandRegistryDebug extends CommandBase {
+
+    @Override
+    public String getCommandName() {
+        return "sl_registry_debug";
+    }
+
+    @Override
+    public String getCommandUsage(ICommandSender p_71518_1_) {
+        return "/sl_registry_debug <registry name>";
+    }
+
+    @Override
+    public int getRequiredPermissionLevel() {
+        return 0;
+    }
+
+    @Override
+    public List<String> addTabCompletionOptions(ICommandSender p_71516_1_, String[] p_71516_2_) {
+        if (p_71516_2_.length == 1) return getListOfStringsMatchingLastWord(
+                p_71516_2_,
+                SortedRegistry.getRegistryNames().toArray(new String[0]));
+        return null;
+    }
+
+    @Override
+    public void processCommand(ICommandSender sender, String[] args) {
+        if (args.length != 1) throw new WrongUsageException(getCommandUsage(sender));
+
+        if (!(sender instanceof EntityPlayerMP player)) throw new WrongUsageException("must be a player");
+
+        SortedRegistry<?> registry = SortedRegistry.getRegistry(args[0]);
+        if (registry == null) throw new WrongUsageException("registry not found");
+
+        player.addChatMessage(new ChatComponentText("Current order:"));
+        registry.getPlayerOrderingKeys(player).map(ChatComponentText::new).forEach(player::addChatMessage);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/core/StructureLibCore.java

@@ -0,0 +1,49 @@
+package com.gtnewhorizon.structurelib.core;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
+
+import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
+
+@IFMLLoadingPlugin.MCVersion("1.7.10")
+public class StructureLibCore implements IFMLLoadingPlugin, IEarlyMixinLoader {
+
+    @Override
+    public String[] getASMTransformerClass() {
+        return null;
+    }
+
+    @Override
+    public String getModContainerClass() {
+        return null;
+    }
+
+    @Override
+    public String getSetupClass() {
+        return null;
+    }
+
+    @Override
+    public void injectData(Map<String, Object> data) {
+
+    }
+
+    @Override
+    public String getAccessTransformerClass() {
+        return null;
+    }
+
+    @Override
+    public String getMixinConfig() {
+        return "mixins.structurelib.early.json";
+    }
+
+    @Override
+    public List<String> getMixins(Set<String> loadedCoreMods) {
+        return Arrays.asList("blockChangeNotifier.MixinForgeHooks", "blockChangeNotifier.MixinWorld");
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/entity/fx/EntityFXBlockHint.java

@@ -1,140 +0,0 @@
-package com.gtnewhorizon.structurelib.entity.fx;
-
-import com.gtnewhorizon.structurelib.StructureLib;
-import com.gtnewhorizon.structurelib.proxy.ClientProxy;
-import cpw.mods.fml.relauncher.Side;
-import cpw.mods.fml.relauncher.SideOnly;
-import net.minecraft.block.Block;
-import net.minecraft.client.particle.EntityFX;
-import net.minecraft.client.renderer.Tessellator;
-import net.minecraft.init.Blocks;
-import net.minecraft.util.IIcon;
-import net.minecraft.world.World;
-import org.lwjgl.opengl.GL11;
-
-@SideOnly(Side.CLIENT)
-public class EntityFXBlockHint extends EntityFX {
-    private IIcon[] icons;
-    private short[] mRGBa = {255,255,255,0};
-
-    public EntityFXBlockHint(World world){
-        this(world,0,0,0, Blocks.stone,0);
-    }
-
-    /**
-     *
-     * @param world
-     * @param x
-     * @param y
-     * @param z
-     * @param icons DOWN, UP, NORTH, SOUTH, WEST, EAST
-     */
-    public EntityFXBlockHint(World world, int x, int y, int z, IIcon[] icons) {
-        super(world, x + .25, y + .5, z + .25);
-        particleGravity = 0;
-        prevPosX = posX;
-        prevPosY = posY;
-        prevPosZ = posZ;
-        noClip = true;
-        particleMaxAge = 2000 + StructureLib.RANDOM.nextInt(200);
-        this.icons=icons;
-    }
-
-    public EntityFXBlockHint(World world, int x, int y, int z, Block block, int meta) {
-        super(world, x+.25, y+.5, z+.25);
-        particleGravity = 0;
-        prevPosX = posX;
-        prevPosY = posY;
-        prevPosZ = posZ;
-        noClip = true;
-        particleMaxAge = 2000 + StructureLib.RANDOM.nextInt(200);
-        icons = new IIcon[6];
-        for (int i = 0; i < 6; i++) {
-            icons[i] = block.getIcon(i, meta);
-        }
-    }
-
-    public EntityFXBlockHint withColorTint(short[] coloure){
-        this.mRGBa =coloure;
-        return this;
-    }
-
-    @Override
-    public void renderParticle(Tessellator tes, float subTickTime, float p_70539_3_, float p_70539_4_, float p_70539_5_, float p_70539_6_, float p_70539_7_) {
-        float size = .5f;
-        float X = (float) (prevPosX + (posX - prevPosX) * (double) subTickTime - EntityFX.interpPosX);
-        float Y = (float) (prevPosY + (posY - prevPosY) * (double) subTickTime - EntityFX.interpPosY) - size / 2;
-        float Z = (float) (prevPosZ + (posZ - prevPosZ) * (double) subTickTime - EntityFX.interpPosZ);
-        GL11.glDisable(GL11.GL_CULL_FACE);
-        GL11.glDepthMask(false);
-        tes.setColorRGBA((int) (mRGBa[0] * .9F), (int) (mRGBa[1] * .95F), (int) (mRGBa[2] * 1F), 192);
-
-        //var8, var9 - X U
-        //var 10, var 11 - Y V
-        for(int i=0;i<6;i++){
-            if(icons[i]==null) {
-                continue;
-            }
-            double u=icons[i].getMinU();
-            double U=icons[i].getMaxU();
-            double v=icons[i].getMinV();
-            double V=icons[i].getMaxV();
-            switch (i){//{DOWN, UP, NORTH, SOUTH, WEST, EAST}
-                case 0:
-                    tes.addVertexWithUV(X, Y, Z + size, u, V);
-                    tes.addVertexWithUV(X, Y, Z, u, v);
-                    tes.addVertexWithUV(X + size, Y, Z, U, v);
-                    tes.addVertexWithUV(X + size, Y, Z + size, U, V);
-                    break;
-                case 1:
-                    tes.addVertexWithUV(X, Y + size, Z, u, v);
-                    tes.addVertexWithUV(X, Y + size, Z + size, u, V);
-                    tes.addVertexWithUV(X + size, Y + size, Z + size, U, V);
-                    tes.addVertexWithUV(X + size, Y + size, Z, U, v);
-                    break;
-                case 2:
-                    tes.addVertexWithUV(X, Y, Z, U, V);
-                    tes.addVertexWithUV(X, Y + size, Z, U, v);
-                    tes.addVertexWithUV(X + size, Y + size, Z, u, v);
-                    tes.addVertexWithUV(X + size, Y, Z, u, V);
-                    break;
-                case 3:
-                    tes.addVertexWithUV(X + size, Y, Z + size, U, V);
-                    tes.addVertexWithUV(X + size, Y + size, Z + size, U, v);
-                    tes.addVertexWithUV(X, Y + size, Z + size, u, v);
-                    tes.addVertexWithUV(X, Y, Z + size, u, V);
-                    break;
-                case 4:
-                    tes.addVertexWithUV(X, Y, Z + size, U, V);
-                    tes.addVertexWithUV(X, Y + size, Z + size, U, v);
-                    tes.addVertexWithUV(X, Y + size, Z, u, v);
-                    tes.addVertexWithUV(X, Y, Z, u, V);
-                    break;
-                case 5:
-                    tes.addVertexWithUV(X + size, Y, Z, U, V);
-                    tes.addVertexWithUV(X + size, Y + size, Z, U, v);
-                    tes.addVertexWithUV(X + size, Y + size, Z + size, u, v);
-                    tes.addVertexWithUV(X + size, Y, Z + size, u, V);
-                    break;
-            }
-        }
-        GL11.glEnable(GL11.GL_CULL_FACE);
-        GL11.glDepthMask(true);
-    }
-
-    @Override
-    public int getFXLayer() {
-        return 1;
-    }
-
-    @Override
-    public boolean shouldRenderInPass(int pass) {
-        return pass==2;
-    }
-
-    @Override
-    public void setDead() {
-        super.setDead();
-        ClientProxy.onHintDead(this);
-    }
-}

src/main/java/com/gtnewhorizon/structurelib/entity/fx/WeightlessParticleFX.java

@@ -1,41 +1,40 @@
 package com.gtnewhorizon.structurelib.entity.fx;
 
-import cpw.mods.fml.relauncher.Side;
-import cpw.mods.fml.relauncher.SideOnly;
 import net.minecraft.client.particle.EntityFX;
 import net.minecraft.world.World;
 
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+
 @SideOnly(Side.CLIENT)
-public class WeightlessParticleFX extends EntityFX
+public class WeightlessParticleFX extends EntityFX {
-{
+
-    public WeightlessParticleFX(World p_i1205_1_, double p_i1205_2_, double p_i1205_4_, double p_i1205_6_, double p_i1205_8_, double p_i1205_10_, double p_i1205_12_)
+    public WeightlessParticleFX(World p_i1205_1_, double p_i1205_2_, double p_i1205_4_, double p_i1205_6_,
-    {
+            double p_i1205_8_, double p_i1205_10_, double p_i1205_12_) {
         super(p_i1205_1_, p_i1205_2_, p_i1205_4_, p_i1205_6_, p_i1205_8_, p_i1205_10_, p_i1205_12_);
-        this.motionX = p_i1205_8_ + (double)((float)(Math.random() * 2.0D - 1.0D) * 0.05F);
+        this.motionX = p_i1205_8_ + (double) ((float) (Math.random() * 2.0D - 1.0D) * 0.05F);
-        this.motionY = p_i1205_10_ + (double)((float)(Math.random() * 2.0D - 1.0D) * 0.05F);
+        this.motionY = p_i1205_10_ + (double) ((float) (Math.random() * 2.0D - 1.0D) * 0.05F);
-        this.motionZ = p_i1205_12_ + (double)((float)(Math.random() * 2.0D - 1.0D) * 0.05F);
+        this.motionZ = p_i1205_12_ + (double) ((float) (Math.random() * 2.0D - 1.0D) * 0.05F);
         this.particleRed = this.particleGreen = this.particleBlue = this.rand.nextFloat() * 0.3F + 0.7F;
         this.particleScale = this.rand.nextFloat() * this.rand.nextFloat() * 6.0F + 1.0F;
-        this.particleMaxAge = (int)(16.0D / ((double)this.rand.nextFloat() * 0.8D + 0.2D)) + 2;
+        this.particleMaxAge = (int) (16.0D / ((double) this.rand.nextFloat() * 0.8D + 0.2D)) + 2;
-        this.noClip=true;
+        this.noClip = true;
     }
 
     /**
      * Called to update the entity's position/logic.
      */
-    public void onUpdate()
+    public void onUpdate() {
-    {
         this.prevPosX = this.posX;
         this.prevPosY = this.posY;
         this.prevPosZ = this.posZ;
 
-        if (this.particleAge++ >= this.particleMaxAge)
+        if (this.particleAge++ >= this.particleMaxAge) {
-        {
             this.setDead();
         }
 
         this.setParticleTextureIndex(7 - this.particleAge * 8 / this.particleMaxAge);
-        //this.motionY += 0.004D;
+        // this.motionY += 0.004D;
         this.moveEntity(this.motionX, this.motionY, this.motionZ);
         this.motionX *= 0.8999999761581421D;
         this.motionY *= 0.8999999761581421D;

src/main/java/com/gtnewhorizon/structurelib/event/BlockChangeListener.java

@@ -0,0 +1,11 @@
+package com.gtnewhorizon.structurelib.event;
+
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+
+public interface BlockChangeListener {
+
+    void onBlockChange(World world, Chunk chunk, int x, int y, int z, Block oldBlock, Block newBlock, int oldMeta,
+            int newMeta);
+}

src/main/java/com/gtnewhorizon/structurelib/event/BlockChangeNotifier.java

@@ -0,0 +1,33 @@
+package com.gtnewhorizon.structurelib.event;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+
+@SuppressWarnings("ForLoopReplaceableByForEach")
+public class BlockChangeNotifier {
+
+    private static final List<BlockChangeListener> listeners = new ArrayList<>();
+
+    public static synchronized void addListener(BlockChangeListener listener) {
+        listeners.add(listener);
+    }
+
+    public static void onBlockChange(World world, Chunk chunk, int x, int y, int z, Block oldBlock, Block newBlock,
+            int oldMeta, int newMeta) {
+        if (oldBlock == newBlock && oldMeta == newMeta) return;
+
+        if (chunk == null) {
+            chunk = world.getChunkFromBlockCoords(x, z);
+        }
+
+        final int numListeners = listeners.size();
+        for (int i = 0; i < numListeners; i++) {
+            final BlockChangeListener listener = listeners.get(i);
+            listener.onBlockChange(world, chunk, x, y, z, oldBlock, newBlock, oldMeta, newMeta);
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/gui/EmptyContainer.java

@@ -0,0 +1,18 @@
+package com.gtnewhorizon.structurelib.gui;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.inventory.Container;
+
+public class EmptyContainer extends Container {
+
+    private final EntityPlayer player;
+
+    public EmptyContainer(EntityPlayer player) {
+        this.player = player;
+    }
+
+    @Override
+    public boolean canInteractWith(EntityPlayer player) {
+        return player == this.player;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/gui/GuiScreenConfigureChannels.java

@@ -0,0 +1,686 @@
+package com.gtnewhorizon.structurelib.gui;
+
+import java.util.AbstractMap;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiTextField;
+import net.minecraft.client.gui.inventory.GuiContainer;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.inventory.Container;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.StatCollector;
+
+import org.apache.commons.lang3.StringUtils;
+import org.lwjgl.input.Keyboard;
+import org.lwjgl.input.Mouse;
+import org.lwjgl.opengl.GL11;
+
+import com.google.common.base.Splitter;
+import com.gtnewhorizon.structurelib.ChannelDescription;
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.gui.GuiScrollableList.IGuiScreen;
+
+import codechicken.nei.VisiblityData;
+import codechicken.nei.api.INEIGuiHandler;
+import codechicken.nei.api.TaggedInventoryArea;
+import cpw.mods.fml.common.Loader;
+import cpw.mods.fml.common.Optional;
+import gnu.trove.map.TIntObjectMap;
+import gnu.trove.map.hash.TIntObjectHashMap;
+
+@Optional.Interface(iface = "codechicken.nei.api.INEIGuiHandler", modid = "NotEnoughItems")
+public class GuiScreenConfigureChannels extends GuiContainer implements IGuiScreen, INEIGuiHandler {
+
+    private static final String I18N_PREFIX = "item.structurelib.constructableTrigger.gui.";
+
+    private static final int ADD_BTN = 0;
+    private static final int UNSET_BTN = 1;
+    private static final int WIPE_BTN = 2;
+
+    private static final int KEY_MAX_WIDTH = 50;
+    private static final int INFO_BOX_SIZE = 11;
+    private final ItemStack trigger;
+    private final GuiChannelsList list;
+    private final GuiAutoCompleteList autoCompleteList;
+    private final Map<String, List<String>> tooltipSplitCache = new HashMap<>();
+    private final TIntObjectMap<Map<String, String>> trimCache = new TIntObjectHashMap<>();
+    private GuiTextField key, value;
+    protected int guiTop, guiLeft;
+    private List<String> info;
+    private boolean wipePending = false;
+    private long wipePendingTime = 0;
+    private static final long WIPE_CONFIRM_TIMEOUT_MS = 3000;
+
+    public GuiScreenConfigureChannels(Container container, ItemStack trigger) {
+        super(container);
+
+        this.trigger = trigger;
+        list = new GuiChannelsList(152, 91, 12, 21, 14);
+        list.addSelectionListener((list, selectedIndex) -> {
+            Entry<String, Integer> e = list.getElementAt(selectedIndex);
+            key.setText(e.getKey());
+            value.setText(e.getValue().toString());
+            updateButtons();
+        });
+        autoCompleteList = new GuiAutoCompleteList(151 + 12 - 45 - 2, 50, 45, 119 + 12, 14);
+    }
+
+    @Override
+    public void initGui() {
+        super.initGui();
+        // so you can keep holding backspace to delete a long sequence of chars
+        Keyboard.enableRepeatEvents(true);
+
+        guiLeft = (this.width - this.getXSize()) / 2;
+        guiTop = (this.height - this.getYSize()) / 2;
+
+        key = new GuiTextField(fontRendererObj, guiLeft + 45, guiTop + 119, 151 + 12 - 45, 12) {
+
+            @Override
+            public void writeText(String text) {
+                // force lower case
+                super.writeText(text.toLowerCase(Locale.ROOT));
+                updateButtons();
+            }
+
+            @Override
+            public void mouseClicked(int p_146192_1_, int p_146192_2_, int p_146192_3_) {
+                super.mouseClicked(p_146192_1_, p_146192_2_, p_146192_3_);
+                boolean flag = p_146192_1_ >= this.xPosition && p_146192_1_ < this.xPosition + this.width
+                        && p_146192_2_ >= this.yPosition
+                        && p_146192_2_ < this.yPosition + this.height;
+                if (flag && p_146192_3_ == 1) {
+                    key.setText("");
+                    value.setText("");
+                }
+            }
+
+            @Override
+            public void setText(String p_146180_1_) {
+                super.setText(p_146180_1_);
+                updateButtons();
+            }
+        };
+        value = new GuiTextField(fontRendererObj, guiLeft + 45, guiTop + 139, 151 + 12 - 45, 12) {
+
+            @Override
+            public void writeText(String text) {
+                // ignore write requests containing non digit characters.
+                // we don't accept decimals or negative numbers, so we can safely use isDigit instead of something more
+                // advanced
+                // use codePoints() in case someone pasted an emoji by mistake
+                if (text != null && text.codePoints().allMatch(Character::isDigit)) {
+                    super.writeText(text);
+                    updateButtons();
+                }
+            }
+
+            @Override
+            public void setFocused(boolean p_146195_1_) {
+                if (!p_146195_1_ && isFocused() && !StringUtils.isBlank(getText())) {
+                    int result;
+                    try {
+                        result = Math.max(Integer.parseInt(getText()), 1);
+                    } catch (NumberFormatException e) {
+                        result = 1;
+                    }
+                    setText(String.valueOf(result));
+                }
+                super.setFocused(p_146195_1_);
+            }
+
+            @Override
+            public void mouseClicked(int p_146192_1_, int p_146192_2_, int p_146192_3_) {
+                super.mouseClicked(p_146192_1_, p_146192_2_, p_146192_3_);
+                boolean flag = p_146192_1_ >= this.xPosition && p_146192_1_ < this.xPosition + this.width
+                        && p_146192_2_ >= this.yPosition
+                        && p_146192_2_ < this.yPosition + this.height;
+                if (flag && p_146192_3_ == 1) {
+                    setText("");
+                }
+            }
+
+            @Override
+            public void setText(String p_146180_1_) {
+                super.setText(p_146180_1_);
+                updateButtons();
+            }
+        };
+
+        list.onGuiInit(this);
+        autoCompleteList.onGuiInit(this);
+
+        addButton(new GuiButton(ADD_BTN, guiLeft + 12, guiTop + 157, 47, 20, I18n.format(I18N_PREFIX + "add")));
+        addButton(new GuiButton(UNSET_BTN, guiLeft + 65, guiTop + 157, 47, 20, I18n.format(I18N_PREFIX + "unset")));
+        addButton(new GuiButton(WIPE_BTN, guiLeft + 118, guiTop + 157, 47, 20, I18n.format(I18N_PREFIX + "wipe")));
+
+        updateButtons();
+        tooltipSplitCache.clear();
+        info = StreamSupport
+                .stream(
+                        Splitter.on("\\n").split(StatCollector.translateToLocal(I18N_PREFIX + "info")).spliterator(),
+                        false)
+                .flatMap(line -> fontRendererObj.listFormattedStringToWidth(line, width * 1 / 3).stream())
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public int getGuiLeft() {
+        return guiLeft;
+    }
+
+    @Override
+    public int getGuiTop() {
+        return guiTop;
+    }
+
+    @Override
+    public int getXSize() {
+        return 176;
+    }
+
+    @Override
+    public int getYSize() {
+        return 188;
+    }
+
+    @Override
+    public void addButton(GuiButton button) {
+        getButtonList().add(button);
+    }
+
+    @Override
+    public void removeButton(GuiButton button) {
+        getButtonList().remove(button);
+    }
+
+    @Override
+    public int getOverlayOffsetX() {
+        return 0;
+    }
+
+    @Override
+    public void doActionPerformed(GuiButton but) {
+        actionPerformed(but);
+    }
+
+    public List<GuiButton> getButtonList() {
+        return buttonList;
+    }
+
+    private boolean isMouseOverValue() {
+        int mx = Mouse.getEventX() * this.width / this.mc.displayWidth;
+        int my = this.height - Mouse.getEventY() * this.height / this.mc.displayHeight - 1;
+        return mx >= value.xPosition && mx < value.xPosition + value.width
+                && my >= value.yPosition
+                && my < value.yPosition + value.height;
+
+    }
+
+    @Override
+    public void handleMouseInput() {
+        int delta = Mouse.getEventDWheel();
+        if (delta != 0) {
+            if (isMouseOverValue()) {
+                if (delta > 0) {
+                    value.setText(String.valueOf(getValue() + 1));
+                } else {
+                    value.setText(String.valueOf(Math.max(getValue() - 1, 1)));
+                }
+            } else {
+                list.handleDWheel(delta);
+            }
+        }
+        super.handleMouseInput();
+    }
+
+    @Override
+    protected void mouseClicked(int mX, int mY, int button) {
+        super.mouseClicked(mX, mY, button);
+        key.mouseClicked(mX, mY, button);
+        value.mouseClicked(mX, mY, button);
+    }
+
+    @Override
+    protected void keyTyped(char aChar, int aKey) {
+        GuiScrollableList<?> l = key.isFocused() ? autoCompleteList : list;
+        switch (aKey) {
+            case Keyboard.KEY_TAB:
+                if (key.isFocused()) {
+                    if (autoCompleteList.getSelectedElement() != null) {
+                        key.setText(autoCompleteList.getSelectedElement());
+                        return;
+                    }
+
+                    key.setFocused(false);
+                    value.setFocused(true);
+                } else {
+                    key.setFocused(true);
+                    value.setFocused(false);
+                }
+                return;
+            case Keyboard.KEY_RETURN:
+            case Keyboard.KEY_NUMPADENTER:
+                if (key.isFocused() && autoCompleteList.getSelectedElement() != null) {
+                    key.setText(autoCompleteList.getSelectedElement());
+                    key.setFocused(false);
+                    value.setFocused(true);
+                    value.setText("1");
+                    value.setSelectionPos(0);
+                    return;
+                }
+                GuiButton add = getButtonList().get(ADD_BTN);
+                if (add.enabled) doActionPerformed(add);
+                return;
+            case Keyboard.KEY_UP:
+                if (l.selectedIndex > 0) l.setSelection(l.selectedIndex - 1);
+                return;
+            case Keyboard.KEY_DOWN:
+                if (l.selectedIndex < l.getNumElements() - 1) l.setSelection(l.selectedIndex + 1);
+                return;
+            case Keyboard.KEY_ESCAPE:
+                if (key.isFocused()) {
+                    if (autoCompleteList.getSelectedElement() != null) {
+                        autoCompleteList.reset();
+                    } else {
+                        key.setFocused(false);
+                    }
+                    return;
+                }
+                break;
+        }
+        if (key.textboxKeyTyped(aChar, aKey) || value.textboxKeyTyped(aChar, aKey)) {
+            updateButtons();
+            return;
+        }
+        super.keyTyped(aChar, aKey);
+    }
+
+    private void updateButtons() {
+        // this will be called from setText of key and value. NEVER UPDATE THE VALUE OF THESE HERE OR GET A
+        // STACKOVERFLOW!
+        String keyText = key.getText();
+        boolean existing = !StringUtils.isEmpty(keyText) && ChannelDataAccessor.hasSubChannel(trigger, keyText);
+        getButtonList().get(ADD_BTN).displayString = existing ? I18n.format(I18N_PREFIX + "set")
+                : I18n.format(I18N_PREFIX + "add");
+        getButtonList().get(ADD_BTN).enabled = !StringUtils.isBlank(key.getText())
+                && !StringUtils.isBlank(value.getText())
+                && Integer.parseInt(value.getText()) > 0;
+        getButtonList().get(UNSET_BTN).enabled = existing && !StringUtils.isBlank(value.getText());
+
+        autoCompleteList.reset();
+    }
+
+    private int getValue() {
+        try {
+            return Integer.parseInt(value.getText());
+        } catch (NumberFormatException e) {
+            return -1;
+        }
+    }
+
+    @Override
+    protected void actionPerformed(GuiButton btn) {
+        if (btn == null) return;
+        switch (btn.id) {
+            case ADD_BTN:
+                int value = getValue();
+                if (value <= 0) return;
+                ChannelDataAccessor.setChannelData(trigger, key.getText(), value);
+                break;
+            case UNSET_BTN:
+                ChannelDataAccessor.unsetChannelData(trigger, key.getText());
+                break;
+            case WIPE_BTN:
+                if (!wipePending) {
+                    wipePending = true;
+                    wipePendingTime = System.currentTimeMillis();
+                    btn.displayString = I18n.format(I18N_PREFIX + "wipe.confirm");
+                } else {
+                    wipePending = false;
+                    btn.displayString = I18n.format(I18N_PREFIX + "wipe");
+                    ChannelDataAccessor.wipeChannelData(trigger);
+                    key.setText("");
+                    this.value.setText("");
+                }
+                break;
+        }
+
+        updateButtons();
+
+        super.actionPerformed(btn);
+    }
+
+    @Override
+    public void onGuiClosed() {
+        super.onGuiClosed();
+        Keyboard.enableRepeatEvents(false);
+        StructureLib.instance().proxy().uploadChannels(trigger);
+    }
+
+    @Override
+    public void updateScreen() {
+        super.updateScreen();
+        key.updateCursorCounter();
+        value.updateCursorCounter();
+        if (wipePending && System.currentTimeMillis() - wipePendingTime > WIPE_CONFIRM_TIMEOUT_MS) {
+            wipePending = false;
+            getButtonList().get(WIPE_BTN).displayString = I18n.format(I18N_PREFIX + "wipe");
+        }
+    }
+
+    @Override
+    public void drawGuiContainerBackgroundLayer(float partialTick, int mX, int mY) {
+        mc.renderEngine.bindTexture(new ResourceLocation("structurelib", "textures/gui/channels.png"));
+        int topLeftX = (this.width - this.getXSize()) / 2;
+        int topLeftY = (this.height - this.getYSize()) / 2;
+        drawTexturedModalRect(topLeftX, topLeftY, 0, 0, getXSize(), getYSize());
+        list.drawScreen(mX, mY, partialTick);
+        fontRendererObj.drawString(I18n.format(I18N_PREFIX + "title"), guiLeft + 12, guiTop + 9, 0);
+        fontRendererObj.drawString(I18n.format(I18N_PREFIX + "key"), guiLeft + 12, guiTop + 122, 0);
+        key.drawTextBox();
+        fontRendererObj.drawString(I18n.format(I18N_PREFIX + "value"), guiLeft + 12, guiTop + 142, 0);
+        value.drawTextBox();
+    }
+
+    @Override
+    protected void drawGuiContainerForegroundLayer(int mouseX, int mouseY) {
+        if (key.isFocused() && autoCompleteList.getNumElements() > 0) {
+            autoCompleteList.drawScreen(mouseX, mouseY, 0);
+        }
+    }
+
+    @Override
+    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+        super.drawScreen(mouseX, mouseY, partialTicks);
+        String highlight = null;
+        if (key.isFocused() && autoCompleteList.getNumElements() > 0) {
+            highlight = autoCompleteList.getSelectedElement();
+        }
+        if (highlight == null && ChannelDescription.has(key.getText())) {
+            highlight = key.getText();
+        }
+        if (highlight != null) {
+            drawChannelDescriptionTooltip(highlight);
+        }
+        if (mouseX > xSize + guiLeft - INFO_BOX_SIZE - 12 && mouseX < xSize + guiLeft - 12
+                && mouseY > guiTop + 7
+                && mouseY < guiTop + INFO_BOX_SIZE + 7) {
+            drawHoveringText(info, mouseX, mouseY, fontRendererObj);
+        }
+    }
+
+    private void drawChannelDescriptionTooltip(String candidate) {
+        List<String> tooltip = tooltipSplitCache.computeIfAbsent(candidate, this::getChannelDescriptionTooltip);
+        drawHoveringText(tooltip, guiLeft + 151 + 12, guiTop + 122, fontRendererObj);
+    }
+
+    private List<String> getChannelDescriptionTooltip(String candidate) {
+        List<String> tooltip = new ArrayList<>();
+        int maxLine = width - (guiLeft + 151 + 12) - 12;
+        for (Entry<String, String> e : ChannelDescription.get(candidate).getDescriptions().entrySet()) {
+            tooltip.addAll(
+                    fontRendererObj.listFormattedStringToWidth(
+                            StatCollector.translateToLocalFormatted(
+                                    I18N_PREFIX + "channels.from",
+                                    Loader.instance().getIndexedModList().get(e.getKey()).getName()),
+                            maxLine));
+            tooltip.addAll(
+                    fontRendererObj.listFormattedStringToWidth(StatCollector.translateToLocal(e.getValue()), maxLine));
+        }
+        return tooltip;
+    }
+
+    public String trim(String str, int keyMaxWidth) {
+        Map<String, String> cache = trimCache.get(keyMaxWidth);
+        if (cache == null) {
+            trimCache.put(keyMaxWidth, cache = new HashMap<>());
+        }
+        return cache.computeIfAbsent(str, e -> {
+            String s = fontRendererObj.trimStringToWidth(e, keyMaxWidth);
+            if (s.length() != e.length()) {
+                StringBuilder buffer = new StringBuilder(s).deleteCharAt(s.length() - 1).append("...");
+                while ((s = fontRendererObj.trimStringToWidth(buffer.toString(), keyMaxWidth)).length()
+                        != buffer.length())
+                    // drop last original char
+                    buffer.deleteCharAt(s.length() - 4);
+                do {
+                    buffer.append('.');
+                } while (fontRendererObj.getStringWidth(buffer.toString()) <= keyMaxWidth);
+                s = buffer.deleteCharAt(s.length() - 1).insert(s.length() - 3, EnumChatFormatting.GRAY).toString();
+            }
+            return s;
+        });
+    }
+
+    @Override
+    @Optional.Method(modid = "NotEnoughItems")
+    public VisiblityData modifyVisiblity(GuiContainer gui, VisiblityData currentVisibility) {
+        return null;
+    }
+
+    @Override
+    public Iterable<Integer> getItemSpawnSlots(GuiContainer gui, ItemStack item) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<TaggedInventoryArea> getInventoryAreas(GuiContainer gui) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean handleDragNDrop(GuiContainer gui, int mousex, int mousey, ItemStack draggedStack, int button) {
+        if (button != 0 || mousex <= guiLeft
+                || mousey <= guiTop
+                || mousex >= guiLeft + getXSize()
+                || mousey >= guiTop + getYSize()) {
+            return false;
+        }
+        Collection<Entry<String, Integer>> channels = ChannelDescription.iterate(draggedStack);
+        switch (channels.size()) {
+            case 0:
+                return false;
+            case 1:
+            default: // TODO implement a GUI to select which pair to use, instead of blindly using the first
+                Entry<String, Integer> e = channels.iterator().next();
+                ChannelDataAccessor.setChannelData(trigger, e.getKey(), e.getValue());
+                key.setText(e.getKey());
+                value.setText(e.getValue().toString());
+                draggedStack.stackSize = 0;
+                return true;
+        }
+    }
+
+    @Override
+    public boolean hideItemPanelSlot(GuiContainer gui, int x, int y, int w, int h) {
+        return false;
+    }
+
+    private class GuiAutoCompleteList extends GuiScrollableList<String> {
+
+        private List<Entry<String, String>> cache; // <key, display string>
+
+        public GuiAutoCompleteList(int width, int height, int originX, int originY, int slotHeight) {
+            super(width, height, originX, originY, slotHeight);
+            margin = 2;
+        }
+
+        private List<Entry<String, String>> getOptions() {
+            if (cache == null) {
+                cache = search();
+            }
+            return cache;
+        }
+
+        private List<Entry<String, String>> search() {
+            List<Entry<String, String>> cache = new ArrayList<>();
+            Set<String> added = new HashSet<>();
+            String term = key.getText();
+            String[] subjects = ChannelDescription.getAll().keySet().toArray(new String[0]);
+            Arrays.sort(subjects);
+            if (StringUtils.isBlank(term)) {
+                // nothing. just gives out everything
+                for (String subject : subjects) {
+                    cache.add(new AbstractMap.SimpleImmutableEntry<>(subject, EnumChatFormatting.GRAY + subject));
+                }
+                return cache;
+            }
+            // prefix match
+            for (String s : subjects) {
+                if (s.startsWith(term)) {
+                    cache.add(
+                            new AbstractMap.SimpleImmutableEntry<>(
+                                    s,
+                                    term + EnumChatFormatting.GRAY + s.substring(term.length())));
+                    added.add(s);
+                }
+            }
+            // subsequence match
+            for (String subject : subjects) {
+                if (!added.contains(subject) && subject.length() > term.length()) {
+                    int i = 0, j = 0;
+                    StringBuilder sb = new StringBuilder();
+                    boolean mode = true;
+                    sb.append(EnumChatFormatting.WHITE);
+                    while (i < term.length() && j < subject.length()) {
+                        if (term.codePointAt(i) == subject.codePointAt(j)) {
+                            if (!mode) {
+                                sb.append(EnumChatFormatting.WHITE);
+                                mode = true;
+                            }
+                            sb.appendCodePoint(term.codePointAt(i));
+                            i++;
+                            j++;
+                        } else {
+                            if (mode) {
+                                sb.append(EnumChatFormatting.GRAY);
+                                mode = false;
+                            }
+                            sb.appendCodePoint(subject.codePointAt(j));
+                            j++;
+                        }
+                    }
+                    if (i == term.length()) {
+                        if (j < subject.length()) {
+                            sb.append(EnumChatFormatting.GRAY);
+                            sb.append(subject, j, subject.length());
+                        }
+                        cache.add(new AbstractMap.SimpleImmutableEntry<>(subject, sb.toString()));
+                        added.add(subject);
+                    }
+                }
+            }
+            return cache;
+        }
+
+        public void reset() {
+            cache = search();
+            selectedIndex = cache.isEmpty() ? -1 : 0;
+            resetScroll();
+        }
+
+        @Override
+        public String getElementAt(int index) {
+            return index >= 0 && index < cache.size() ? getOptions().get(index).getKey() : null;
+        }
+
+        @Override
+        public int getNumElements() {
+            return getOptions().size();
+        }
+
+        @Override
+        protected void drawElement(int elementIndex, int x, int y, int height, Tessellator tessellator,
+                boolean isHovering) {
+            int color = elementIndex == selectedIndex ? 0xffffff : 0xcccccc;
+            fontRendererObj.drawString(getOptions().get(elementIndex).getValue(), x + margin, y + margin / 2, color);
+        }
+    }
+
+    private class GuiChannelsList extends GuiScrollableList<Entry<String, Integer>> {
+
+        private List<Entry<String, Integer>> cache;
+
+        public GuiChannelsList(int width, int height, int originX, int originY, int slotHeight) {
+            super(width, height, originX, originY, slotHeight);
+        }
+
+        @Override
+        public Entry<String, Integer> getElementAt(int index) {
+            return ChannelDataAccessor.iterateChannelData(trigger).sorted().skip(index).findFirst().orElse(null);
+        }
+
+        @Override
+        public int getNumElements() {
+            return ChannelDataAccessor.countChannelData(trigger);
+        }
+
+        @Override
+        protected boolean elementClicked(int elementIndex, boolean doubleClick, int mXRelative, int mYRelative) {
+            if (mXRelative >= margin + 1 && mXRelative <= margin + 5
+                    && mYRelative >= margin / 2 + 1
+                    && mYRelative <= margin / 2 + 5) {
+                Entry<String, Integer> e = getElementAt(elementIndex);
+                if (e != null) {
+                    ChannelDataAccessor.unsetChannelData(trigger, e.getKey());
+                    updateButtons();
+                    return false;
+                }
+            }
+            return super.elementClicked(elementIndex, doubleClick, mXRelative, mYRelative);
+        }
+
+        @Override
+        protected void prepareDrawElements() {
+            cache = ChannelDataAccessor.iterateChannelData(trigger).sorted().collect(Collectors.toList());
+        }
+
+        @Override
+        protected void drawElement(int elementIndex, int x, int y, int height, Tessellator tessellator,
+                boolean isHovering) {
+            if (elementIndex < 0 || elementIndex >= cache.size()) {
+                return;
+            }
+            Entry<String, Integer> e = cache.get(elementIndex);
+            if (e == null) return;
+            if (elementIndex > 0) {
+                // args x1, x2, y1, color
+                drawHorizontalLine(minX + 1, maxX - 1, y - 2, 0xffaaaaaa);
+            }
+            int keyMaxWidth = KEY_MAX_WIDTH * 2;
+            if (isHovering) {
+                mc.renderEngine.bindTexture(new ResourceLocation("structurelib", "textures/gui/channels.png"));
+                GL11.glColor4f(1, 1, 1, 1);
+                drawTexturedModalRect(x + margin + 1, y + margin / 2 + 1, 251, 251, 5, 5);
+            }
+            fontRendererObj.drawString(trim(e.getKey(), keyMaxWidth - 9), x + margin + 8, y + margin / 2, 0xffffff);
+            int valueX = x + margin + keyMaxWidth + margin;
+            fontRendererObj.drawString(trim(e.getValue().toString(), maxX - valueX), valueX, y + margin / 2, 0xffffff);
+        }
+
+        @Override
+        public void drawScreen(int mX, int mY, float partialTick) {
+            super.drawScreen(mX, mY, partialTick);
+            // args x1, y1, y2, color
+            drawVerticalLine(minX + margin + margin / 2 + KEY_MAX_WIDTH * 2, minY + 1, maxY - 1, 0xffaaaaaa);
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/gui/GuiScrollableList.java

@@ -0,0 +1,468 @@
+package com.gtnewhorizon.structurelib.gui;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.ScaledResolution;
+import net.minecraft.client.renderer.Tessellator;
+
+import org.lwjgl.input.Mouse;
+import org.lwjgl.opengl.GL11;
+
+/**
+ * Shamelessly stolen from EnderCore, with some amount of edit to fit in one file. Original code from CrazyPants.
+ * <p>
+ * As the code has been released into public domain, it is now LGPL as part of this library as a whole. You can go to
+ * EnderCore's repository to obtain a public domain copy though
+ * <p>
+ * Major edits
+ * <ul>
+ * <li>Separate dwheel handling to handleDWheel. The next event calls often cause the mouse click event to not fire on
+ * other widgets</li>
+ * <li>scrollbar are now rendered within width</li>
+ * <li>added prepareDrawElements</li>
+ * </ul>
+ *
+ * @author CrazyPants
+ * @author glee8e
+ */
+public abstract class GuiScrollableList<T> {
+
+    protected final int slotHeight;
+    private final Minecraft mc = Minecraft.getMinecraft();
+    protected final int originX;
+    protected final int originY;
+    protected final int width;
+    protected final int height;
+    protected int minY;
+    protected int maxY;
+    protected int minX;
+    protected int maxX;
+    protected int mouseX;
+    protected int mouseY;
+    protected int selectedIndex = -1;
+    protected int margin = 4;
+    protected final List<ListSelectionListener<T>> listeners = new CopyOnWriteArrayList<>();
+    private int scrollUpButtonID;
+    private int scrollDownButtonID;
+    private float initialClickY = -2.0F;
+    private float scrollMultiplier;
+    private float amountScrolled;
+    private long lastClickedTime;
+
+    private boolean showSelectionBox = true;
+
+    public GuiScrollableList(int width, int height, int originX, int originY, int slotHeight) {
+        this.width = width;
+        this.height = height;
+        this.originX = originX;
+        this.originY = originY;
+        this.slotHeight = slotHeight;
+
+        minY = originY;
+        maxY = minY + height;
+        minX = originX;
+        maxX = minX + width;
+    }
+
+    public void onGuiInit(IGuiScreen gui) {
+        minY = originY + gui.getGuiTop();
+        maxY = minY + height;
+        minX = originX + gui.getGuiLeft();
+        maxX = minX + width;
+    }
+
+    public void addSelectionListener(ListSelectionListener<T> listener) {
+        listeners.add(listener);
+    }
+
+    public void removeSelectionListener(ListSelectionListener<T> listener) {
+        listeners.remove(listener);
+    }
+
+    public T getSelectedElement() {
+        return getElementAt(selectedIndex);
+    }
+
+    public void setSelection(T selection) {
+        setSelection(getIndexOf(selection));
+    }
+
+    public void setSelection(int index) {
+        if (index == selectedIndex) {
+            return;
+        }
+        selectedIndex = index;
+        for (ListSelectionListener<T> listener : listeners) {
+            listener.selectionChanged(this, selectedIndex);
+        }
+    }
+
+    public int getIndexOf(T element) {
+        if (element == null) {
+            return -1;
+        }
+        for (int i = 0; i < getNumElements(); i++) {
+            if (element.equals(getElementAt(i))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    public abstract T getElementAt(int index);
+
+    public abstract int getNumElements();
+
+    protected abstract void drawElement(int elementIndex, int x, int y, int height, Tessellator tessellator,
+            boolean isHovering);
+
+    protected boolean elementClicked(int elementIndex, boolean doubleClick, int mXRelative, int mYRelative) {
+        return true;
+    }
+
+    public void setShowSelectionBox(boolean val) {
+        showSelectionBox = val;
+    }
+
+    protected int getContentHeight() {
+        return getNumElements() * slotHeight;
+    }
+
+    public void setScrollButtonIds(int scrollUpButtonID, int scrollDownButtonID) {
+        this.scrollUpButtonID = scrollUpButtonID;
+        this.scrollDownButtonID = scrollDownButtonID;
+    }
+
+    private void clampScrollToBounds() {
+        int i = getContentOverhang();
+        if (i < 0) {
+            i *= -1;
+        }
+        if (amountScrolled < 0.0F) {
+            amountScrolled = 0.0F;
+        }
+        if (amountScrolled > i) {
+            amountScrolled = i;
+        }
+    }
+
+    public int getContentOverhang() {
+        return getContentHeight() - (height - margin);
+    }
+
+    public void actionPerformed(GuiButton b) {
+        if (b.enabled) {
+            if (b.id == scrollUpButtonID) {
+                amountScrolled -= slotHeight * 2f / 3;
+                initialClickY = -2.0F;
+                clampScrollToBounds();
+            } else if (b.id == scrollDownButtonID) {
+                amountScrolled += slotHeight * 2f / 3;
+                initialClickY = -2.0F;
+                clampScrollToBounds();
+            }
+        }
+    }
+
+    protected void resetScroll() {
+        amountScrolled = 0;
+    }
+
+    /**
+     * draws the slot to the screen, pass in mouse's current x and y and partial ticks
+     */
+    public void drawScreen(int mX, int mY, float partialTick) {
+        GL11.glPushMatrix();
+        GL11.glLoadIdentity();
+        GL11.glTranslatef(0.0F, 0.0F, -2000.0F);
+        this.mouseX = mX;
+        this.mouseY = mY;
+
+        processMouseEvents();
+
+        if (getContentOverhang() > 0) maxX = minX + width - 6;
+        else maxX = minX + width;
+
+        clampScrollToBounds();
+
+        GL11.glDisable(GL11.GL_LIGHTING);
+        GL11.glDisable(GL11.GL_FOG);
+
+        ScaledResolution sr = new ScaledResolution(mc, mc.displayWidth, mc.displayHeight);
+        int sx = minX * sr.getScaleFactor();
+        int sw = width * sr.getScaleFactor();
+        int sy = mc.displayHeight - (maxY * sr.getScaleFactor());
+        int sh = height * sr.getScaleFactor();
+        GL11.glEnable(GL11.GL_SCISSOR_TEST);
+        GL11.glScissor(sx, sy, sw, sh);
+
+        Tessellator tessellator = Tessellator.instance;
+        drawContainerBackground(tessellator);
+
+        int amountScrolled = (int) this.amountScrolled;
+        int contentYOffset = this.minY + margin - amountScrolled;
+
+        boolean hoveringPrecondition = mX >= minX && mX <= maxX && mY >= minY && mY <= maxY;
+        int slotHeight = this.slotHeight - margin;
+
+        if (selectedIndex != -1) {
+            int elementY = contentYOffset + selectedIndex * this.slotHeight;
+            if (elementY + slotHeight > maxY) {
+                this.amountScrolled = (selectedIndex + 1) * this.slotHeight - this.height + margin;
+                amountScrolled = (int) this.amountScrolled;
+                contentYOffset = this.minY + margin - amountScrolled;
+            } else if (elementY < minY) {
+                this.amountScrolled = selectedIndex * this.slotHeight;
+                amountScrolled = (int) this.amountScrolled;
+                contentYOffset = this.minY + margin - amountScrolled;
+            }
+        }
+
+        prepareDrawElements();
+
+        for (int i = 0; i < getNumElements(); ++i) {
+
+            int elementY = contentYOffset + i * this.slotHeight;
+
+            if (elementY <= maxY && elementY + slotHeight >= minY) {
+
+                if (showSelectionBox && i == selectedIndex) {
+                    GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
+                    GL11.glDisable(GL11.GL_TEXTURE_2D);
+                    tessellator.startDrawingQuads();
+                    tessellator.setColorOpaque_I(8421504);
+                    tessellator.addVertexWithUV(minX, elementY + slotHeight + 2, 0.0D, 0.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX, elementY + slotHeight + 2, 0.0D, 1.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX, elementY - 2, 0.0D, 1.0D, 0.0D);
+                    tessellator.addVertexWithUV(minX, elementY - 2, 0.0D, 0.0D, 0.0D);
+                    tessellator.setColorOpaque_I(0);
+                    tessellator.addVertexWithUV(minX + 1, elementY + slotHeight + 1, 0.0D, 0.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX - 1, elementY + slotHeight + 1, 0.0D, 1.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX - 1, elementY - 1, 0.0D, 1.0D, 0.0D);
+                    tessellator.addVertexWithUV(minX + 1, elementY - 1, 0.0D, 0.0D, 0.0D);
+                    tessellator.draw();
+                    GL11.glEnable(GL11.GL_TEXTURE_2D);
+                }
+
+                boolean isHovering = hoveringPrecondition && elementY - 2 <= mY && mY < elementY + slotHeight + 2;
+                drawElement(i, minX, elementY, slotHeight, tessellator, isHovering);
+            }
+        }
+
+        GL11.glDisable(GL11.GL_SCISSOR_TEST);
+
+        GL11.glDisable(GL11.GL_DEPTH_TEST);
+        GL11.glEnable(GL11.GL_BLEND);
+        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
+        GL11.glDisable(GL11.GL_ALPHA_TEST);
+        GL11.glShadeModel(GL11.GL_SMOOTH);
+        GL11.glDisable(GL11.GL_TEXTURE_2D);
+
+        tessellator.startDrawingQuads();
+        tessellator.setColorRGBA_I(0, 0);
+        tessellator.addVertexWithUV(this.minX, this.minY + margin, 0.0D, 0.0D, 1.0D);
+        tessellator.addVertexWithUV(this.maxX, this.minY + margin, 0.0D, 1.0D, 1.0D);
+        tessellator.setColorRGBA_I(0, 255);
+        tessellator.addVertexWithUV(this.maxX, this.minY, 0.0D, 1.0D, 0.0D);
+        tessellator.addVertexWithUV(this.minX, this.minY, 0.0D, 0.0D, 0.0D);
+        tessellator.draw();
+        tessellator.startDrawingQuads();
+        tessellator.setColorRGBA_I(0, 255);
+        tessellator.addVertexWithUV(this.minX, this.maxY, 0.0D, 0.0D, 1.0D);
+        tessellator.addVertexWithUV(this.maxX, this.maxY, 0.0D, 1.0D, 1.0D);
+        tessellator.setColorRGBA_I(0, 0);
+        tessellator.addVertexWithUV(this.maxX, this.maxY - margin, 0.0D, 1.0D, 0.0D);
+        tessellator.addVertexWithUV(this.minX, this.maxY - margin, 0.0D, 0.0D, 0.0D);
+        tessellator.draw();
+
+        renderScrollBar(tessellator);
+
+        GL11.glEnable(GL11.GL_TEXTURE_2D);
+        GL11.glShadeModel(GL11.GL_FLAT);
+        GL11.glEnable(GL11.GL_ALPHA_TEST);
+        GL11.glDisable(GL11.GL_BLEND);
+        GL11.glPopMatrix();
+    }
+
+    protected void prepareDrawElements() {}
+
+    protected void renderScrollBar(Tessellator tessellator) {
+
+        int contentHeightOverBounds = getContentOverhang();
+        if (contentHeightOverBounds > 0) {
+
+            int clear = (maxY - minY) * (maxY - minY) / getContentHeight();
+
+            if (clear < 32) {
+                clear = 32;
+            }
+
+            if (clear > maxY - minY - 8) {
+                clear = maxY - minY - 8;
+            }
+
+            int y = (int) this.amountScrolled * (maxY - minY - clear) / contentHeightOverBounds + minY;
+            if (y < minY) {
+                y = minY;
+            }
+
+            GL11.glDisable(GL11.GL_TEXTURE_2D);
+            int scrollBarMinX = getScrollBarX();
+            int scrollBarMaxX = scrollBarMinX + 6;
+            tessellator.startDrawingQuads();
+
+            tessellator.setColorRGBA_I(0, 255);
+            tessellator.addVertexWithUV(scrollBarMinX, maxY, 0.0D, 0.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, maxY, 0.0D, 1.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, minY, 0.0D, 1.0D, 0.0D);
+            tessellator.addVertexWithUV(scrollBarMinX, minY, 0.0D, 0.0D, 0.0D);
+
+            tessellator.setColorRGBA_F(0.3f, 0.3f, 0.3f, 1);
+            tessellator.addVertexWithUV(scrollBarMinX, (y + clear), 0.0D, 0.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, (y + clear), 0.0D, 1.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, y, 0.0D, 1.0D, 0.0D);
+            tessellator.addVertexWithUV(scrollBarMinX, y, 0.0D, 0.0D, 0.0D);
+
+            tessellator.setColorRGBA_F(0.7f, 0.7f, 0.7f, 1);
+            tessellator.addVertexWithUV(scrollBarMinX, (y + clear - 1), 0.0D, 0.0D, 1.0D);
+            tessellator.addVertexWithUV((scrollBarMaxX - 1), (y + clear - 1), 0.0D, 1.0D, 1.0D);
+            tessellator.addVertexWithUV((scrollBarMaxX - 1), y, 0.0D, 1.0D, 0.0D);
+            tessellator.addVertexWithUV(scrollBarMinX, y, 0.0D, 0.0D, 0.0D);
+
+            tessellator.draw();
+            GL11.glEnable(GL11.GL_TEXTURE_2D);
+        }
+    }
+
+    private void processMouseEvents() {
+        if (Mouse.isButtonDown(0)) {
+            processMouseBown();
+        } else {
+            initialClickY = -1.0F;
+        }
+    }
+
+    public void handleDWheel(int mouseWheelDelta) {
+        if (!Mouse.isButtonDown(0)) {
+            if (mouseWheelDelta > 0) {
+                amountScrolled -= slotHeight / 2f;
+            } else /* if (mouseWheelDelta < 0) */ {
+                amountScrolled += slotHeight / 2f;
+            }
+        }
+    }
+
+    private void processMouseBown() {
+        int contentHeightOverBounds;
+        if (initialClickY == -1.0F) {
+
+            if (mouseY >= minY && mouseY <= maxY && mouseX >= minX && mouseX <= maxX + 6) {
+
+                boolean clickInBounds = true;
+
+                int y = mouseY - minY + (int) amountScrolled - margin;
+                int mouseOverElement = y / slotHeight;
+
+                if (mouseX >= minX && mouseX <= maxX
+                        && mouseOverElement >= 0
+                        && y >= 0
+                        && mouseOverElement < getNumElements()) {
+                    boolean doubleClick = mouseOverElement == selectedIndex
+                            && Minecraft.getSystemTime() - lastClickedTime < 250L;
+                    if (elementClicked(
+                            mouseOverElement,
+                            doubleClick,
+                            mouseX - minX,
+                            y - slotHeight * mouseOverElement)) {
+                        setSelection(mouseOverElement);
+                        lastClickedTime = Minecraft.getSystemTime();
+                    }
+                } else if (mouseX >= minX && mouseX <= maxX && y < 0) {
+                    clickInBounds = false;
+                }
+
+                int scrollBarMinX = getScrollBarX();
+                int scrollBarMaxX = scrollBarMinX + 6;
+                if (mouseX >= scrollBarMinX && mouseX <= scrollBarMaxX) {
+
+                    scrollMultiplier = -1.0F;
+                    contentHeightOverBounds = getContentOverhang();
+
+                    if (contentHeightOverBounds < 1) {
+                        contentHeightOverBounds = 1;
+                    }
+
+                    int empty = (int) ((float) ((maxY - minY) * (maxY - minY)) / (float) getContentHeight());
+                    if (empty < 32) {
+                        empty = 32;
+                    }
+                    if (empty > maxY - minY - 8) {
+                        empty = maxY - minY - 8;
+                    }
+                    scrollMultiplier /= (float) (maxY - minY - empty) / (float) contentHeightOverBounds;
+
+                } else {
+                    scrollMultiplier = 1.0F;
+                }
+
+                if (clickInBounds) {
+                    initialClickY = mouseY;
+                } else {
+                    initialClickY = -2.0F;
+                }
+
+            } else {
+                initialClickY = -2.0F;
+            }
+
+        } else if (initialClickY >= 0.0F) {
+            // Scrolling
+            amountScrolled -= (mouseY - initialClickY) * scrollMultiplier;
+            initialClickY = mouseY;
+        }
+    }
+
+    protected int getScrollBarX() {
+        return maxX;
+    }
+
+    protected void drawContainerBackground(Tessellator tess) {
+        GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
+        GL11.glDisable(GL11.GL_TEXTURE_2D);
+        tess.startDrawingQuads();
+        tess.setColorOpaque_I(0x202020);
+        tess.addVertex(minX, maxY, 0.0D);
+        tess.addVertex(maxX, maxY, 0.0D);
+        tess.addVertex(maxX, minY, 0.0D);
+        tess.addVertex(minX, minY, 0.0D);
+        tess.draw();
+        GL11.glEnable(GL11.GL_TEXTURE_2D);
+    }
+
+    public interface IGuiScreen {
+
+        int getGuiLeft();
+
+        int getGuiTop();
+
+        int getXSize();
+
+        int getYSize();
+
+        void addButton(GuiButton button);
+
+        void removeButton(GuiButton button);
+
+        int getOverlayOffsetX();
+
+        void doActionPerformed(GuiButton but);
+    }
+
+    public interface ListSelectionListener<T> {
+
+        void selectionChanged(GuiScrollableList<T> list, int selectedIndex);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/item/ItemBlockHint.java

@@ -1,5 +1,9 @@
 package com.gtnewhorizon.structurelib.item;
 
+import static net.minecraft.util.StatCollector.translateToLocal;
+
+import java.util.List;
+
 import net.minecraft.block.Block;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
@@ -7,60 +11,69 @@ import net.minecraft.item.ItemBlock;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumChatFormatting;
 
-import java.util.List;
-
-import static net.minecraft.util.StatCollector.translateToLocal;
-
 public class ItemBlockHint extends ItemBlock {
-	public ItemBlockHint(Block p_i45328_1_) {
-		super(p_i45328_1_);
-		setMaxDamage(0);
-		setHasSubtypes(true);
-		setCreativeTab(CreativeTabs.tabBlock);
-	}
 
-	@Override
+    public ItemBlockHint(Block p_i45328_1_) {
-	@SuppressWarnings("unchecked")
+        super(p_i45328_1_);
-	public void addInformation(ItemStack aStack, EntityPlayer aPlayer, List aList, boolean aF3_H) {
+        setMaxDamage(0);
-		aList.add(translateToLocal("structurelib.blockhint.desc.0"));//Helps while building
+        setHasSubtypes(true);
-		switch (aStack.getItemDamage()) {
+        setCreativeTab(CreativeTabs.tabBlock);
-			case 0:
+    }
-			case 1:
-			case 2:
-			case 3:
-			case 4:
-			case 5:
-			case 6:
-			case 7:
-			case 8:
-			case 9:
-			case 10:
-			case 11:
-				aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.1"));//Placeholder for a certain group.
-				break;
-			case 12:
-				aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.2"));//General placeholder.
-				break;
-			case 13:
-				aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.3"));//Make sure it contains Air material.
-				break;
-			case 14:
-				aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.4"));//Make sure it does not contain Air material.
-				break;
-			case 15:
-				aList.add(EnumChatFormatting.BLUE.toString() + translateToLocal("structurelib.blockhint.desc.5"));//ERROR, what did u expect?
-				break;
-			default://WTF?
-				aList.add("Damn son where did you get that!?");
-				aList.add(EnumChatFormatting.BLUE.toString() + "From outer space... I guess...");
-		}
-	}
 
-	public int getMetadata(int aMeta) {
+    @Override
-		return aMeta;
+    public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean adv) {
-	}
+        tooltip.add(translateToLocal("structurelib.blockhint.desc.0")); // Helps while building
+        switch (stack.getItemDamage()) {
+            case 0:
+            case 1:
+            case 2:
+            case 3:
+            case 4:
+            case 5:
+            case 6:
+            case 7:
+            case 8:
+            case 9:
+            case 10:
+            case 11:
+                // Placeholder for a certain group.
+                tooltip.add(
+                        EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
+                                + translateToLocal("structurelib.blockhint.desc.1"));
+                break;
+            case 12:
+                // General placeholder.
+                tooltip.add(
+                        EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
+                                + translateToLocal("structurelib.blockhint.desc.2"));
+                break;
+            case 13:
+                // Make sure it contains Air material.
+                tooltip.add(
+                        EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
+                                + translateToLocal("structurelib.blockhint.desc.3"));
+                break;
+            case 14:
+                // Make sure it does not contain Air material.
+                tooltip.add(
+                        EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
+                                + translateToLocal("structurelib.blockhint.desc.4"));
+                break;
+            case 15:
+                // ERROR, what did u expect?
+                tooltip.add(EnumChatFormatting.BLUE + translateToLocal("structurelib.blockhint.desc.5"));
+                break;
+            default: // WTF?
+                tooltip.add("Damn son where did you get that!?");
+                tooltip.add(EnumChatFormatting.BLUE + "From outer space... I guess...");
+        }
+    }
 
-	public String getUnlocalizedName(ItemStack aStack) {
+    public int getMetadata(int aMeta) {
-		return this.field_150939_a.getUnlocalizedName() + "." + getDamage(aStack);
+        return aMeta;
-	}
+    }
+
+    public String getUnlocalizedName(ItemStack aStack) {
+        return this.field_150939_a.getUnlocalizedName() + "." + getDamage(aStack);
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/item/ItemConstructableTrigger.java

@@ -1,19 +1,25 @@
 package com.gtnewhorizon.structurelib.item;
 
-import com.gtnewhorizon.structurelib.StructureLib;
+import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
-import com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility;
+import static net.minecraft.util.EnumChatFormatting.BLUE;
+import static net.minecraft.util.StatCollector.translateToLocal;
+import static net.minecraft.util.StatCollector.translateToLocalFormatted;
+
+import java.util.List;
+
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.world.World;
 
-import java.util.List;
+import org.lwjgl.input.Keyboard;
 
-import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
+import com.gtnewhorizon.structurelib.StructureLib;
-import static net.minecraft.util.EnumChatFormatting.BLUE;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
-import static net.minecraft.util.StatCollector.translateToLocal;
+import com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility;
 
 public class ItemConstructableTrigger extends Item {
+
     public ItemConstructableTrigger() {
         setUnlocalizedName("structurelib.constructableTrigger");
         setTextureName(MOD_ID + ":itemConstructableTrigger");
@@ -21,17 +27,48 @@ public class ItemConstructableTrigger extends Item {
     }
 
     @Override
-    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ) {
+    public ItemStack onItemRightClick(ItemStack stack, World world, EntityPlayer player) {
+        if (getMovingObjectPositionFromPlayer(world, player, true) == null) {
+            // channel gui is opened from server and config gui from client
+            if (!world.isRemote && !player.isSneaking()) {
+                player.openGui(StructureLib.instance(), 0, world, player.inventory.currentItem, 0, 0);
+            } else if (world.isRemote && player.isSneaking()) {
+                StructureLib.instance().proxy().displayConfigGUI("registries");
+            }
+        }
+        return super.onItemRightClick(stack, world, player);
+    }
+
+    @Override
+    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side,
+            float hitX, float hitY, float hitZ) {
         return ConstructableUtility.handle(stack, player, world, x, y, z, side);
     }
 
-    @SuppressWarnings("unchecked")
     @Override
-    public void addInformation(ItemStack aStack, EntityPlayer ep, List aList, boolean boo) {
+    public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean adv) {
-        aList.add(translateToLocal("item.structurelib.constructableTrigger.desc.0"));//Triggers Constructable Interface
+        if (Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
-        aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.1"));//Shows multiblock construction details,
+            tooltip.add(
-        aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.2"));//just Use on a multiblock controller.
+                    translateToLocalFormatted(
-        aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.3"));//(Sneak Use in creative to build)
+                            "item.structurelib.constructableTrigger.desc.lshift.0",
-        aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.4"));//Quantity affects tier/mode/type
+                            ChannelDataAccessor.countChannelData(stack)));
+            ChannelDataAccessor.iterateChannelData(stack).map(e -> e.getKey() + ": " + e.getValue())
+                    .forEach(tooltip::add);
+        } else {
+            // Tooltip text:
+            // Triggers Constructable Interface
+            // Shows multiblock construction details,
+            // just Use on a multiblock controller.
+            // (Sneak Use in creative to build)
+            // Quantity affects tier/mode/type
+
+            tooltip.add(translateToLocal("item.structurelib.constructableTrigger.desc.0"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.1"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.2"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.3"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.4"));
+            if (ChannelDataAccessor.hasSubChannel(stack))
+                tooltip.add(translateToLocal("item.structurelib.constructableTrigger.desc.5"));
+        }
     }
 }

src/main/java/com/gtnewhorizon/structurelib/item/ItemFrontRotationTool.java

@@ -1,38 +1,47 @@
 package com.gtnewhorizon.structurelib.item;
 
-import com.gtnewhorizon.structurelib.StructureLib;
+import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
-import com.gtnewhorizon.structurelib.alignment.AlignmentUtility;
+import static net.minecraft.util.StatCollector.translateToLocal;
-import cpw.mods.fml.relauncher.Side;
+
-import cpw.mods.fml.relauncher.SideOnly;
+import java.util.List;
+
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumChatFormatting;
 import net.minecraft.world.World;
 
-import java.util.List;
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.AlignmentUtility;
 
-import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
+import cpw.mods.fml.relauncher.Side;
-import static net.minecraft.util.StatCollector.translateToLocal;
+import cpw.mods.fml.relauncher.SideOnly;
 
 public class ItemFrontRotationTool extends Item {
-	public ItemFrontRotationTool() {
-		setMaxStackSize(1);
-		setUnlocalizedName("structurelib.frontRotationTool");
-		setTextureName(MOD_ID + ":itemFrontRotationTool");
-		setCreativeTab(StructureLib.creativeTab);
-	}
 
-	@Override
+    public ItemFrontRotationTool() {
-	public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ) {
+        setMaxStackSize(1);
-		return AlignmentUtility.handle(player, world, x, y, z);
+        setUnlocalizedName("structurelib.frontRotationTool");
-	}
+        setTextureName(MOD_ID + ":itemFrontRotationTool");
+        setCreativeTab(StructureLib.creativeTab);
+    }
 
-	@Override
+    @Override
-	@SideOnly(Side.CLIENT)
+    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side,
-	public void addInformation(ItemStack p_77624_1_, EntityPlayer p_77624_2_, List aList, boolean p_77624_4_) {
+            float hitX, float hitY, float hitZ) {
-		aList.add(translateToLocal("item.structurelib.frontRotationTool.desc.0"));//Triggers Front Rotation Interface
+        return AlignmentUtility.handle(player, world, x, y, z);
-		aList.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.1"));//Rotates only the front panel,
+    }
-		aList.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.2"));//which allows structure rotation.
+
-	}
+    @Override
+    @SideOnly(Side.CLIENT)
+    public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean adv) {
+        // Tooltip Text:
+        // Triggers Front Rotation Interface
+        // Rotates only the front panel,
+        // which allows structure rotation.
+
+        tooltip.add(translateToLocal("item.structurelib.frontRotationTool.desc.0"));
+        tooltip.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.1"));
+        tooltip.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.2"));
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/mixins/TargetedMod.java

@@ -0,0 +1,30 @@
+package com.gtnewhorizon.structurelib.mixins;
+
+import cpw.mods.fml.common.Mod;
+
+public enum TargetedMod {
+
+    VANILLA("Minecraft", null);
+
+    /** The "name" in the {@link Mod @Mod} annotation */
+    public final String modName;
+    /** Class that implements the IFMLLoadingPlugin interface */
+    public final String coreModClass;
+    /** The "modid" in the {@link Mod @Mod} annotation */
+    public final String modId;
+
+    TargetedMod(String modName, String coreModClass) {
+        this(modName, coreModClass, null);
+    }
+
+    TargetedMod(String modName, String coreModClass, String modId) {
+        this.modName = modName;
+        this.coreModClass = coreModClass;
+        this.modId = modId;
+    }
+
+    @Override
+    public String toString() {
+        return "TargetedMod{modName='" + modName + "', coreModClass='" + coreModClass + "', modId='" + modId + "'}";
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/mixins/early/blockChangeNotifier/MixinForgeHooks.java

@@ -0,0 +1,44 @@
+package com.gtnewhorizon.structurelib.mixins.early.blockChangeNotifier;
+
+import net.minecraft.block.Block;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+import net.minecraftforge.common.ForgeHooks;
+import net.minecraftforge.common.util.BlockSnapshot;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.gtnewhorizon.structurelib.event.BlockChangeNotifier;
+import com.llamalad7.mixinextras.sugar.Local;
+
+@Mixin(ForgeHooks.class)
+public class MixinForgeHooks {
+
+    @Inject(
+            method = "onPlaceItemIntoWorld",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/world/World;markAndNotifyBlock(IIILnet/minecraft/world/chunk/Chunk;Lnet/minecraft/block/Block;Lnet/minecraft/block/Block;I)V",
+                    shift = At.Shift.AFTER),
+            remap = false)
+    private static void onBlockChange(ItemStack itemstack, EntityPlayer player, World world, int x, int y, int z,
+            int side, float hitX, float hitY, float hitZ, CallbackInfoReturnable<Boolean> cir,
+            @Local(name = "blocksnapshot") BlockSnapshot blocksnapshot, @Local(name = "newBlock") Block newBlock,
+            @Local(name = "metadata") int newMetadata) {
+        BlockChangeNotifier.onBlockChange(
+                world,
+                null,
+                blocksnapshot.x,
+                blocksnapshot.y,
+                blocksnapshot.z,
+                blocksnapshot.replacedBlock,
+                newBlock,
+                blocksnapshot.meta,
+                newMetadata);
+    }
+
+}

src/main/java/com/gtnewhorizon/structurelib/mixins/early/blockChangeNotifier/MixinWorld.java

@@ -0,0 +1,55 @@
+package com.gtnewhorizon.structurelib.mixins.early.blockChangeNotifier;
+
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.gtnewhorizon.structurelib.event.BlockChangeNotifier;
+import com.llamalad7.mixinextras.sugar.Local;
+import com.llamalad7.mixinextras.sugar.Share;
+import com.llamalad7.mixinextras.sugar.ref.LocalIntRef;
+import com.llamalad7.mixinextras.sugar.ref.LocalRef;
+
+@Mixin(World.class)
+public class MixinWorld {
+
+    @Inject(
+            method = "Lnet/minecraft/world/World;setBlock(IIILnet/minecraft/block/Block;II)Z",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/world/World;markAndNotifyBlock(IIILnet/minecraft/world/chunk/Chunk;Lnet/minecraft/block/Block;Lnet/minecraft/block/Block;I)V",
+                    shift = At.Shift.AFTER,
+                    remap = false))
+    public void setBlockObserve(int x, int y, int z, Block newBlock, int newMeta, int flags,
+            CallbackInfoReturnable<Boolean> cir, @Local(name = "block1") Block originalBlock,
+            @Share("originalMeta") LocalIntRef originalMeta, @Share("chunk") LocalRef<Chunk> chunkLocalRef) {
+        BlockChangeNotifier.onBlockChange(
+                (World) ((Object) (this)),
+                chunkLocalRef.get(),
+                x,
+                y,
+                z,
+                originalBlock,
+                newBlock,
+                originalMeta.get(),
+                newMeta);
+    }
+
+    @Inject(
+            method = "Lnet/minecraft/world/World;setBlock(IIILnet/minecraft/block/Block;II)Z",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/world/chunk/Chunk;func_150807_a(IIILnet/minecraft/block/Block;I)Z",
+                    shift = At.Shift.BEFORE))
+    public void captureChunkAndOriginalMetadata(int x, int y, int z, Block blockIn, int metadataIn, int flags,
+            CallbackInfoReturnable<Boolean> cir, @Local(name = "chunk") Chunk chunk,
+            @Share("originalMeta") LocalIntRef originalMeta, @Share("chunk") LocalRef<Chunk> chunkLocalRef) {
+        chunkLocalRef.set(chunk);
+        originalMeta.set(chunk.getBlockMetadata(x & 15, y, z & 15));
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/net/AlignmentMessage.java

@@ -1,28 +1,30 @@
 package com.gtnewhorizon.structurelib.net;
 
-import com.gtnewhorizon.structurelib.StructureLib;
-import com.gtnewhorizon.structurelib.alignment.IAlignment;
-import com.gtnewhorizon.structurelib.alignment.IAlignmentProvider;
-import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
-import cpw.mods.fml.common.network.ByteBufUtils;
-import cpw.mods.fml.common.network.simpleimpl.IMessage;
-import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
-import cpw.mods.fml.common.network.simpleimpl.MessageContext;
-import io.netty.buffer.ByteBuf;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.world.World;
 import net.minecraftforge.common.DimensionManager;
 
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.IAlignment;
+import com.gtnewhorizon.structurelib.alignment.IAlignmentProvider;
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+
+import cpw.mods.fml.common.network.ByteBufUtils;
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import io.netty.buffer.ByteBuf;
+
 public abstract class AlignmentMessage implements IMessage {
+
     int mPosX;
     int mPosY;
     int mPosZ;
     int mPosD;
     int mAlign;
 
-    public AlignmentMessage() {
+    public AlignmentMessage() {}
-    }
 
     @Override
     public void fromBytes(ByteBuf pBuffer) {
@@ -47,11 +49,9 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     private AlignmentMessage(IAlignmentProvider provider) {
-        if (!(provider instanceof TileEntity))
+        if (!(provider instanceof TileEntity)) throw new IllegalArgumentException("Provider must be a TileEntity");
-            throw new IllegalArgumentException("Provider must be a TileEntity");
         IAlignment alignment = provider.getAlignment();
-        if (alignment == null)
+        if (alignment == null) throw new IllegalArgumentException("Passed in provider does not provide an alignment!");
-            throw new IllegalArgumentException("Passed in provider does not provide an alignment!");
         TileEntity base = (TileEntity) provider;
         mPosX = base.xCoord;
         mPosY = base.yCoord;
@@ -69,8 +69,8 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     public static class AlignmentQuery extends AlignmentMessage {
-        public AlignmentQuery() {
+
-        }
+        public AlignmentQuery() {}
 
         public AlignmentQuery(IAlignmentProvider provider) {
             super(provider);
@@ -82,8 +82,8 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     public static class AlignmentData extends AlignmentMessage {
-        public AlignmentData() {
+
-        }
+        public AlignmentData() {}
 
         private AlignmentData(AlignmentQuery query) {
             mPosX = query.mPosX;
@@ -103,10 +103,12 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     public static class ClientHandler implements IMessageHandler<AlignmentData, IMessage> {
+
         @Override
         public IMessage onMessage(AlignmentData pMessage, MessageContext pCtx) {
             if (StructureLib.getCurrentPlayer().worldObj.provider.dimensionId == pMessage.mPosD) {
-                TileEntity te = StructureLib.getCurrentPlayer().worldObj.getTileEntity(pMessage.mPosX, pMessage.mPosY, pMessage.mPosZ);
+                TileEntity te = StructureLib.getCurrentPlayer().worldObj
+                        .getTileEntity(pMessage.mPosX, pMessage.mPosY, pMessage.mPosZ);
                 if (te instanceof IAlignmentProvider) {
                     IAlignment alignment = ((IAlignmentProvider) te).getAlignment();
                     if (alignment != null) {
@@ -119,6 +121,7 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     public static class ServerHandler implements IMessageHandler<AlignmentQuery, AlignmentData> {
+
         @Override
         public AlignmentData onMessage(AlignmentQuery pMessage, MessageContext pCtx) {
             World world = DimensionManager.getWorld(pMessage.mPosD);
@@ -126,8 +129,7 @@ public abstract class AlignmentMessage implements IMessage {
                 TileEntity te = world.getTileEntity(pMessage.mPosX, pMessage.mPosY, pMessage.mPosZ);
                 if (te instanceof IAlignmentProvider) {
                     IAlignment alignment = ((IAlignmentProvider) te).getAlignment();
-                    if (alignment == null)
+                    if (alignment == null) return null;
-                        return null;
                     pMessage.mAlign = alignment.getExtendedFacing().getIndex();
                     return new AlignmentData(pMessage);
                 }
@@ -135,4 +137,4 @@ public abstract class AlignmentMessage implements IMessage {
             return null;
         }
     }
-}
+}

src/main/java/com/gtnewhorizon/structurelib/net/ErrorHintParticleMessage.java

@@ -0,0 +1,60 @@
+package com.gtnewhorizon.structurelib.net;
+
+import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import io.netty.buffer.ByteBuf;
+
+public class ErrorHintParticleMessage implements IMessage {
+
+    private int x;
+    private short y;
+    private int z;
+
+    public ErrorHintParticleMessage() {}
+
+    public ErrorHintParticleMessage(int x, short y, int z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        x = buf.readInt();
+        y = buf.readShort();
+        z = buf.readInt();
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        buf.writeInt(x);
+        buf.writeShort(y);
+        buf.writeInt(z);
+    }
+
+    public static class Handler implements IMessageHandler<ErrorHintParticleMessage, IMessage> {
+
+        @Override
+        public IMessage onMessage(ErrorHintParticleMessage msg, MessageContext ctx) {
+            boolean updateResult = StructureLibAPI.markHintParticleError(
+                    StructureLib.getCurrentPlayer(),
+                    StructureLib.getCurrentPlayer().worldObj,
+                    msg.x,
+                    msg.y,
+                    msg.z);
+            if (StructureLibAPI.isDebugEnabled()) LOGGER.debug(
+                    "Server instructed to mark hint particle at ({}, {}, {}) error, result {}!",
+                    msg.x,
+                    msg.y,
+                    msg.z,
+                    updateResult);
+            return null;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/net/RegistryOrderSyncMessage.java

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib.net;
+
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
+
+import com.gtnewhorizon.structurelib.SortedRegistry;
+
+import cpw.mods.fml.common.network.ByteBufUtils;
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import io.netty.buffer.ByteBuf;
+
+public class RegistryOrderSyncMessage implements IMessage {
+
+    private String name;
+    private List<String> order;
+    private List<String> disabled;
+
+    public RegistryOrderSyncMessage() {}
+
+    public RegistryOrderSyncMessage(String name, List<String> order, List<String> disabled) {
+        this.name = name;
+        this.order = order;
+        this.disabled = disabled;
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        name = ByteBufUtils.readUTF8String(buf);
+        int size = ByteBufUtils.readVarInt(buf, 2);
+        order = new ArrayList<>(size);
+        for (int i = 0; i < size; i++) {
+            order.add(ByteBufUtils.readUTF8String(buf));
+        }
+        size = ByteBufUtils.readVarInt(buf, 2);
+        disabled = new ArrayList<>(size);
+        for (int i = 0; i < size; i++) {
+            disabled.add(ByteBufUtils.readUTF8String(buf));
+        }
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        ByteBufUtils.writeUTF8String(buf, name);
+        ByteBufUtils.writeVarInt(buf, order.size(), 2);
+        for (String s : order) {
+            ByteBufUtils.writeUTF8String(buf, s);
+        }
+        ByteBufUtils.writeVarInt(buf, disabled.size(), 2);
+        for (String s : disabled) {
+            ByteBufUtils.writeUTF8String(buf, s);
+        }
+    }
+
+    public static class Handler implements IMessageHandler<RegistryOrderSyncMessage, IMessage> {
+
+        private static ConcurrentHashMap<String, WeakReference<SortedRegistry<?>>> ALL_REGISTRIES;
+
+        public static void setAllRegistries(ConcurrentHashMap<String, WeakReference<SortedRegistry<?>>> r) {
+            if (ALL_REGISTRIES == null) ALL_REGISTRIES = r;
+        }
+
+        @Override
+        public IMessage onMessage(RegistryOrderSyncMessage message, MessageContext ctx) {
+            if (ALL_REGISTRIES == null) return null;
+            WeakReference<SortedRegistry<?>> ref = ALL_REGISTRIES.get(message.name);
+            if (ref == null) return null;
+            SortedRegistry<?> r = ref.get();
+            if (r == null) return null;
+            r.registerOrdering(ctx.getServerHandler().playerEntity, message.order, message.disabled);
+            return null;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/net/SetChannelDataMessage.java

@@ -0,0 +1,73 @@
+package com.gtnewhorizon.structurelib.net;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+
+import org.apache.commons.lang3.tuple.Pair;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+
+import cpw.mods.fml.common.network.ByteBufUtils;
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import io.netty.buffer.ByteBuf;
+
+public class SetChannelDataMessage implements IMessage {
+
+    private final List<Map.Entry<String, Integer>> data = new ArrayList<>();
+
+    public SetChannelDataMessage() {}
+
+    public SetChannelDataMessage(ItemStack trigger) {
+        ChannelDataAccessor.iterateChannelData(trigger).forEach(data::add);
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        data.clear();
+        int size = ByteBufUtils.readVarShort(buf);
+        for (int i = 0; i < size; i++) {
+            data.add(Pair.of(ByteBufUtils.readUTF8String(buf), ByteBufUtils.readVarInt(buf, 4)));
+        }
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        ByteBufUtils.writeVarShort(buf, data.size());
+        for (Entry<String, Integer> e : data) {
+            ByteBufUtils.writeUTF8String(buf, e.getKey());
+            ByteBufUtils.writeVarInt(buf, e.getValue(), 4);
+        }
+    }
+
+    public static class Handler implements IMessageHandler<SetChannelDataMessage, IMessage> {
+
+        @Override
+        public IMessage onMessage(SetChannelDataMessage message, MessageContext ctx) {
+            EntityPlayerMP player = ctx.getServerHandler().playerEntity;
+            ItemStack heldItem = player.getHeldItem();
+            if (heldItem != null && heldItem.getItem() instanceof ItemConstructableTrigger) {
+                ChannelDataAccessor.wipeChannelData(heldItem);
+                for (Entry<String, Integer> e : message.data) {
+                    ChannelDataAccessor.setChannelData(heldItem, e.getKey(), e.getValue());
+                }
+                // since this is a set all channel request from the client, we would assume client already know
+                // what this would look like on the client, so no sync
+            } else {
+                StructureLib.LOGGER.warn(
+                        "{} trying to set channel data on {}, which is not a hologram projector!",
+                        player.getUniqueID(),
+                        heldItem);
+            }
+            return null;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/net/UpdateHintParticleMessage.java

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib.net;
+
+import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import io.netty.buffer.ByteBuf;
+
+public class UpdateHintParticleMessage implements IMessage {
+
+    private int x;
+    private short y;
+    private int z;
+    private short r;
+    private short g;
+    private short b;
+    private short a;
+
+    public UpdateHintParticleMessage() {}
+
+    public UpdateHintParticleMessage(int x, short y, int z, short r, short g, short b, short a) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.r = r;
+        this.g = g;
+        this.b = b;
+        this.a = a;
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        x = buf.readInt();
+        y = buf.readShort();
+        z = buf.readInt();
+        r = buf.readUnsignedByte();
+        g = buf.readUnsignedByte();
+        b = buf.readUnsignedByte();
+        a = buf.readUnsignedByte();
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        buf.writeInt(x);
+        buf.writeShort(y);
+        buf.writeInt(z);
+        buf.writeByte(r);
+        buf.writeByte(g);
+        buf.writeByte(b);
+        buf.writeByte(a);
+    }
+
+    public static class Handler implements IMessageHandler<UpdateHintParticleMessage, IMessage> {
+
+        @Override
+        public IMessage onMessage(UpdateHintParticleMessage msg, MessageContext ctx) {
+            boolean updateResult = StructureLibAPI.updateHintParticleTint(
+                    StructureLib.getCurrentPlayer(),
+                    StructureLib.getCurrentPlayer().worldObj,
+                    msg.x,
+                    msg.y,
+                    msg.z,
+                    new short[] { msg.r, msg.g, msg.b, msg.a, });
+            if (StructureLibAPI.isDebugEnabled()) LOGGER.debug(
+                    "Server instructed to update hint particle at ({}, {}, {}), result {}!",
+                    msg.x,
+                    msg.y,
+                    msg.z,
+                    updateResult);
+            return null;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/proxy/ClientProxy.java

@@ -1,187 +0,0 @@
-package com.gtnewhorizon.structurelib.proxy;
-
-import com.google.common.collect.BiMap;
-import com.google.common.collect.HashBiMap;
-import com.gtnewhorizon.structurelib.ConfigurationHandler;
-import com.gtnewhorizon.structurelib.entity.fx.EntityFXBlockHint;
-import com.gtnewhorizon.structurelib.entity.fx.WeightlessParticleFX;
-import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import cpw.mods.fml.common.eventhandler.SubscribeEvent;
-import net.minecraft.block.Block;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.GuiNewChat;
-import net.minecraft.client.particle.EntityFX;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.util.ChatComponentText;
-import net.minecraft.util.IIcon;
-import net.minecraft.world.World;
-import net.minecraftforge.common.MinecraftForge;
-import net.minecraftforge.event.world.WorldEvent;
-
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-
-import static com.gtnewhorizon.structurelib.StructureLib.RANDOM;
-
-public class ClientProxy extends CommonProxy {
-    @Override
-    public void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {
-        EntityFXBlockHint hint = new EntityFXBlockHint(w, x, y, z, icons).withColorTint(RGBa);
-        Minecraft.getMinecraft().effectRenderer.addEffect(hint);
-        ensureHinting();
-        if (ConfigurationHandler.INSTANCE.isRemoveCollidingHologram()) {
-            HintParticleInfo info = new HintParticleInfo(x, y, z, currentHints);
-            EntityFXBlockHint dupe = allHints.inverse().get(info);
-            if (dupe != null) {
-                List<EntityFXBlockHint> owner = allHints.get(dupe).owner;
-                // in case someone forget to call endHinting
-                if (owner != currentHints) {
-                    hintOwners.remove(owner);
-                    owner.forEach(EntityFXBlockHint::setDead);
-                    owner.clear();
-                }
-            }
-            allHints.forcePut(hint, info);
-        }
-        currentHints.add(hint);
-
-        EntityFX particle = new WeightlessParticleFX(w, x + RANDOM.nextFloat() * 0.5F, y + RANDOM.nextFloat() * 0.5F, z + RANDOM.nextFloat() * 0.5F, 0, 0, 0);
-        particle.setRBGColorF(0, 0.6F * RANDOM.nextFloat(), 0.8f);
-        Minecraft.getMinecraft().effectRenderer.addEffect(particle);
-    }
-
-    @Override
-    public void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa) {
-        hintParticleTinted(w, x, y, z, createIIconFromBlock(block, meta), RGBa);
-    }
-
-    @Override
-    public void hintParticle(World w, int x, int y, int z, IIcon[] icons) {
-        hintParticleTinted(w, x, y, z, icons, new short[]{255, 255, 255, 0});
-    }
-
-    @Override
-    public void hintParticle(World w, int x, int y, int z, Block block, int meta) {
-        hintParticleTinted(w, x, y, z, createIIconFromBlock(block, meta), new short[]{255, 255, 255, 0});
-    }
-
-    private static IIcon[] createIIconFromBlock(Block block, int meta) {
-        IIcon[] ret = new IIcon[6];
-        for (int i = 0; i < 6; i++) {
-            ret[i] = block.getIcon(i, meta);
-        }
-        return ret;
-    }
-
-    @Override
-    public void addClientSideChatMessages(String... messages) {
-        GuiNewChat chat = Minecraft.getMinecraft().ingameGUI.getChatGUI();
-        for (String s : messages) {
-            chat.printChatMessage(new ChatComponentText(s));
-        }
-    }
-
-    @Override
-    public EntityPlayer getCurrentPlayer() {
-        return Minecraft.getMinecraft().thePlayer;
-    }
-
-    @Override
-    public boolean isCurrentPlayer(EntityPlayer player) {
-        return player == Minecraft.getMinecraft().thePlayer;
-    }
-
-    private static final BiMap<EntityFXBlockHint, HintParticleInfo> allHints = HashBiMap.create();
-    private static final List<List<EntityFXBlockHint>> hintOwners = new ArrayList<>();
-    private static List<EntityFXBlockHint> currentHints;
-
-    public static void onHintDead(EntityFXBlockHint fx) {
-        if (ConfigurationHandler.INSTANCE.isRemoveCollidingHologram())
-            allHints.remove(fx);
-        for (Iterator<List<EntityFXBlockHint>> iterator = hintOwners.iterator(); iterator.hasNext(); ) {
-            List<EntityFXBlockHint> list = iterator.next();
-            if (list.remove(fx)) {
-                if (list.isEmpty())
-                    iterator.remove();
-                break;
-            }
-        }
-    }
-
-    @Override
-    public void startHinting(World w) {
-        if (!w.isRemote)
-            return;
-        if (currentHints != null)
-            hintOwners.add(currentHints);
-        currentHints = new LinkedList<>();
-    }
-
-    private void ensureHinting() {
-        if (currentHints == null)
-            currentHints = new LinkedList<>();
-    }
-
-    @Override
-    public void endHinting(World w) {
-        if (!w.isRemote)
-            return;
-        while (!hintOwners.isEmpty() && hintOwners.size() >= ConfigurationHandler.INSTANCE.getMaxCoexistingHologram()) {
-            List<EntityFXBlockHint> list = hintOwners.remove(0);
-            list.forEach(EntityFXBlockHint::setDead);
-            list.clear();
-        }
-        if (!currentHints.isEmpty())
-            hintOwners.add(currentHints);
-        currentHints = null;
-    }
-
-    @Override
-    public void preInit(FMLPreInitializationEvent e) {
-        MinecraftForge.EVENT_BUS.register(new ForgeEventHandler());
-    }
-
-    private static class HintParticleInfo {
-        private final int x, y, z;
-        private final List<EntityFXBlockHint> owner;
-
-        public HintParticleInfo(int x, int y, int z, List<EntityFXBlockHint> owner) {
-            this.x = x;
-            this.y = y;
-            this.z = z;
-            this.owner = owner;
-        }
-
-        @Override
-        public boolean equals(Object o) {
-            if (this == o) return true;
-            if (o == null || getClass() != o.getClass()) return false;
-
-            HintParticleInfo that = (HintParticleInfo) o;
-
-            if (x != that.x) return false;
-            if (y != that.y) return false;
-            return z == that.z;
-        }
-
-        @Override
-        public int hashCode() {
-            int result = x;
-            result = 31 * result + y;
-            result = 31 * result + z;
-            return result;
-        }
-    }
-
-    public static class ForgeEventHandler {
-        @SubscribeEvent
-        public void onWorldLoad(WorldEvent.Load e) {
-            if (e.world.isRemote) {
-                allHints.clear();
-                hintOwners.clear();
-            }
-        }
-    }
-}

src/main/java/com/gtnewhorizon/structurelib/proxy/CommonProxy.java

@@ -1,26 +0,0 @@
-package com.gtnewhorizon.structurelib.proxy;
-
-import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import net.minecraft.block.Block;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.util.IIcon;
-import net.minecraft.world.World;
-
-public class CommonProxy {
-	public void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa){}
-	public void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa){}
-	public void hintParticle(World w, int x, int y, int z, IIcon[] icons){}
-	public void hintParticle(World w, int x, int y, int z, Block block, int meta){}
-	public EntityPlayer getCurrentPlayer() {
-		return null;
-	}
-	public boolean isCurrentPlayer(EntityPlayer player) {
-		return false;
-	}
-	public void addClientSideChatMessages(String... messages){
-	}
-	public void startHinting(World w) {}
-	public void endHinting(World w) {}
-
-	public void preInit(FMLPreInitializationEvent e) {}
-}

src/main/java/com/gtnewhorizon/structurelib/structure/AutoPlaceEnvironment.java

@@ -0,0 +1,231 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import java.util.Map;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+
+import javax.annotation.Nonnull;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
+
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+
+/**
+ * Represent the environment in which autoplace of a single element took place.
+ */
+public class AutoPlaceEnvironment {
+
+    private IItemSource source;
+    private final EntityPlayer actor;
+    private final Consumer<IChatComponent> chatter;
+    private final IStructureDefinition<?> definition;
+    private final String piece;
+    private final ExtendedFacing facing;
+    final int[] offsetABC;
+    private final int[] baseOffsetABC;
+
+    public static AutoPlaceEnvironment fromLegacy(IItemSource source, EntityPlayer actor,
+            Consumer<IChatComponent> chatter) {
+        if (source instanceof WrappedIItemSource) {
+            AutoPlaceEnvironment original = ((WrappedIItemSource) source).container;
+            // feels like this is extremely likely to cause issues, but this does allow us to recover lost info.
+            // TODO probably should remove this once all addons migrate over
+            if (actor != original.actor || chatter != original.chatter) {
+                AutoPlaceEnvironment newEnv = original;
+                if (actor != original.actor) newEnv = newEnv.withActor(actor);
+                if (chatter != original.chatter) newEnv = newEnv.withChatter(chatter);
+                return newEnv;
+            }
+            return original;
+        }
+        return new AutoPlaceEnvironment(source, actor, chatter, null, null, null, null, null);
+    }
+
+    AutoPlaceEnvironment(EntityPlayer actor, Consumer<IChatComponent> chatter, IStructureDefinition<?> definition,
+            String piece, ExtendedFacing facing, int[] baseOffsetABC) {
+        this.source = null;
+        this.actor = actor;
+        this.chatter = chatter;
+        this.definition = definition;
+        this.piece = piece;
+        this.facing = facing;
+        this.offsetABC = new int[3];
+        this.baseOffsetABC = baseOffsetABC;
+    }
+
+    AutoPlaceEnvironment(IItemSource source, EntityPlayer actor, Consumer<IChatComponent> chatter,
+            IStructureDefinition<?> definition, String piece, ExtendedFacing facing, int[] offsetABC,
+            int[] baseOffsetABC) {
+        this.source = definition != null && !(source instanceof WrappedIItemSource)
+                ? new WrappedIItemSource(this, source)
+                : source;
+        this.actor = actor;
+        this.chatter = chatter;
+        this.definition = definition;
+        this.piece = piece;
+        this.facing = facing;
+        this.offsetABC = offsetABC;
+        this.baseOffsetABC = baseOffsetABC;
+    }
+
+    protected AutoPlaceEnvironment(AutoPlaceEnvironment parent) {
+        this(
+                parent.getSource(),
+                parent.getActor(),
+                parent.getChatter(),
+                parent.definition,
+                parent.piece,
+                parent.facing,
+                parent.offsetABC,
+                parent.baseOffsetABC);
+    }
+
+    void setSource(IItemSource source) {
+        this.source = definition != null && !(source instanceof WrappedIItemSource)
+                ? new WrappedIItemSource(this, source)
+                : source;
+    }
+
+    public APILevel getAPILevel() {
+        return definition == null ? actor instanceof EntityPlayerMP ? APILevel.Legacy : APILevel.LegacyRelaxed
+                : APILevel.V2;
+    }
+
+    /**
+     * From where survival autoplace will drain resources.
+     */
+    public IItemSource getSource() {
+        return source;
+    }
+
+    /**
+     * The initiator of actions. for very critical errors you can also just send the error messages here, bypassing any
+     * filter that {@link #getChatter()} might have. You might want to use
+     * {@link com.gtnewhorizon.structurelib.StructureLibAPI#addThrottledChat(Object, EntityPlayer, IChatComponent, short)}
+     * to help reduce spam.
+     */
+    public EntityPlayer getActor() {
+        return actor;
+    }
+
+    /**
+     * send error messages here. Caller will choose an appropriate way to forward it to player if the other fallbacks
+     * also fails.
+     */
+    public Consumer<IChatComponent> getChatter() {
+        return chatter;
+    }
+
+    /**
+     * Test if given location is contained within the current piece.
+     *
+     * @param offsetA offset in A direction <b>relative to current element</b>
+     * @param offsetB offset in B direction <b>relative to current element</b>
+     * @param offsetC offset in C direction <b>relative to current element</b>
+     * @return true if contained, false otherwise.
+     */
+    public boolean isContainedInPiece(int offsetA, int offsetB, int offsetC) {
+        if (definition == null) return false;
+        return definition.isContainedInStructure(
+                piece,
+                offsetABC[0] + offsetA + baseOffsetABC[0],
+                offsetABC[1] + offsetB + baseOffsetABC[1],
+                offsetABC[2] + offsetC + baseOffsetABC[2]);
+    }
+
+    public ExtendedFacing getFacing() {
+        return facing;
+    }
+
+    /**
+     * Return a new instance with source modified to given value.
+     *
+     * @param source new source
+     * @return new instance
+     */
+    public AutoPlaceEnvironment withSource(IItemSource source) {
+        return new AutoPlaceEnvironment(source, actor, chatter, definition, piece, facing, offsetABC, baseOffsetABC);
+    }
+
+    /**
+     * Return a new instance with actor modified to given value.
+     *
+     * @param actor new actor
+     * @return new instance
+     */
+    public AutoPlaceEnvironment withActor(EntityPlayer actor) {
+        return new AutoPlaceEnvironment(source, actor, chatter, definition, piece, facing, offsetABC, baseOffsetABC);
+    }
+
+    /**
+     * Return a new instance with chatter modified to given value.
+     *
+     * @param chatter new chatter
+     * @return new instance
+     */
+    public AutoPlaceEnvironment withChatter(Consumer<IChatComponent> chatter) {
+        return new AutoPlaceEnvironment(source, actor, chatter, definition, piece, facing, offsetABC, baseOffsetABC);
+    }
+
+    private static class WrappedIItemSource implements IItemSource {
+
+        final AutoPlaceEnvironment container;
+        final IItemSource delegate;
+
+        public WrappedIItemSource(AutoPlaceEnvironment container, IItemSource delegate) {
+            this.container = container;
+            this.delegate = delegate;
+        }
+
+        @Override
+        @Nonnull
+        public Map<ItemStack, Integer> take(Predicate<ItemStack> predicate, boolean simulate, int count) {
+            return delegate.take(predicate, simulate, count);
+        }
+
+        @Override
+        public ItemStack takeOne(Predicate<ItemStack> predicate, boolean simulate) {
+            return delegate.takeOne(predicate, simulate);
+        }
+
+        @Override
+        public boolean takeAll(Predicate<ItemStack> predicate, boolean simulate, int count) {
+            return delegate.takeAll(predicate, simulate, count);
+        }
+
+        @Override
+        public boolean takeOne(ItemStack stack, boolean simulate) {
+            return delegate.takeOne(stack, simulate);
+        }
+
+        @Override
+        public boolean takeAll(ItemStack stack, boolean simulate) {
+            return delegate.takeAll(stack, simulate);
+        }
+    }
+
+    /**
+     * Defines the various API level an {@link AutoPlaceEnvironment} has implemented.
+     * <p>
+     * Enum constants are defined in chronological order.
+     */
+    public enum APILevel {
+        /**
+         * Implements {@link #getChatter()}, {@link #getActor()} and {@link #getSource()}. {@link #getActor()} is
+         * guaranteed to be an {@link net.minecraft.entity.player.EntityPlayerMP}
+         */
+        Legacy,
+        /**
+         * Implements {@link #getChatter()}, {@link #getActor()} and {@link #getSource()}. {@link #getActor()} is
+         * <b>NOT</b> guaranteed to be an {@link net.minecraft.entity.player.EntityPlayerMP}
+         */
+        LegacyRelaxed,
+        /**
+         * Implements everything so far we have defined.
+         */
+        V2,
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/ChatThrottleKey.java

@@ -0,0 +1,29 @@
+package com.gtnewhorizon.structurelib.structure;
+
+class ChatThrottleKey {
+
+    static class NoExplicitChannel {
+
+        private static final int hashOffset = NoExplicitChannel.class.hashCode();
+        private final String subchannel;
+
+        public NoExplicitChannel(String subchannel) {
+            this.subchannel = subchannel;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (!(o instanceof NoExplicitChannel that)) return false;
+
+            return subchannel.equals(that.subchannel);
+        }
+
+        @Override
+        public int hashCode() {
+            // as this one will be placed within a map along with instances of different classes, it'd be best to add
+            // an offset based off class type to avoid collision
+            return subchannel.hashCode() + hashOffset;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/DefaultSurvivalBuildEnvironment.java

@@ -0,0 +1,24 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import net.minecraft.entity.player.EntityPlayer;
+
+class DefaultSurvivalBuildEnvironment implements ISurvivalBuildEnvironment {
+
+    private final IItemSource source;
+    private final EntityPlayer actor;
+
+    public DefaultSurvivalBuildEnvironment(IItemSource source, EntityPlayer actor) {
+        this.source = source;
+        this.actor = actor;
+    }
+
+    @Override
+    public IItemSource getSource() {
+        return source;
+    }
+
+    @Override
+    public EntityPlayer getActor() {
+        return actor;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/IBlockPosConsumer.java

@@ -3,5 +3,6 @@ package com.gtnewhorizon.structurelib.structure;
 import net.minecraft.world.World;
 
 public interface IBlockPosConsumer {
-	void consume(World world, int x, int y, int z);
+
+    void consume(World world, int x, int y, int z);
 }

src/main/java/com/gtnewhorizon/structurelib/structure/ICustomBlockSetting.java

@@ -4,15 +4,16 @@ import net.minecraft.block.Block;
 import net.minecraft.world.World;
 
 public interface ICustomBlockSetting {
-	/**
+
-	 * Default block setting calls {@link World#setBlock(int x, int y, int z, Block block, int meta, int updateType)} like:
+    /**
-	 * {@code world.setBlock(x,y,z,this/block,meta,2)} where updateType 2 means to update lighting and stuff
+     * Default block setting calls {@link World#setBlock(int x, int y, int z, Block block, int meta, int updateType)}
-	 *
+     * like: {@code world.setBlock(x,y,z,this/block,meta,2)} where updateType 2 means to update lighting and stuff
-	 * @param world world that should be affected
+     *
-	 * @param x     x position to set
+     * @param world world that should be affected
-	 * @param y     y position to set
+     * @param x     x position to set
-	 * @param z     z position to set
+     * @param y     y position to set
-	 * @param meta  required meta
+     * @param z     z position to set
-	 */
+     * @param meta  required meta
-	void setBlock(World world, int x, int y, int z, int meta);
+     */
+    void setBlock(World world, int x, int y, int z, int meta);
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IItemSource.java

@@ -0,0 +1,146 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import java.util.Map;
+import java.util.function.Predicate;
+
+import javax.annotation.Nonnull;
+
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.inventory.IInventory;
+import net.minecraft.item.ItemStack;
+
+import com.gtnewhorizon.structurelib.util.InventoryIterable;
+import com.gtnewhorizon.structurelib.util.InventoryUtility;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
+
+/**
+ * Represent an item source. Take only, cannot be placed back.
+ */
+public interface IItemSource {
+
+    /**
+     * Retrieve some amount of items from this item source matching given filter.
+     * <p>
+     * We probably don't need to get a lot of items from this method, so I don't care about the overhead of storing all
+     * fetched items even if downstream code doesn't need it
+     *
+     * @param predicate filtering predicate. should return true for ItemStacks that should be added to result collection
+     * @param simulate  whether to actually commit the modification. true for dry run, false otherwise.
+     * @param count     how many items to extract.
+     * @return A nonnull map reflecting the result of extraction. Note this map is NBT and metadata aware.
+     */
+    @Nonnull
+    Map<ItemStack, Integer> take(Predicate<ItemStack> predicate, boolean simulate, int count);
+
+    /**
+     * Take exactly one item that matches the predicate.
+     *
+     * @param predicate filtering predicate. should return true for ItemStacks that should be added to result collection
+     * @param simulate  whether to actually commit the modification. true for dry run, false otherwise.
+     * @return item stack, or null if none matches
+     * @throws IllegalArgumentException if given predicate is null.
+     */
+    default ItemStack takeOne(Predicate<ItemStack> predicate, boolean simulate) {
+        if (predicate == null) throw new IllegalArgumentException();
+        Map<ItemStack, Integer> take = take(predicate, simulate, 1);
+        return take.isEmpty() ? null : take.keySet().iterator().next();
+    }
+
+    /**
+     * Take exactly count amount of items matching predicate.
+     *
+     * @param predicate filtering predicate. should return true for ItemStacks that should be added to result collection
+     * @param simulate  whether to actually commit the modification. true for dry run, false otherwise.
+     * @param count     how many items to extract.
+     * @return true if at least count amount of items can be/is taken.
+     * @throws IllegalArgumentException if given predicate is null
+     */
+    default boolean takeAll(Predicate<ItemStack> predicate, boolean simulate, int count) {
+        // fast path for 1 item take requests
+        if (count == 1) return takeOne(predicate, simulate) != null;
+        Map<ItemStack, Integer> have = take(predicate, true, count);
+        if (have.values().stream().mapToInt(Integer::intValue).sum() < count) return false;
+        take(predicate, simulate, count);
+        return true;
+    }
+
+    /**
+     * Take exactly one item. ItemStack given must have a stack size of 1.
+     * <p>
+     * This is meant to be an optimized version of {@link #takeOne(Predicate, boolean)}. Implementations that support
+     * item storage indexed by ItemStack can use this to speed up calculation.
+     *
+     * @param stack    what item to extract. The NBT tag of this ItemStack is siginifcant and will be considered during
+     *                 matching. must have a stack size of 1.
+     * @param simulate whether to actually commit the modification. true for dry run, false otherwise.
+     * @return true if found. false otherwise
+     * @throws IllegalArgumentException if given stack is invalid, or has a stack size other than 1.
+     */
+    default boolean takeOne(ItemStack stack, boolean simulate) {
+        if (stack == null || stack.getItem() == null || stack.stackSize != 1) throw new IllegalArgumentException();
+        ItemStack took = takeOne(ItemStackPredicate.from(stack, NBTMode.EXACT), simulate);
+        return took != null && took.stackSize > 0;
+    }
+
+    /**
+     * Take some item. Will not take item if it cannot find enough items to take.
+     * <p>
+     * This is meant to be an optimized version of {@link #takeOne(Predicate, boolean)}. Implementations that support
+     * indexing off ItemStack can use this to speed up calculation.
+     *
+     * @param stack    what item and how many to extract. The NBT tag of this ItemStack is siginifcant and will be
+     *                 considered during matching
+     * @param simulate whether to actually commit the modification. true for dry run, false otherwise.
+     * @return true if enough item can be/has been extracted. false otherwise
+     * @throws IllegalArgumentException if given stack is invalid
+     */
+    default boolean takeAll(ItemStack stack, boolean simulate) {
+        if (stack == null || stack.getItem() == null) throw new IllegalArgumentException();
+        // fast path for 1 item take requests
+        if (stack.stackSize == 1) return takeOne(stack, simulate);
+        ItemStackPredicate predicate = ItemStackPredicate.from(stack, NBTMode.EXACT);
+        Map<ItemStack, Integer> have = take(predicate, true, stack.stackSize);
+        if (have.values().stream().mapToInt(Integer::intValue).sum() < stack.stackSize) return false;
+        if (simulate) return true;
+        take(predicate, false, stack.stackSize);
+        return true;
+    }
+
+    /**
+     * Construct an IItemSource from inventories associated with given player.
+     * <p>
+     * This will be backed by {@link InventoryUtility}
+     */
+    static IItemSource fromPlayer(EntityPlayerMP player) {
+        return new IItemSource() {
+
+            @Nonnull
+            @Override
+            public Map<ItemStack, Integer> take(Predicate<ItemStack> p, boolean s, int c) {
+                return InventoryUtility.takeFromInventory(player, p, s, c);
+            }
+
+            @Override
+            public boolean takeOne(ItemStack stack, boolean simulate) {
+                if (stack == null || stack.getItem() == null || stack.stackSize != 1)
+                    throw new IllegalArgumentException();
+                return InventoryUtility.takeFromInventory(player, stack, simulate) == 1;
+            }
+
+            @Override
+            public boolean takeAll(ItemStack stack, boolean simulate) {
+                return InventoryUtility.takeFromInventory(player, stack, simulate) == stack.stackSize;
+            }
+        };
+    }
+
+    /**
+     * Construct an IItemSource from given inventory
+     * <p>
+     * This will be backed by {@link InventoryUtility}
+     */
+    static IItemSource fromInventory(IInventory inv) {
+        return (p, s, c) -> InventoryUtility.takeFromInventory(new InventoryIterable<>(inv), p, s, c, true);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/ISpecialItemBlock.java

@@ -0,0 +1,8 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import net.minecraft.block.Block;
+
+public interface ISpecialItemBlock {
+
+    int getItemMetaFromBlockMeta(Block block, int blockMeta);
+}

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureDefinition.java

@@ -1,175 +1,450 @@
 package com.gtnewhorizon.structurelib.structure;
 
-import com.gtnewhorizon.structurelib.StructureLib;
+import static com.gtnewhorizon.structurelib.structure.IStructureWalker.ignoreBlockUnloaded;
-import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import static com.gtnewhorizon.structurelib.structure.IStructureWalker.skipBlockUnloaded;
+
+import java.util.function.Function;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
 import net.minecraft.world.World;
 
-import java.util.Arrays;
+import com.gtnewhorizon.structurelib.StructureLib;
-
+import com.gtnewhorizon.structurelib.StructureLibAPI;
-import static com.gtnewhorizon.structurelib.StructureLib.DEBUG_MODE;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.alignment.constructable.ISurvivalConstructable;
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
 
+/**
+ * This is the structure definition of your multi. You will have one of these for each multi.
+ *
+ * <h2>Cache the instances of this class</h2>
+ * <p>
+ * You will construct this definition once per multi, either at class load or at first call to your variant of
+ * {@code getStructureDefinition()}. You can use a {@link ClassValue ClassValue&lt;IStructureDefinition&lt;?>>} if you
+ * have a template for subclass. You can also use {@link StructureUtility#defer(Function) defer()} or its overloads for
+ * simpler cases, but it is slightly less performant as it will allocate new objects on each structure check, whereas
+ * {@link ClassValue} will allocate once and cache it onwards.
+ * <p>
+ * <h2>Constructing</h2>
+ * <p>
+ * {@linkplain IStructureDefinition} is constructed using {@link IStructureDefinition#builder()}
+ * <p>
+ * Builder has two main methods:
+ * <ul>
+ * <li>{@link com.gtnewhorizon.structurelib.structure.StructureDefinition.Builder#addShape(String, String[][])
+ * addShape()} is a 2d string array describing the layout of structure. You can optionally use
+ * `StructureUtility#transpose()` to transpose the array to make the structure look nicer in source code.
+ * <li>{@link com.gtnewhorizon.structurelib.structure.StructureDefinition.Builder#addElement(Character, IStructureElement)
+ * addElement()}. It takes a char identifier (mapped to a char in any of
+ * {@link com.gtnewhorizon.structurelib.structure.StructureDefinition.Builder#addShape(String, String[][]) addShape()}
+ * calls) and a {@link IStructureElement}.
+ * </ul>
+ * <h2>Position A, B and C</h2>
+ *
+ * Imagine you stand in front of the controller, with controller facing towards you not rotated or flipped.
+ * <ul>
+ * <li>The "A" position would be the number of blocks on the left side of the controller, not counting controller
+ * itself.</li>
+ * <li>The "B" position would be the number of blocks on the top side of the controller, not counting controller
+ * itself.</li>
+ * <li>The "C" position would be the number of blocks between you and controller, not counting controller itself.</li>
+ * </ul>
+ *
+ * @param <T> Type of the context object. Usually this will be the multiblock controller.
+ */
 public interface IStructureDefinition<T> {
-	/**
-	 * Used internally
-	 *
-	 * Might, but is not required, to throw {@link java.util.NoSuchElementException} if the given structure piece is not found.
-	 *
-	 * @param name same name as for other methods here
-	 * @return the array of elements to process
-	 * @throws java.util.NoSuchElementException if the given structure piece is not found and the moon phase perfectly matches
-	 */
-	IStructureElement<T>[] getStructureFor(String name);
 
-	default boolean check(T object, String piece, World world, ExtendedFacing extendedFacing,
+    /**
-						  int basePositionX, int basePositionY, int basePositionZ,
+     * Used internally
-						  int basePositionA, int basePositionB, int basePositionC,
+     * <p>
-						  boolean forceCheckAllBlocks) {
+     * Might, but is not required, to throw {@link java.util.NoSuchElementException} if the given structure piece is not
-		return iterate(object, null, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
+     * found.
-				basePositionA, basePositionB, basePositionC, false, forceCheckAllBlocks);
+     *
-	}
+     * @param name same name as for other methods here
+     * @return the array of elements to process
+     * @throws java.util.NoSuchElementException if the given structure piece is not found and the moon phase perfectly
+     *                                          matches
+     */
+    IStructureElement<? super T>[] getStructureFor(String name);
 
-	default boolean hints(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+    boolean isContainedInStructure(String name, int offsetA, int offsetB, int offsetC);
-						  int basePositionX, int basePositionY, int basePositionZ,
-						  int basePositionA, int basePositionB, int basePositionC) {
-		return iterate(object, trigger, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
-				basePositionA, basePositionB, basePositionC, true, null);
-	}
 
-	default boolean build(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+    /**
-						  int basePositionX, int basePositionY, int basePositionZ,
+     * Run a structure check.
-						  int basePositionA, int basePositionB, int basePositionC) {
+     *
-		return iterate(object, trigger, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
+     * @param object              context object. usually multiblock controller.
-				basePositionA, basePositionB, basePositionC, false, null);
+     * @param piece               the structure piece's string identifier.
-	}
+     * @param world               the world object this check takes place in.
+     * @param extendedFacing      the current structure's orientation.
+     * @param basePositionX       X location of the structure
+     * @param basePositionY       Y location of the structure
+     * @param basePositionZ       Z location of the structure
+     * @param basePositionA       see class javadoc
+     * @param basePositionB       see class javadoc
+     * @param basePositionC       see class javadoc
+     * @param forceCheckAllBlocks check all location even if chunk not currently loaded.
+     * @return true if successful, false otherwise
+     */
+    default boolean check(T object, String piece, World world, ExtendedFacing extendedFacing, int basePositionX,
+            int basePositionY, int basePositionZ, int basePositionA, int basePositionB, int basePositionC,
+            boolean forceCheckAllBlocks) {
+        return iterate(
+                object,
+                null,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                false,
+                forceCheckAllBlocks);
+    }
 
-	default boolean buildOrHints(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+    /**
-								 int basePositionX, int basePositionY, int basePositionZ,
+     * Spawn hint particles. Should not be called on server side.
-								 int basePositionA, int basePositionB, int basePositionC,
+     *
-								 boolean hintsOnly) {
+     * @param object         context object. usually multiblock controller.
-		return iterate(object, trigger, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
+     * @param piece          the structure piece's string identifier.
-				basePositionA, basePositionB, basePositionC, hintsOnly, null);
+     * @param world          the world object this check takes place in.
-	}
+     * @param extendedFacing the current structure's orientation.
+     * @param basePositionX  X location of the structure
+     * @param basePositionY  Y location of the structure
+     * @param basePositionZ  Z location of the structure
+     * @param basePositionA  see class javadoc
+     * @param basePositionB  see class javadoc
+     * @param basePositionC  see class javadoc
+     * @return true if successful, false otherwise
+     */
+    default boolean hints(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+            int basePositionX, int basePositionY, int basePositionZ, int basePositionA, int basePositionB,
+            int basePositionC) {
+        return iterate(
+                object,
+                trigger,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                true,
+                null);
+    }
 
-	static <T> boolean iterate(T object, ItemStack trigger, IStructureElement<T>[] elements, World world, ExtendedFacing extendedFacing,
+    /**
-							   int basePositionX, int basePositionY, int basePositionZ,
+     * Build the multi in creative mode on a best-effort basis. Does not guarantee the structure is correct after a
-							   int basePositionA, int basePositionB, int basePositionC,
+     * successful call.
-							   boolean hintsOnly, Boolean checkBlocksIfNotNullForceCheckAllIfTrue) {
+     *
-		if (world.isRemote ^ hintsOnly) {
+     * @param object         context object. usually multiblock controller.
-			return false;
+     * @param trigger        The trigger item that contains channel data.
-		}
+     * @param piece          the structure piece's string identifier.
+     * @param world          the world object this check takes place in.
+     * @param extendedFacing the current structure's orientation.
+     * @param basePositionX  X location of the structure
+     * @param basePositionY  Y location of the structure
+     * @param basePositionZ  Z location of the structure
+     * @param basePositionA  see class javadoc
+     * @param basePositionB  see class javadoc
+     * @param basePositionC  see class javadoc
+     * @return true if sucessful, false otherwise
+     */
+    default boolean build(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+            int basePositionX, int basePositionY, int basePositionZ, int basePositionA, int basePositionB,
+            int basePositionC) {
+        return iterate(
+                object,
+                trigger,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                false,
+                null);
+    }
 
-		//change base position to base offset
+    /**
-		basePositionA = -basePositionA;
+     * Call {@link #build(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)} if
-		basePositionB = -basePositionB;
+     * {@code hintsOnly}, call
-		basePositionC = -basePositionC;
+     * {@link #hints(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)} otherwise.
+     *
+     * @param object         context object. usually multiblock controller.
+     * @param trigger        The trigger item that contains channel data.
+     * @param piece          the structure piece's string identifier.
+     * @param world          the world object this check takes place in.
+     * @param extendedFacing the current structure's orientation.
+     * @param basePositionX  X location of the structure
+     * @param basePositionY  Y location of the structure
+     * @param basePositionZ  Z location of the structure
+     * @param basePositionA  see class javadoc
+     * @param basePositionB  see class javadoc
+     * @param basePositionC  see class javadoc
+     * @param hintsOnly      whether to spawn hints or do creative build.
+     * @return true if sucessful, false otherwise
+     * @see #hints(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)
+     * @see #build(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)
+     */
+    default boolean buildOrHints(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+            int basePositionX, int basePositionY, int basePositionZ, int basePositionA, int basePositionB,
+            int basePositionC, boolean hintsOnly) {
+        return iterate(
+                object,
+                trigger,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                hintsOnly,
+                null);
+    }
 
-		int[] abc = new int[]{basePositionA, basePositionB, basePositionC};
+    /**
-		int[] xyz = new int[3];
+     * Cause a survival build.
+     *
+     * @param object         context object. usually multiblock controller.
+     * @param trigger        The trigger item that contains channel data.
+     * @param piece          the structure piece's string identifier.
+     * @param world          the world object this check takes place in.
+     * @param extendedFacing the current structure's orientation.
+     * @param basePositionX  X location of the structure
+     * @param basePositionY  Y location of the structure
+     * @param basePositionZ  Z location of the structure
+     * @param basePositionA  see class javadoc
+     * @param basePositionB  see class javadoc
+     * @param basePositionC  see class javadoc
+     * @param elementBudget  build up to this many elements
+     * @param source         from where to drain resource
+     * @param actor          source of action
+     * @param check          whether {@link IStructureElement#check(Object, World, int, int, int)} should be called if
+     *                       anything would be placed. use with caution. if in doubt, call
+     *                       {@link #check(Object, String, World, ExtendedFacing, int, int, int, int, int, int, boolean)}
+     *                       after this call and set this parameter to false
+     * @return number of elements built, or -1 if structure done
+     * @see #build(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)
+     */
+    @Deprecated
+    default int survivalBuild(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+            int basePositionX, int basePositionY, int basePositionZ, int basePositionA, int basePositionB,
+            int basePositionC, int elementBudget, IItemSource source, EntityPlayerMP actor, boolean check) {
+        EntityPlayer realActor;
+        if (actor == null) {
+            realActor = ISurvivalConstructable.__get_player();
+            if (realActor == null) throw new IllegalArgumentException();
+        } else {
+            realActor = actor;
+        }
+        return survivalBuild(
+                object,
+                trigger,
+                piece,
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                elementBudget,
+                ISurvivalBuildEnvironment.create(source, realActor),
+                check);
+    }
 
-		if (checkBlocksIfNotNullForceCheckAllIfTrue != null) {
+    /**
-			if (checkBlocksIfNotNullForceCheckAllIfTrue) {
+     * Cause a survival build.
-				for (IStructureElement<T> element : elements) {
+     *
-					if (element.isNavigating()) {
+     * @param object         context object. usually multiblock controller.
-						abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
+     * @param trigger        The trigger item that contains channel data.
-						abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
+     * @param piece          the structure piece's string identifier.
-						abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
+     * @param world          the world object this check takes place in.
-					} else {
+     * @param extendedFacing the current structure's orientation.
-						extendedFacing.getWorldOffset(abc, xyz);
+     * @param basePositionX  X location of the structure
-						xyz[0] += basePositionX;
+     * @param basePositionY  Y location of the structure
-						xyz[1] += basePositionY;
+     * @param basePositionZ  Z location of the structure
-						xyz[2] += basePositionZ;
+     * @param basePositionA  see class javadoc
+     * @param basePositionB  see class javadoc
+     * @param basePositionC  see class javadoc
+     * @param elementBudget  build up to this many elements
+     * @param env            build environment.
+     * @param check          whether {@link IStructureElement#check(Object, World, int, int, int)} should be called if
+     *                       anything would be placed. use with caution. if in doubt, call
+     *                       {@link IStructureDefinition#check(Object, String, World, ExtendedFacing, int, int, int, int, int, int, boolean)}
+     *                       after this call and set this parameter to false
+     * @return number of elements built, or -1 if structure done
+     * @see #build(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)
+     */
+    default int survivalBuild(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
+            int basePositionX, int basePositionY, int basePositionZ, int basePositionA, int basePositionB,
+            int basePositionC, int elementBudget, ISurvivalBuildEnvironment env, boolean check) {
+        SurvivalBuildStructureWalker<T> walker = new SurvivalBuildStructureWalker<>(
+                object,
+                trigger,
+                elementBudget,
+                env,
+                this,
+                piece,
+                extendedFacing,
+                new int[] { basePositionA, basePositionB, basePositionC },
+                check);
+        StructureUtility.iterateV2(
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                walker,
+                "survivalBuild");
+        return walker.getBuilt();
+    }
 
-						if (world.blockExists(xyz[0], xyz[1], xyz[2])) {
+    default void iterate(String piece, World world, ExtendedFacing extendedFacing, int basePositionX, int basePositionY,
-							if (!element.check(object, world, xyz[0], xyz[1], xyz[2])) {
+            int basePositionZ, int basePositionA, int basePositionB, int basePositionC, IStructureWalker<T> predicate) {
-								if (DEBUG_MODE) {
+        StructureUtility.iterateV2(
-									StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] failed @ " +
+                getStructureFor(piece),
-											Arrays.toString(xyz) + " " + Arrays.toString(abc));
+                world,
-								}
+                extendedFacing,
-								return false;
+                basePositionX,
-							}
+                basePositionY,
-						} else {
+                basePositionZ,
-							if (DEBUG_MODE) {
+                basePositionA,
-								StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] !blockExists @ " +
+                basePositionB,
-										Arrays.toString(xyz) + " " + Arrays.toString(abc));
+                basePositionC,
-							}
+                predicate,
-							return false;
+                "customIterate");
-						}
+    }
-						abc[0] += 1;
-					}
-				}
-			} else {
-				for (IStructureElement<T> element : elements) {
-					if (element.isNavigating()) {
-						abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
-						abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
-						abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
-					} else {
-						extendedFacing.getWorldOffset(abc, xyz);
-						xyz[0] += basePositionX;
-						xyz[1] += basePositionY;
-						xyz[2] += basePositionZ;
 
-						if (world.blockExists(xyz[0], xyz[1], xyz[2])) {
+    /**
-							if (!element.check(object, world, xyz[0], xyz[1], xyz[2])) {
+     * Low level utility.
-								if (DEBUG_MODE) {
+     *
-									StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] failed @ " +
+     * @param object                                  context object. usually multiblock controller.
-											Arrays.toString(xyz) + " " + Arrays.toString(abc));
+     * @param trigger                                 The trigger item that contains channel data.
-								}
+     * @param elements                                the structure piece
-								return false;
+     * @param world                                   the world object this check takes place in.
-							}
+     * @param extendedFacing                          the current structure's orientation.
-						} else {
+     * @param basePositionX                           X location of the structure
-							if (DEBUG_MODE) {
+     * @param basePositionY                           Y location of the structure
-								StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] !blockExists @ " +
+     * @param basePositionZ                           Z location of the structure
-										Arrays.toString(xyz) + " " + Arrays.toString(abc));
+     * @param basePositionA                           see class javadoc
-							}
+     * @param basePositionB                           see class javadoc
-						}
+     * @param basePositionC                           see class javadoc
-						abc[0] += 1;
+     * @param hintsOnly                               whether to spawn hints or do creative build. no effect if
-					}
+     *                                                {@code checkBlocksIfNotNullForceCheckAllIfTrue} is not null.
-				}
+     * @param checkBlocksIfNotNullForceCheckAllIfTrue creative build or spawn hints if null. Force check not loaded
-			}
+     *                                                chunk if true. Check only loaded chunk is false.
-		} else {
+     * @return true if iteration completed successfully.
-			if (hintsOnly) {
+     * @param <T> type of context object.
-				for (IStructureElement<T> element : elements) {
+     */
-					if (element.isNavigating()) {
+    static <T> boolean iterate(T object, ItemStack trigger, IStructureElement<? super T>[] elements, World world,
-						abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
+            ExtendedFacing extendedFacing, int basePositionX, int basePositionY, int basePositionZ, int basePositionA,
-						abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
+            int basePositionB, int basePositionC, boolean hintsOnly, Boolean checkBlocksIfNotNullForceCheckAllIfTrue) {
-						abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
+        if (!world.isRemote && hintsOnly) {
-					} else {
+            return false;
-						extendedFacing.getWorldOffset(abc, xyz);
+        }
-						xyz[0] += basePositionX;
-						xyz[1] += basePositionY;
-						xyz[2] += basePositionZ;
 
-						element.spawnHint(object, world, xyz[0], xyz[1], xyz[2], trigger);
+        if (checkBlocksIfNotNullForceCheckAllIfTrue != null) {
+            boolean success;
+            if (checkBlocksIfNotNullForceCheckAllIfTrue) {
+                success = StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        (e, w, x, y, z, a, b, c) -> e.check(object, w, x, y, z),
+                        "check");
+            } else {
+                success = StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        skipBlockUnloaded((e, w, x, y, z, a, b, c) -> e.check(object, w, x, y, z)),
+                        "check force");
+            }
+            if (StructureLibAPI.isDebugEnabled() && success) {
+                StructureLib.LOGGER
+                        .info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] pass");
+            }
+            return success;
+        } else {
+            if (hintsOnly) {
+                StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        ignoreBlockUnloaded((e, w, x, y, z, a, b, c) -> {
+                            e.spawnHint(object, world, x, y, z, trigger);
+                            if (ChannelDataAccessor.hasSubChannel(trigger, StructureLibAPI.CHANNEL_SHOW_ERROR)
+                                    && !e.couldBeValid(object, world, x, y, z, trigger)) {
+                                StructureLibAPI.markHintParticleError(StructureLib.getCurrentPlayer(), world, x, y, z);
+                            }
+                            return true;
+                        }),
+                        "spawnHint");
+            } else {
+                StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        ignoreBlockUnloaded((e, w, x, y, z, a, b, c) -> {
+                            e.placeBlock(object, world, x, y, z, trigger);
+                            return true;
+                        }),
+                        "placeBlock");
+            }
+        }
+        return true;
+    }
 
-						abc[0] += 1;
+    /**
-					}
+     * Create a new instance of builder.
-				}
+     *
-			} else {
+     * @param <T> type of context object
-				for (IStructureElement<T> element : elements) {
+     */
-					if (element.isNavigating()) {
+    static <T> StructureDefinition.Builder<T> builder() {
-						abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
+        return StructureDefinition.builder();
-						abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
+    }
-						abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
-					} else {
-						extendedFacing.getWorldOffset(abc, xyz);
-						xyz[0] += basePositionX;
-						xyz[1] += basePositionY;
-						xyz[2] += basePositionZ;
-
-						if (world.blockExists(xyz[0], xyz[1], xyz[2])) {
-							element.placeBlock(object, world, xyz[0], xyz[1], xyz[2], trigger);
-						}
-						abc[0] += 1;
-					}
-				}
-			}
-		}
-		return true;
-	}
-
-	static <T> StructureDefinition.Builder<T> builder() {
-		return StructureDefinition.builder();
-	}
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElement.java

@@ -1,43 +1,384 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
+import static com.gtnewhorizon.structurelib.StructureLib.PANIC_MODE;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import net.minecraft.block.Block;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
+
 /**
- * Use StructureUtility to instantiate
+ * Use StructureUtility to instantiate. These are the building blocks for your {@link IStructureDefinition}. It
+ * represents what a particular element can be and how this particular element should be autoplaced.
+ *
+ * @param <T> Type of the context object. {@link IStructureElement} is contravariant over T, so parameters and fields of
+ *            type {@link IStructureElement} should be declared as {@code IStructureElement<? super T>}
  */
 public interface IStructureElement<T> {
-	boolean check(T t, World world, int x, int y, int z);
 
-	boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger);
+    boolean check(T t, World world, int x, int y, int z);
 
-	boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger);
+    /**
+     * Pure (stateless and side effect free) function to test if current block could be valid. Used to give user hints
+     * about incorrectly placed blocks given a controller and trigger item. If couldBeValid(...) == false for a set of
+     * channels, with those same tiers, check(...) == false. Not required, defaults to true which is always safe but
+     * won't give the user error hints.
+     */
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return true;
+    }
 
-	default int getStepA() {
+    /**
-		return 1;
+     * Returns a human-readable description of what block(s) this element accepts. Used for diagnostic messages when
-	}
+     * structure checks fail (e.g. "expected Input Bus at (1, 2, 3)").
+     * <p>
+     * Unlike {@link #getBlocksToPlace}, which returns the full set of concrete block variants for autoplacing (e.g.
+     * every tier of Input Bus), this method returns <b>category-level</b> descriptions suitable for display to the
+     * player (e.g. just "Input Bus"). It also requires no parameters, no world, trigger item, or environment, making it
+     * usable in contexts where those are unavailable.
+     * <p>
+     * Implementations should return <b>lang keys</b> (e.g. {@code "tile.blockGlass.name"}) rather than pre-translated
+     * display names. The caller is responsible for translating these keys on the client side via
+     * {@code StatCollector.translateToLocal()}. If a key has no matching translation, {@code translateToLocal} returns
+     * the input string unchanged, so pre-translated fallback strings also work.
+     *
+     * @param context the context object (e.g. the multiblock controller), used to determine state-dependent
+     *                descriptions
+     * @return a list of accepted block descriptions as lang keys (or display names as fallback), or null if no
+     *         description is available
+     */
+    @Nullable
+    default List<String> getDescription(T context) {
+        return null;
+    }
 
-	default int getStepB() {
+    boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger);
-		return 0;
-	}
 
-	default int getStepC() {
+    boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger);
-		return 0;
-	}
 
-	default boolean resetA() {
+    /**
-		return false;
+     * Try place the block by taking resource from given IItemSource.
-	}
+     * <p>
+     * You might want to use
+     * {@link StructureUtility#survivalPlaceBlock(Block, int, World, int, int, int, IItemSource, net.minecraft.entity.player.EntityPlayer)}
+     * or its overloads to implement this.
+     *
+     * @param trigger trigger item
+     * @param s       drain resources from this place
+     * @param actor   source of action. for very critical errors you can also just send the error messages here,
+     *                bypassing any filter that chatter might have.
+     * @param chatter send error messages here. Caller will choose an appropriate way to forward it to player if the
+     *                other fallbacks also fails.
+     * @deprecated caller should call the non deprecated overload. implementor for reusable {@link IStructureElement}
+     *             should still implement this. implementor for private implementations can freely ignore this as long
+     *             as you know the caller will not call this overload.
+     */
+    @Deprecated
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
+            EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
+        if (PANIC_MODE) throw new RuntimeException("Panic Tripwire hit");
+        if (StructureLibAPI.isDebugEnabled()) LOGGER.error(
+                "Default implementation of survivalPlaceBlock hit! Things aren't going to work well! IStructureElement class: {}",
+                getClass().getName());
+        if (!StructureLibAPI.isBlockTriviallyReplaceable(world, x, y, z, actor)) return PlaceResult.REJECT;
+        return PlaceResult.REJECT_CONTINUE;
+    }
 
-	default boolean resetB() {
+    /**
-		return false;
+     * A simplified version of survivalPlaceBlock. Return null if not implemented.
-	}
+     * <p>
+     * <b>BY OVERRIDING THIS TO NULL, YOU ACKNOWLEDGE THAT THE {@link #check(Object, World, int, int, int)} OF THIS
+     * CLASS IS SIDE EFFECT FREE AND CAN HAVE ITS CHECK CALLED WITHOUT BREAKING ANYTHING. OTHERWISE OVERRIDE THE
+     * {@link #survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)} TO PROVIDE A
+     * SIDEEFFECT FREE {@link PlaceResult#SKIP}.</b>
+     * <p>
+     * It should be noticed that this filter is only advisory and the actual
+     * {@link #survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)} or
+     * {@link #check(Object, World, int, int, int)} are free to reject/accept/place blocks not contained in this list,
+     * e.g. when the element can be placed anywhere in the structure, but no more than 3 overall; when the structure
+     * element cannot know all blocks it will accept at the time of calling; when this is backed by a legacy
+     * {@link IStructureElement} that just didn't implement this API.
+     *
+     * @param trigger trigger item
+     * @param env     autoplacing environment
+     * @return null if not implemented, otherwise an instance describing what kind of blocks will be placed by
+     *         {@link #survivalPlaceBlock(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)}
+     */
+    @Nullable
+    default BlocksToPlace getBlocksToPlace(T t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        return null;
+    }
 
-	default boolean resetC() {
+    /**
-		return false;
+     * Try place the block by taking resource from given {@link IItemSource}.
-	}
+     * <p>
+     * You might want to use
+     * {@link StructureUtility#survivalPlaceBlock(Block, int, World, int, int, int, IItemSource, net.minecraft.entity.player.EntityPlayer)}
+     * or its overloads to implement this.
+     * <p>
+     * The default implementation provided will
+     * <ol>
+     * <li>Get {@link BlocksToPlace} via
+     * {@link #getBlocksToPlace(Object, World, int, int, int, ItemStack, AutoPlaceEnvironment)}. If not null
+     * <ol>
+     * <li>call {@link #check(Object, World, int, int, int)}. If this returns {@code true}, {@link PlaceResult#SKIP}
+     * will be returned without further action.</li>
+     * <li>Use the {@link BlocksToPlace} retrieved earlier and passed in {@link IItemSource} to determine an item to
+     * place</li>
+     * <li>Hand over control to
+     * {@link StructureUtility#survivalPlaceBlock(ItemStack, NBTMode, NBTTagCompound, boolean, World, int, int, int, IItemSource, EntityPlayer, Consumer)}</li>
+     * </ol>
+     * </li>
+     * <li>Call legacy
+     * {@link #survivalPlaceBlock(Object, World, int, int, int, ItemStack, IItemSource, EntityPlayerMP, Consumer)} if
+     * {@code env.getActor()} contains an {@link EntityPlayerMP}</li>
+     * <li>Emit warning under debug mode (or throw exception under panic mode), then return
+     * {@link PlaceResult#SKIP}</li>
+     * </ol>
+     * It should be noticed that the default implementation is likely to cause unexpected issues if the
+     * {@link #check(Object, World, int, int, int)} is not side effect free, or is not idempotent. E.g. the
+     * {@link #check(Object, World, int, int, int)} will add current coord to a {@link java.util.List}. As this method
+     * might be invoked at a location that is already accepted, this will cause the machine to have multiple of this
+     * coord in its list.
+     *
+     * @param trigger trigger item
+     * @param env     autoplacing environment
+     */
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        BlocksToPlace e = getBlocksToPlace(t, world, x, y, z, trigger, env);
+        IItemSource source = env.getSource();
+        EntityPlayer actor = env.getActor();
+        Consumer<IChatComponent> chatter = env.getChatter();
+        if (e != null) {
+            if (check(t, world, x, y, z)) return PlaceResult.SKIP;
+            if (e.getStacks() == null) {
+                ItemStack taken = source.takeOne(e.getPredicate(), true);
+                return StructureUtility.survivalPlaceBlock(
+                        taken,
+                        NBTMode.EXACT,
+                        taken.stackTagCompound,
+                        true,
+                        world,
+                        x,
+                        y,
+                        z,
+                        source,
+                        actor,
+                        chatter);
+            }
+            for (ItemStack stack : e.getStacks()) {
+                if (!source.takeOne(stack, true)) continue;
+                return StructureUtility.survivalPlaceBlock(
+                        stack,
+                        NBTMode.EXACT,
+                        stack.stackTagCompound,
+                        true,
+                        world,
+                        x,
+                        y,
+                        z,
+                        source,
+                        actor,
+                        chatter);
+            }
+            return PlaceResult.REJECT;
+        }
+        if (actor instanceof EntityPlayerMP)
+            return survivalPlaceBlock(t, world, x, y, z, trigger, source, (EntityPlayerMP) actor, chatter);
+        if (PANIC_MODE) throw new RuntimeException("Panic Tripwire hit");
+        if (StructureLibAPI.isDebugEnabled()) LOGGER.info(
+                "Fallback shim code of survivalPlaceBlock hit! Things aren't going to work well! IStructureElement class: {}",
+                getClass().getName());
+        return PlaceResult.REJECT_CONTINUE;
+    }
 
-	default boolean isNavigating() {
+    /**
-		return false;
+     * Forget the messed up class dependency graph for now. this is just so convenient.
-	}
+     */
+    default IStructureElementNoPlacement<T> noPlacement() {
+        return new IStructureElementNoPlacement<>() {
+
+            @Override
+            public boolean check(T t, World world, int x, int y, int z) {
+                return IStructureElement.this.check(t, world, x, y, z);
+            }
+
+            @Override
+            public boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+                return IStructureElement.this.couldBeValid(t, world, x, y, z, trigger);
+            }
+
+            @Override
+            public boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+                return IStructureElement.this.spawnHint(t, world, x, y, z, trigger);
+            }
+
+            @Nullable
+            @Override
+            public List<String> getDescription(T context) {
+                return IStructureElement.this.getDescription(context);
+            }
+        };
+    }
+
+    default int getStepA() {
+        return 1;
+    }
+
+    default int getStepB() {
+        return 0;
+    }
+
+    default int getStepC() {
+        return 0;
+    }
+
+    default boolean resetA() {
+        return false;
+    }
+
+    default boolean resetB() {
+        return false;
+    }
+
+    default boolean resetC() {
+        return false;
+    }
+
+    default boolean isNavigating() {
+        return false;
+    }
+
+    enum PlaceResult {
+        /**
+         * The element's check passed, the position is already valid. No placement is needed. In the walker: continue
+         * iteration (no error, not counted as placed). In ofChain: short-circuits, remaining alternatives are skipped.
+         */
+        SKIP,
+        /**
+         * The element cannot handle this position (occupied, missing resources, etc.). In the walker: stop iteration
+         * with error particles. In ofChain: try next alternative.
+         */
+        REJECT,
+        /**
+         * This element has no survivalPlaceBlock implementation (default fallback), or otherwise cannot place but is
+         * not an error condition. In the walker: continue iteration silently (like SKIP). In ofChain: try next
+         * alternative (like REJECT), so a better-suited element can handle it.
+         */
+        REJECT_CONTINUE,
+        /**
+         * Autoplace cannot proceed within this tick. To proceed further would require stopping the placement and wait
+         * for next round.
+         */
+        STOP,
+        /**
+         * Element placed successfully.
+         */
+        ACCEPT,
+        /**
+         * Combination of ACCEPT and STOP.
+         * <p>
+         * Element placed successfully. To proceed further would require stopping the placement and wait for next round.
+         */
+        ACCEPT_STOP;
+    }
+
+    final class BlocksToPlace {
+
+        public static final BlocksToPlace errored = createEmpty();
+        private final Predicate<ItemStack> predicate;
+        private final Iterable<ItemStack> stacks;
+
+        public static BlocksToPlace createEmpty() {
+            return new BlocksToPlace(s -> false, Collections.emptyList());
+        }
+
+        public static BlocksToPlace create(ItemStack... stacks) {
+            return create(Arrays.asList(stacks));
+        }
+
+        public static BlocksToPlace create(Iterable<ItemStack> stacks) {
+            Predicate<ItemStack> predicate = null;
+
+            for (ItemStack stack : stacks) {
+                ItemStackPredicate p = ItemStackPredicate.from(stack, NBTMode.EXACT);
+                if (predicate == null) predicate = p;
+                else predicate = predicate.or(p);
+            }
+
+            return new BlocksToPlace(predicate, stacks);
+        }
+
+        public static BlocksToPlace create(Block block, int meta) {
+            Item itemBlock = Item.getItemFromBlock(block);
+            if (itemBlock instanceof ISpecialItemBlock) {
+                meta = ((ISpecialItemBlock) itemBlock).getItemMetaFromBlockMeta(block, meta);
+            }
+            return create(itemBlock, meta);
+        }
+
+        public static BlocksToPlace create(Item item, int meta) {
+            return new BlocksToPlace(
+                    ItemStackPredicate.from(item).setMeta(meta),
+                    Collections.singletonList(new ItemStack(item, 1, meta)));
+        }
+
+        public static BlocksToPlace create(ItemStack itemStack) {
+            return new BlocksToPlace(ItemStackPredicate.from(itemStack), Collections.singletonList(itemStack));
+        }
+
+        public static BlocksToPlace create(Predicate<ItemStack> predicate) {
+            return new BlocksToPlace(predicate, null);
+        }
+
+        BlocksToPlace(Predicate<ItemStack> predicate, Iterable<ItemStack> stacks) {
+            this.predicate = predicate;
+            this.stacks = stacks;
+        }
+
+        /**
+         * Get the blocks to place filter. This is usually slower as it requires walking through inventories one by one.
+         * <p>
+         * Suitable for use with {@link IItemSource#takeOne(Predicate, boolean)}
+         *
+         * @return a predicate. never null.
+         */
+        @Nonnull
+        public Predicate<ItemStack> getPredicate() {
+            return predicate;
+        }
+
+        /**
+         * Get the ItemStacks that this one is known to accept. Can be null if this info is not available at the time
+         * this instance is constructed.
+         * <p>
+         * Suitable for use with {@link IItemSource#takeOne(ItemStack, boolean)}.
+         * <p>
+         * This should be equivalent to the predicate returned from {@link #getPredicate()}
+         */
+        @Nullable
+        public Iterable<ItemStack> getStacks() {
+            return stacks;
+        }
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementChain.java

@@ -1,41 +1,147 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
+import com.google.common.collect.Iterables;
+
 /**
  * Use StructureUtility to instantiate
  */
 public interface IStructureElementChain<T> extends IStructureElement<T> {
-	IStructureElement<T>[] fallbacks();
 
-	@Override
+    IStructureElement<? super T>[] fallbacks();
-	default boolean check(T t, World world, int x, int y, int z) {
-		for (IStructureElement<T> fallback : fallbacks()) {
-			if (fallback.check(t, world, x, y, z)) {
-				return true;
-			}
-		}
-		return false;
-	}
 
-	@Override
+    @Override
-	default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean check(T t, World world, int x, int y, int z) {
-		for (IStructureElement<T> fallback : fallbacks()) {
+        for (IStructureElement<? super T> fallback : fallbacks()) {
-			if (fallback.spawnHint(t, world, x, y, z, trigger)) {
+            if (fallback.check(t, world, x, y, z)) {
-				return true;
+                return true;
-			}
+            }
-		}
+        }
-		return false;
+        return false;
-	}
+    }
 
-	@Override
+    @Override
-	default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
-		for (IStructureElement<T> fallback : fallbacks()) {
+        for (IStructureElement<? super T> fallback : fallbacks()) {
-			if (fallback.placeBlock(t, world, x, y, z, trigger)) {
+            if (fallback.couldBeValid(t, world, x, y, z, trigger)) {
-				return true;
+                return true;
-			}
+            }
-		}
+        }
-		return false;
+        return false;
-	}
+    }
+
+    @Override
+    default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+        for (IStructureElement<? super T> fallback : fallbacks()) {
+            if (fallback.spawnHint(t, world, x, y, z, trigger)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+        for (IStructureElement<? super T> fallback : fallbacks()) {
+            if (fallback.placeBlock(t, world, x, y, z, trigger)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Nullable
+    @Override
+    default List<String> getDescription(T context) {
+        Set<String> descriptions = new LinkedHashSet<>();
+        for (IStructureElement<? super T> fallback : fallbacks()) {
+            List<String> desc = fallback.getDescription(context);
+            if (desc != null) {
+                descriptions.addAll(desc);
+            }
+        }
+        return descriptions.isEmpty() ? null : new ArrayList<>(descriptions);
+    }
+
+    @Nullable
+    @Override
+    default BlocksToPlace getBlocksToPlace(T t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        Predicate<ItemStack> predicate = null;
+        List<Iterable<ItemStack>> is = new ArrayList<>();
+        for (IStructureElement<? super T> fallback : fallbacks()) {
+            BlocksToPlace e = fallback.getBlocksToPlace(t, world, x, y, z, trigger, env);
+            if (e == null) continue;
+            if (predicate == null) predicate = e.getPredicate();
+            else predicate = predicate.or(e.getPredicate());
+            Iterable<ItemStack> stacks = e.getStacks();
+            if (stacks != null) is.add(stacks);
+        }
+        if (predicate == null) return null;
+        return new BlocksToPlace(predicate, Iterables.concat(is));
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
+            EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
+        boolean allContinue = true;
+        List<IChatComponent> bufferedNoise = new ArrayList<>();
+        for (IStructureElement<? super T> fallback : fallbacks()) {
+            PlaceResult result = fallback.survivalPlaceBlock(t, world, x, y, z, trigger, s, actor, bufferedNoise::add);
+            switch (result) {
+                case REJECT_CONTINUE:
+                    break;
+                case REJECT:
+                    allContinue = false;
+                    break;
+                case SKIP:
+                    bufferedNoise.forEach(chatter);
+                    return PlaceResult.SKIP;
+                default:
+                    return result;
+            }
+        }
+        // dump all that noise back into upstream
+        bufferedNoise.forEach(chatter);
+        return allContinue ? PlaceResult.REJECT_CONTINUE : PlaceResult.REJECT;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        boolean allContinue = true;
+        List<IChatComponent> bufferedNoise = new ArrayList<>();
+        for (IStructureElement<? super T> fallback : fallbacks()) {
+            PlaceResult result = fallback
+                    .survivalPlaceBlock(t, world, x, y, z, trigger, env.withChatter(bufferedNoise::add));
+            switch (result) {
+                case REJECT_CONTINUE:
+                    break;
+                case REJECT:
+                    allContinue = false;
+                    break;
+                case SKIP:
+                    bufferedNoise.forEach(env.getChatter());
+                    return PlaceResult.SKIP;
+                default:
+                    return result;
+            }
+        }
+        // dump all that noise back into upstream
+        bufferedNoise.forEach(env.getChatter());
+        return allContinue ? PlaceResult.REJECT_CONTINUE : PlaceResult.REJECT;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementCheckOnly.java

@@ -1,16 +1,38 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.function.Consumer;
+
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 public interface IStructureElementCheckOnly<T> extends IStructureElement<T> {
-	@Override
-	default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
-		return false;
-	}
 
-	@Override
+    @Override
-	default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
-		return false;
+        return false;
-	}
+    }
+
+    @Override
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return true;
+    }
+
+    @Override
+    default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return false;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
+            EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
+        return PlaceResult.REJECT_CONTINUE;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        return PlaceResult.REJECT_CONTINUE;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementNoPlacement.java

@@ -1,11 +1,33 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.function.Consumer;
+
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 public interface IStructureElementNoPlacement<T> extends IStructureElement<T> {
-	@Override
+
-	default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+    @Override
-		return false;
+    default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
-	}
+        return false;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
+            EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
+        return PlaceResult.REJECT;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        return PlaceResult.REJECT;
+    }
+
+    @Override
+    default IStructureElementNoPlacement<T> noPlacement() {
+        return this;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureNavigate.java

@@ -1,28 +1,50 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.function.Consumer;
+
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 /**
  * Use StructureUtility to instantiate
  */
-interface IStructureNavigate<T> extends IStructureElement<T> {
+interface IStructureNavigate extends IStructureElement<Object> {
-	@Override
-	default boolean check(T t, World world, int x, int y, int z) {
-		return true;
-	}
 
-	@Override
+    @Override
-	default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean check(Object t, World world, int x, int y, int z) {
-		return true;
+        return true;
-	}
+    }
 
-	@Override
+    @Override
-	default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean couldBeValid(Object t, World world, int x, int y, int z, ItemStack trigger) {
-		return true;
+        return true;
-	}
+    }
 
-	default boolean isNavigating() {
+    @Override
-		return true;
+    default boolean spawnHint(Object t, World world, int x, int y, int z, ItemStack trigger) {
-	}
+        return true;
+    }
+
+    @Override
+    default boolean placeBlock(Object t, World world, int x, int y, int z, ItemStack trigger) {
+        return true;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(Object t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
+            EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
+        return PlaceResult.SKIP;
+    }
+
+    @Override
+    default PlaceResult survivalPlaceBlock(Object t, World world, int x, int y, int z, ItemStack trigger,
+            AutoPlaceEnvironment env) {
+        return PlaceResult.SKIP;
+    }
+
+    default boolean isNavigating() {
+        return true;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureWalker.java

@@ -0,0 +1,64 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import net.minecraft.world.World;
+
+/**
+ * A functional interface that is used to iterate over an arbitrary structure.
+ */
+@FunctionalInterface
+public interface IStructureWalker<T> {
+
+    /**
+     * Called once per structure element.
+     *
+     * @param element The current element
+     * @param world   The current world
+     * @param x       The absolute X position of the element in world coordinates
+     * @param y       The absolute Y position of the element in world coordinates
+     * @param z       The absolute Z position of the element in world coordinates
+     * @param a       The relative A position of the element in structure-local coordinates (pre transform)
+     * @param b       The relative B position of the element in structure-local coordinates (pre transform)
+     * @param c       The relative C position of the element in structure-local coordinates (pre transform)
+     * @return False to stop iterating, true to continue.
+     */
+    boolean visit(IStructureElement<? super T> element, World world, int x, int y, int z, int a, int b, int c);
+
+    default boolean blockNotLoaded(IStructureElement<? super T> element, World world, int x, int y, int z, int a, int b,
+            int c) {
+        return false;
+    }
+
+    static <T> IStructureWalker<T> ignoreBlockUnloaded(IStructureWalker<T> walker) {
+        return new IStructureWalker<>() {
+
+            @Override
+            public boolean visit(IStructureElement<? super T> element, World world, int x, int y, int z, int a, int b,
+                    int c) {
+                return walker.visit(element, world, x, y, z, a, b, c);
+            }
+
+            @Override
+            public boolean blockNotLoaded(IStructureElement<? super T> element, World world, int x, int y, int z, int a,
+                    int b, int c) {
+                return walker.visit(element, world, x, y, z, a, b, c);
+            }
+        };
+    }
+
+    static <T> IStructureWalker<T> skipBlockUnloaded(IStructureWalker<T> walker) {
+        return new IStructureWalker<>() {
+
+            @Override
+            public boolean visit(IStructureElement<? super T> element, World world, int x, int y, int z, int a, int b,
+                    int c) {
+                return walker.visit(element, world, x, y, z, a, b, c);
+            }
+
+            @Override
+            public boolean blockNotLoaded(IStructureElement<? super T> element, World world, int x, int y, int z, int a,
+                    int b, int c) {
+                return true;
+            }
+        };
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/ISurvivalBuildEnvironment.java

@@ -0,0 +1,41 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+
+import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+
+/*
+ * Architecture notes: this should never get any callback from survival build. All structure significant code belongs
+ * within the IStructureElement. This will make the user easier to maintain the IStructureDefinition. Structure Element
+ * knows the most about what this structure element should do, not the caller.
+ */
+public interface ISurvivalBuildEnvironment {
+
+    /**
+     * Get the source of the items. This will be invoked exactly once per structure element build.
+     * <p>
+     * If the call chain ever got into the old API, this will be called at least once per
+     * {@link IStructureDefinition#survivalBuild(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int, int, ISurvivalBuildEnvironment, boolean)}
+     * call.
+     */
+    IItemSource getSource();
+
+    /**
+     * Get the origin of action. This will be invoked at least once per
+     * {@link IStructureDefinition#survivalBuild(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int, int, ISurvivalBuildEnvironment, boolean)}
+     * call.
+     */
+    EntityPlayer getActor();
+
+    /**
+     * Create a default implementation with three parameters all being constants.
+     *
+     * @param source from where to drain resource
+     * @param actor  source of action
+     */
+    static ISurvivalBuildEnvironment create(IItemSource source, EntityPlayer actor) {
+        return new DefaultSurvivalBuildEnvironment(source, actor);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/ITierConverter.java

@@ -4,9 +4,11 @@ import net.minecraft.block.Block;
 
 /**
  * a function to extract tier info from a block.
+ *
  * @param <TIER>
  */
 @FunctionalInterface
 public interface ITierConverter<TIER> {
+
     TIER convert(Block block, int meta);
 }