Delete duplicate copy of class

dependencies.gradle

@@ -3,6 +3,7 @@
 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')

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

@@ -1,88 +0,0 @@
-package com.gtnewhorizon.structurelib;
-
-import java.util.Collection;
-import java.util.Map;
-
-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.ItemStack;
-import net.minecraft.util.ChatComponentTranslation;
-import net.minecraft.util.MovingObjectPosition;
-import net.minecraft.world.World;
-
-import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
-import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
-
-/**
- * Handler for middle-click channel picking. When the player holds a hologram projector on the cursor and middle-clicks
- * a registered indicator item, the corresponding channel is set on the projector. The same applies in world when the
- * projector is held in hand and a registered indicator block is middle-clicked. Shift+middle-click wipes all channels.
- * Was made side neutral to support server-side validation at some point if necessary.
- */
-public final class ChannelPickHandler {
-
-    private ChannelPickHandler() {}
-
-    /**
-     * Handle a middle-click event while holding a hologram projector on the cursor.
-     */
-    public static boolean handleMiddleClick(EntityPlayer player, ItemStack holoStack, @Nullable ItemStack targetStack,
-            final boolean isSneaking) {
-        return handlePick(player, holoStack, targetStack, isSneaking, true);
-    }
-
-    public static boolean handleWorldPick(World world, EntityPlayer player, ItemStack holoStack,
-            @Nullable MovingObjectPosition hit, final boolean isSneaking) {
-        ItemStack targetStack = null;
-
-        if (hit != null) {
-            Block block = world.getBlock(hit.blockX, hit.blockY, hit.blockZ);
-            if (!block.isAir(world, hit.blockX, hit.blockY, hit.blockZ)) {
-                targetStack = block.getPickBlock(hit, world, hit.blockX, hit.blockY, hit.blockZ, player);
-            }
-        }
-
-        // A null target still goes through so that shift+middle-click wipes even when aiming at nothing
-        return handlePick(player, holoStack, targetStack, isSneaking, false);
-    }
-
-    private static boolean handlePick(EntityPlayer player, ItemStack holoStack, @Nullable ItemStack targetStack,
-            final boolean isSneaking, final boolean onCursor) {
-        // Clear channels on shift+middle-click. The "press again to confirm" gesture is gated client-side
-        // (see ChannelWipeConfirmation) before this method is ever called.
-        if (isSneaking) {
-            ChannelDataAccessor.wipeChannelData(holoStack);
-            sendChannelData(player, holoStack, onCursor);
-            player.addChatMessage(new ChatComponentTranslation("structurelib.pickchannel.cleared"));
-            return true;
-        }
-
-        if (targetStack == null) return false; // nothing hovered, cancel silently
-
-        Collection<Map.Entry<String, Integer>> channels = ChannelDescription.iterate(targetStack);
-        if (channels.isEmpty()) {
-            player.addChatMessage(new ChatComponentTranslation("structurelib.pickchannel.nomapping"));
-            return false;
-        }
-
-        // Assuming there's only 1 channel per item for now (same behavior as drag and drop)
-        Map.Entry<String, Integer> first = channels.iterator().next();
-        ChannelDataAccessor.setChannelData(holoStack, first.getKey(), first.getValue());
-        sendChannelData(player, holoStack, onCursor);
-        player.addChatMessage(
-                new ChatComponentTranslation("structurelib.pickchannel.success", first.getKey(), first.getValue()));
-        return true;
-    }
-
-    /**
-     * Player is the one triggering this update, so should already be in-sync.
-     */
-    private static void sendChannelData(EntityPlayer player, ItemStack holoStack, boolean onCursor) {
-        if (!(player instanceof EntityPlayerMP)) {
-            StructureLib.net.sendToServer(new SetChannelDataMessage(holoStack, onCursor));
-        }
-    }
-}

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

@@ -1,33 +0,0 @@
-package com.gtnewhorizon.structurelib;
-
-import net.minecraft.client.Minecraft;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.util.ChatComponentTranslation;
-
-/**
- * Client-side-only confirmation gate for "wipe all channels" shift+middle-click gesture.
- */
-public final class ChannelWipeConfirmation {
-
-    private static final long CONFIRM_WINDOW_MS = 5000;
-    private static long armedAtMs = -1;
-
-    private ChannelWipeConfirmation() {}
-
-    /**
-     * Call this before invoking {@link ChannelPickHandler} whenever the wipe gesture (shift+middle-click) is detected.
-     *
-     * @return true if this is a confirming second press within the window and the wipe should proceed now; false if
-     *         this press only armed the confirmation.
-     */
-    public static boolean confirm(EntityPlayer player) {
-        long now = Minecraft.getSystemTime();
-        if (now - armedAtMs > CONFIRM_WINDOW_MS) {
-            armedAtMs = now;
-            player.addChatMessage(new ChatComponentTranslation("structurelib.pickchannel.confirmwipe"));
-            return false;
-        }
-        armedAtMs = -1;
-        return true;
-    }
-}

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

@@ -30,7 +30,6 @@ 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.MouseEvent;
 import net.minecraftforge.client.event.RenderWorldLastEvent;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.common.config.ConfigElement;
@@ -41,7 +40,6 @@ import org.apache.commons.lang3.tuple.Pair;
 import org.lwjgl.opengl.GL11;
 
 import com.gtnewhorizon.structurelib.entity.fx.WeightlessParticleFX;
-import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
 import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
 import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
 
@@ -55,8 +53,6 @@ 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;
-import cpw.mods.fml.relauncher.Side;
-import cpw.mods.fml.relauncher.SideOnly;
 
 public class ClientProxy extends CommonProxy {
 
@@ -564,35 +560,6 @@ public class ClientProxy extends CommonProxy {
 
     public static class ForgeEventHandler {
 
-        @SubscribeEvent
-        @SideOnly(Side.CLIENT)
-        public void onMouseEvent(MouseEvent event) {
-            final EntityPlayer player = Minecraft.getMinecraft().thePlayer;
-
-            if (player == null || player.isDead) {
-                return;
-            }
-
-            final ItemStack heldItem = player.getHeldItem();
-
-            if (heldItem == null || !(heldItem.getItem() instanceof ItemConstructableTrigger)) return;
-
-            if (event.button != 2 || !event.buttonstate) return;
-
-            // Sink the middle click as soon as a projector is held, so vanilla pick block does not run
-            event.setCanceled(true);
-
-            final boolean isSneaking = player.isSneaking();
-            if (isSneaking && !ChannelWipeConfirmation.confirm(player)) return;
-
-            ChannelPickHandler.handleWorldPick(
-                    player.worldObj,
-                    player,
-                    heldItem,
-                    Minecraft.getMinecraft().objectMouseOver,
-                    isSneaking);
-        }
-
         @SubscribeEvent
         public void onEntityJoinWorld(EntityJoinWorldEvent e) {
             if (e.world.isRemote && e.entity instanceof EntityClientPlayerMP) {

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

@@ -17,7 +17,6 @@ import net.minecraftforge.common.MinecraftForge;
 import com.gtnewhorizon.structurelib.net.ErrorHintParticleMessage;
 import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
 
-import cpw.mods.fml.common.event.FMLInitializationEvent;
 import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
@@ -65,8 +64,6 @@ public class CommonProxy {
 
     public void preInit(FMLPreInitializationEvent e) {}
 
-    public void init(FMLInitializationEvent e) {}
-
     public long getOverworldTime() {
         return MinecraftServer.getServer().getEntityWorld().getTotalWorldTime();
     }

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

@@ -33,7 +33,6 @@ import com.gtnewhorizon.structurelib.util.XSTR;
 
 import cpw.mods.fml.common.Mod;
 import cpw.mods.fml.common.SidedProxy;
-import cpw.mods.fml.common.event.FMLInitializationEvent;
 import cpw.mods.fml.common.event.FMLInterModComms;
 import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
@@ -129,11 +128,6 @@ public class StructureLib {
         DevelopHelper.onPreInit();
     }
 
-    @Mod.EventHandler
-    public void init(FMLInitializationEvent e) {
-        proxy.init(e);
-    }
-
     @Mod.EventHandler
     public void loadComplete(FMLLoadCompleteEvent e) {
         proxy.loadComplete(e);

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

@@ -38,9 +38,7 @@ public class ChannelDataAccessor {
      * 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 com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor#withChannel(net.minecraft.item.ItemStack, String)}
-     *                    call
+     * @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
@@ -109,13 +107,13 @@ public class ChannelDataAccessor {
      * 
      * @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        positive subchannel data
+     * @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 (data < 1) throw new IllegalArgumentException("Channel data must be positive");
         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());
@@ -148,12 +146,7 @@ public class ChannelDataAccessor {
      */
     public static void wipeChannelData(ItemStack masterStack) {
         if (masterStack == null) throw new IllegalArgumentException();
-        if (masterStack.stackTagCompound != null) {
-            masterStack.stackTagCompound.removeTag(SECONDARY_HINT_TAG);
-            if (masterStack.stackTagCompound.hasNoTags()) {
-                masterStack.stackTagCompound = null;
-            }
-        }
+        if (masterStack.stackTagCompound != null) masterStack.stackTagCompound.removeTag(SECONDARY_HINT_TAG);
     }
 
     /**

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

@@ -26,7 +26,7 @@ public class CommandConfigureChannels extends CommandBase {
     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. Values below 1 clear the channel";
+                + "<channel name> can have space in it. <value> must be positive integer";
     }
 
     @Override
@@ -108,14 +108,11 @@ public class CommandConfigureChannels extends CommandBase {
                     throw new WrongUsageException("%s not a valid value", args[args.length - 1]);
                 }
 
-                if (value < 1) {
-                    ChannelDataAccessor.unsetChannelData(heldItem, channel);
-                } else {
-                    ChannelDataAccessor.setChannelData(heldItem, channel, value);
-                }
+                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(value < 1 ? channel + " no value" : channel + " value: " + value));
+                sender.addChatMessage(new ChatComponentText(channel + " value: " + value));
                 break;
         }
     }

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

@@ -1,6 +1,5 @@
 package com.gtnewhorizon.structurelib.core;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
@@ -8,9 +7,7 @@ import java.util.Set;
 
 import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
 
-import cpw.mods.fml.relauncher.FMLLaunchHandler;
 import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
-import cpw.mods.fml.relauncher.Side;
 
 @IFMLLoadingPlugin.MCVersion("1.7.10")
 public class StructureLibCore implements IFMLLoadingPlugin, IEarlyMixinLoader {
@@ -47,11 +44,6 @@ public class StructureLibCore implements IFMLLoadingPlugin, IEarlyMixinLoader {
 
     @Override
     public List<String> getMixins(Set<String> loadedCoreMods) {
-        List<String> mixins = new ArrayList<>(
-                Arrays.asList("blockChangeNotifier.MixinForgeHooks", "blockChangeNotifier.MixinWorld"));
-        if (FMLLaunchHandler.side() == Side.CLIENT) {
-            mixins.add("MixinGuiContainer_PickChannel");
-        }
-        return mixins;
+        return Arrays.asList("blockChangeNotifier.MixinForgeHooks", "blockChangeNotifier.MixinWorld");
     }
 }

src/main/java/com/gtnewhorizon/structurelib/mixins/early/MixinGuiContainer_PickChannel.java

@@ -1,64 +0,0 @@
-package com.gtnewhorizon.structurelib.mixins.early;
-
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.GuiScreen;
-import net.minecraft.client.gui.inventory.GuiContainer;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.inventory.Slot;
-import net.minecraft.item.ItemStack;
-
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.gen.Invoker;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
-
-import com.gtnewhorizon.structurelib.ChannelPickHandler;
-import com.gtnewhorizon.structurelib.ChannelWipeConfirmation;
-import com.gtnewhorizon.structurelib.StructureLib;
-import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
-
-import codechicken.nei.NEIClientConfig;
-import codechicken.nei.guihook.GuiContainerManager;
-import cpw.mods.fml.common.Loader;
-
-@Mixin(value = GuiContainer.class, priority = 100)
-public abstract class MixinGuiContainer_PickChannel {
-
-    @Inject(method = "mouseClicked(III)V", at = @At("HEAD"), cancellable = true)
-    private void slib$onMouseClicked(int mouseX, int mouseY, int mouseButton, CallbackInfo ci) {
-        if (mouseButton != 2) return;
-
-        EntityPlayer player = Minecraft.getMinecraft().thePlayer;
-        if (player == null) return;
-
-        ItemStack cursorStack = player.inventory.getItemStack();
-        if (cursorStack == null || !(cursorStack.getItem() instanceof ItemConstructableTrigger)) return;
-
-        // Sink middle click as soon as projector is picked up
-        ci.cancel();
-
-        ItemStack hoveredStack = null;
-        try {
-            Slot slot = slib$invokeGetSlotAtPosition(mouseX, mouseY);
-            if (slot != null) {
-                hoveredStack = slot.getStack();
-            }
-
-            // try NEI
-            if (hoveredStack == null && Loader.isModLoaded("NotEnoughItems") && !NEIClientConfig.isHidden()) {
-                hoveredStack = GuiContainerManager.getStackMouseOver((GuiContainer) (Object) this);
-            }
-        } catch (Exception e) {
-            StructureLib.LOGGER.error("Error while resolving hovered slot for channel pick", e);
-        }
-
-        boolean isSneaking = GuiScreen.isShiftKeyDown();
-        if (isSneaking && !ChannelWipeConfirmation.confirm(player)) return;
-
-        ChannelPickHandler.handleMiddleClick(player, cursorStack, hoveredStack, isSneaking);
-    }
-
-    @Invoker("getSlotAtPosition")
-    protected abstract Slot slib$invokeGetSlotAtPosition(int x, int y);
-}

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

@@ -23,22 +23,15 @@ import io.netty.buffer.ByteBuf;
 public class SetChannelDataMessage implements IMessage {
 
     private final List<Map.Entry<String, Integer>> data = new ArrayList<>();
-    private boolean onCursor;
 
     public SetChannelDataMessage() {}
 
     public SetChannelDataMessage(ItemStack trigger) {
-        this(trigger, false);
-    }
-
-    public SetChannelDataMessage(ItemStack trigger, final boolean onCursor) {
-        this.onCursor = onCursor;
         ChannelDataAccessor.iterateChannelData(trigger).forEach(data::add);
     }
 
     @Override
     public void fromBytes(ByteBuf buf) {
-        onCursor = buf.readBoolean();
         data.clear();
         int size = ByteBufUtils.readVarShort(buf);
         for (int i = 0; i < size; i++) {
@@ -48,7 +41,6 @@ public class SetChannelDataMessage implements IMessage {
 
     @Override
     public void toBytes(ByteBuf buf) {
-        buf.writeBoolean(onCursor);
         ByteBufUtils.writeVarShort(buf, data.size());
         for (Entry<String, Integer> e : data) {
             ByteBufUtils.writeUTF8String(buf, e.getKey());
@@ -61,11 +53,11 @@ public class SetChannelDataMessage implements IMessage {
         @Override
         public IMessage onMessage(SetChannelDataMessage message, MessageContext ctx) {
             EntityPlayerMP player = ctx.getServerHandler().playerEntity;
-            ItemStack target = message.onCursor ? player.inventory.getItemStack() : player.getHeldItem();
-            if (target != null && target.getItem() instanceof ItemConstructableTrigger) {
-                ChannelDataAccessor.wipeChannelData(target);
+            ItemStack heldItem = player.getHeldItem();
+            if (heldItem != null && heldItem.getItem() instanceof ItemConstructableTrigger) {
+                ChannelDataAccessor.wipeChannelData(heldItem);
                 for (Entry<String, Integer> e : message.data) {
-                    ChannelDataAccessor.setChannelData(target, e.getKey(), e.getValue());
+                    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
@@ -73,7 +65,7 @@ public class SetChannelDataMessage implements IMessage {
                 StructureLib.LOGGER.warn(
                         "{} trying to set channel data on {}, which is not a hologram projector!",
                         player.getUniqueID(),
-                        target);
+                        heldItem);
             }
             return null;
         }

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

@@ -1,98 +0,0 @@
-package com.gtnewhorizon.structurelib.structure;
-
-/**
- * Describes a channel used by one structure definition.
- *
- * <p>
- * Channel values are integers stored on the constructable trigger item. Implementations may override the default
- * validation and normalization policy when a simple bounded range is not sufficient.
- * </p>
- */
-public interface IChannelDefinition {
-
-    /**
-     * Creates a channel with a bounded inclusive range and clamping normalization.
-     *
-     * @param channel      channel identifier
-     * @param minimumValue inclusive minimum value
-     * @param maximumValue inclusive maximum value
-     * @return bounded channel definition
-     */
-    static IChannelDefinition bounded(String channel, int minimumValue, int maximumValue) {
-        if (minimumValue < 1 || maximumValue < minimumValue) {
-            throw new IllegalArgumentException("Invalid channel bounds");
-        }
-        return new IChannelDefinition() {
-
-            @Override
-            public String getChannel() {
-                return channel;
-            }
-
-            @Override
-            public int getMinimumValue() {
-                return minimumValue;
-            }
-
-            @Override
-            public int getMaximumValue() {
-                return maximumValue;
-            }
-        };
-    }
-
-    /**
-     * Creates a channel accepting every positive integer.
-     *
-     * @param channel channel identifier
-     * @return unbounded channel definition
-     */
-    static IChannelDefinition unbounded(String channel) {
-        return () -> channel;
-    }
-
-    /**
-     * Returns the lower-case channel identifier.
-     *
-     * @return channel identifier
-     */
-    String getChannel();
-
-    /**
-     * Returns the smallest value advertised by this definition. The default is {@code 1}.
-     *
-     * @return minimum value
-     */
-    default int getMinimumValue() {
-        return 1;
-    }
-
-    /**
-     * Returns the largest value advertised by this definition. The default is {@link java.lang.Integer#MAX_VALUE}.
-     *
-     * @return maximum value
-     */
-    default int getMaximumValue() {
-        return Integer.MAX_VALUE;
-    }
-
-    /**
-     * Checks whether a value is already valid without normalization.
-     *
-     * @param value value to check
-     * @return true when the value is valid
-     */
-    default boolean isValueValid(int value) {
-        return value >= getMinimumValue() && value <= getMaximumValue();
-    }
-
-    /**
-     * Converts a stored value to the value used by the structure definition.
-     *
-     * @param value stored value
-     * @return normalized value
-     */
-    default int normalizeValue(int value) {
-        return Math.max(getMinimumValue(), Math.min(getMaximumValue(), value));
-    }
-}

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

@@ -3,8 +3,6 @@ package com.gtnewhorizon.structurelib.structure;
 import static com.gtnewhorizon.structurelib.structure.IStructureWalker.ignoreBlockUnloaded;
 import static com.gtnewhorizon.structurelib.structure.IStructureWalker.skipBlockUnloaded;
 
-import java.util.Collection;
-import java.util.Collections;
 import java.util.function.Function;
 
 import net.minecraft.entity.player.EntityPlayer;
@@ -58,48 +56,6 @@ import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
  */
 public interface IStructureDefinition<T> {
 
-    /**
-     * Returns channel definitions declared by this structure.
-     *
-     * @return an immutable or otherwise read-only channel collection
-     */
-    default Collection<IChannelDefinition> getChannelDefinitions() {
-        return Collections.emptyList();
-    }
-
-    /**
-     * Returns channel definitions explicitly added by the structure builder.
-     *
-     * @return explicitly declared channel definitions
-     */
-    default Collection<IChannelDefinition> getExplicitChannelDefinitions() {
-        return getChannelDefinitions();
-    }
-
-    /**
-     * Finds a channel definition by identifier.
-     *
-     * @param channel channel identifier
-     * @return channel definition, or {@code null} when it is not declared
-     */
-    default IChannelDefinition getChannelDefinition(String channel) {
-        for (IChannelDefinition definition : getChannelDefinitions()) {
-            if (definition.getChannel().equals(channel)) return definition;
-        }
-        return null;
-    }
-
-    /**
-     * Reads one channel using the standard trigger-item channel semantics.
-     *
-     * @param trigger trigger item containing channel data
-     * @param channel channel identifier
-     * @return stored channel data, or the trigger stack size when absent
-     */
-    default int getChannelData(ItemStack trigger, String channel) {
-        return ChannelDataAccessor.getChannelData(trigger, channel);
-    }
-
     /**
      * Used internally
      * <p>
@@ -111,7 +67,7 @@ public interface IStructureDefinition<T> {
      * @throws java.util.NoSuchElementException if the given structure piece is not found and the moon phase perfectly
      *                                          matches
      */
-    IStructureElement<T>[] getStructureFor(String name);
+    IStructureElement<? super T>[] getStructureFor(String name);
 
     boolean isContainedInStructure(String name, int offsetA, int offsetB, int offsetC);
 
@@ -400,7 +356,7 @@ public interface IStructureDefinition<T> {
      * @return true if iteration completed successfully.
      * @param <T> type of context object.
      */
-    static <T> boolean iterate(T object, ItemStack trigger, IStructureElement<T>[] elements, World world,
+    static <T> boolean iterate(T object, ItemStack trigger, IStructureElement<? super T>[] elements, World world,
             ExtendedFacing extendedFacing, int basePositionX, int basePositionY, int basePositionZ, int basePositionA,
             int basePositionB, int basePositionC, boolean hintsOnly, Boolean checkBlocksIfNotNullForceCheckAllIfTrue) {
         if (!world.isRemote && hintsOnly) {

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

@@ -4,7 +4,6 @@ import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
 import static com.gtnewhorizon.structurelib.StructureLib.PANIC_MODE;
 
 import java.util.Arrays;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.function.Consumer;
@@ -29,20 +28,14 @@ import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
 /**
  * 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);
 
-    /**
-     * Returns the channels used by this element.
-     *
-     * @return lower-case channel identifiers
-     */
-    default Collection<String> getChannels() {
-        return Collections.emptySet();
-    }
-
     /**
      * 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
@@ -223,7 +216,7 @@ public interface IStructureElement<T> {
      * Forget the messed up class dependency graph for now. this is just so convenient.
      */
     default IStructureElementNoPlacement<T> noPlacement() {
-        return new IStructureElementNoPlacement<T>() {
+        return new IStructureElementNoPlacement<>() {
 
             @Override
             public boolean check(T t, World world, int x, int y, int z) {

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

@@ -21,11 +21,11 @@ import com.google.common.collect.Iterables;
  */
 public interface IStructureElementChain<T> extends IStructureElement<T> {
 
-    IStructureElement<T>[] fallbacks();
+    IStructureElement<? super T>[] fallbacks();
 
     @Override
     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.check(t, world, x, y, z)) {
                 return true;
             }
@@ -35,7 +35,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
 
     @Override
     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.couldBeValid(t, world, x, y, z, trigger)) {
                 return true;
             }
@@ -45,7 +45,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
 
     @Override
     default boolean spawnHint(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.spawnHint(t, world, x, y, z, trigger)) {
                 return true;
             }
@@ -55,7 +55,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
 
     @Override
     default boolean placeBlock(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)) {
                 return true;
             }
@@ -67,7 +67,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
     @Override
     default List<String> getDescription(T context) {
         Set<String> descriptions = new LinkedHashSet<>();
-        for (IStructureElement<T> fallback : fallbacks()) {
+        for (IStructureElement<? super T> fallback : fallbacks()) {
             List<String> desc = fallback.getDescription(context);
             if (desc != null) {
                 descriptions.addAll(desc);
@@ -82,7 +82,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
             AutoPlaceEnvironment env) {
         Predicate<ItemStack> predicate = null;
         List<Iterable<ItemStack>> is = new ArrayList<>();
-        for (IStructureElement<T> fallback : fallbacks()) {
+        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();
@@ -99,7 +99,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
             EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
         boolean allContinue = true;
         List<IChatComponent> bufferedNoise = new ArrayList<>();
-        for (IStructureElement<T> fallback : fallbacks()) {
+        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:
@@ -124,7 +124,7 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
             AutoPlaceEnvironment env) {
         boolean allContinue = true;
         List<IChatComponent> bufferedNoise = new ArrayList<>();
-        for (IStructureElement<T> fallback : fallbacks()) {
+        for (IStructureElement<? super T> fallback : fallbacks()) {
             PlaceResult result = fallback
                     .survivalPlaceBlock(t, world, x, y, z, trigger, env.withChatter(bufferedNoise::add));
             switch (result) {

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

@@ -10,36 +10,36 @@ 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) {
+    default boolean check(Object t, World world, int x, int y, int z) {
         return true;
     }
 
     @Override
-    default boolean couldBeValid(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;
     }
 
     @Override
-    default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean spawnHint(Object t, World world, int x, int y, int z, ItemStack trigger) {
         return true;
     }
 
     @Override
-    default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+    default boolean placeBlock(Object t, World world, int x, int y, int z, ItemStack trigger) {
         return true;
     }
 
     @Override
-    default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
+    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(T t, World world, int x, int y, int z, ItemStack trigger,
+    default PlaceResult survivalPlaceBlock(Object t, World world, int x, int y, int z, ItemStack trigger,
             AutoPlaceEnvironment env) {
         return PlaceResult.SKIP;
     }

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

@@ -21,40 +21,42 @@ public interface IStructureWalker<T> {
      * @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<T> element, World world, int x, int y, int z, int a, int b, int c);
+    boolean visit(IStructureElement<? super T> element, World world, int x, int y, int z, int a, int b, int c);
 
-    default boolean blockNotLoaded(IStructureElement<T> element, World world, int x, int y, int z, int a, int b,
+    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<T>() {
+        return new IStructureWalker<>() {
 
             @Override
-            public boolean visit(IStructureElement<T> element, World world, int x, int y, int z, int a, int b, int c) {
+            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<T> element, World world, int x, int y, int z, int a, int b,
-                    int c) {
+            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<T>() {
+        return new IStructureWalker<>() {
 
             @Override
-            public boolean visit(IStructureElement<T> element, World world, int x, int y, int z, int a, int b, int c) {
+            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<T> element, World world, int x, int y, int z, int a, int b,
-                    int c) {
+            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/LazyStructureElement.java

@@ -13,14 +13,14 @@ import net.minecraft.world.World;
 
 class LazyStructureElement<T> implements IStructureElementDeferred<T> {
 
-    private Function<T, IStructureElement<T>> to;
-    private IStructureElement<T> elem;
+    private Function<? super T, ? extends IStructureElement<? super T>> to;
+    private IStructureElement<? super T> elem;
 
-    public LazyStructureElement(Function<T, IStructureElement<T>> to) {
+    public LazyStructureElement(Function<? super T, ? extends IStructureElement<? super T>> to) {
         this.to = to;
     }
 
-    private IStructureElement<T> get(T t) {
+    private IStructureElement<? super T> get(T t) {
         if (to != null) {
             elem = to.apply(t);
             to = null;

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

@@ -5,12 +5,8 @@ import static com.gtnewhorizon.structurelib.structure.StructureUtility.notAir;
 import static com.gtnewhorizon.structurelib.structure.StructureUtility.step;
 
 import java.util.Arrays;
-import java.util.BitSet;
-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.NoSuchElementException;
 import java.util.Set;
@@ -20,31 +16,21 @@ import com.gtnewhorizon.structurelib.util.Vec3Impl;
 
 public class StructureDefinition<T> implements IStructureDefinition<T> {
 
-    private final Map<Character, IStructureElement<T>> elements;
+    private final Map<Character, IStructureElement<? super T>> elements;
     private final Map<String, String> shapes;
-    private final Map<String, IStructureElement<T>[]> structures;
-    private final Map<String, OccupiedSpace> occupiedSpaces;
-    private final Map<String, IChannelDefinition> channelDefinitions;
-    private final Set<String> explicitChannels;
-    private final Collection<IChannelDefinition> channelDefinitionValues;
-    private final Collection<IChannelDefinition> explicitChannelDefinitions;
+    private final Map<String, IStructureElement<? super T>[]> structures;
+    private final Map<String, Set<Vec3Impl>> occupiedSpaces;
 
     public static <B> Builder<B> builder() {
         return new Builder<>();
     }
 
-    private StructureDefinition(Map<Character, IStructureElement<T>> elements, Map<String, String> shapes,
-            Map<String, IStructureElement<T>[]> structures, Map<String, OccupiedSpace> occupiedSpaces,
-            Map<String, IChannelDefinition> channelDefinitions, Set<String> explicitChannels) {
+    private StructureDefinition(Map<Character, IStructureElement<? super T>> elements, Map<String, String> shapes,
+            Map<String, IStructureElement<? super T>[]> structures, Map<String, Set<Vec3Impl>> occupiedSpaces) {
         this.elements = elements;
         this.shapes = shapes;
         this.structures = structures;
         this.occupiedSpaces = occupiedSpaces;
-        this.channelDefinitions = Collections.unmodifiableMap(new HashMap<>(channelDefinitions));
-        this.explicitChannels = Collections.unmodifiableSet(new HashSet<>(explicitChannels));
-        this.channelDefinitionValues = Collections.unmodifiableCollection(this.channelDefinitions.values());
-        this.explicitChannelDefinitions = Collections.unmodifiableList(
-                this.explicitChannels.stream().map(this.channelDefinitions::get).collect(Collectors.toList()));
     }
 
     public static class Builder<T> {
@@ -54,22 +40,18 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         private static final char C = '\uC000';
         private char d = '\uD000';
         private final Map<Vec3Impl, Character> navigates;
-        private final Map<Character, IStructureElement<T>> elements;
+        private final Map<Character, IStructureElement<? super T>> elements;
         private final Map<String, String> shapes;
-        private final Map<String, OccupiedSpace> occupiedSpaces;
-        private final Map<String, IChannelDefinition> channels;
-        private final Set<String> explicitChannels;
+        private final Map<String, Set<Vec3Impl>> occupiedSpaces;
 
         private Builder() {
             navigates = new HashMap<>();
             elements = new HashMap<>();
             shapes = new HashMap<>();
             occupiedSpaces = new HashMap<>();
-            channels = new HashMap<>();
-            explicitChannels = new HashSet<>();
         }
 
-        public Map<Character, IStructureElement<T>> getElements() {
+        public Map<Character, IStructureElement<? super T>> getElements() {
             return elements;
         }
 
@@ -113,19 +95,7 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
                 }
                 builder.setLength(builder.length() - 1);
             }
-            int sizeA = 0;
-            int sizeB = 0;
-            long occupiedCount = 0;
-            for (String[] strings : structurePiece) {
-                sizeB = Math.max(sizeB, strings.length);
-                for (String string : strings) {
-                    sizeA = Math.max(sizeA, string.length());
-                    for (int i = 0; i < string.length(); i++) {
-                        if (string.charAt(i) != ' ') occupiedCount++;
-                    }
-                }
-            }
-            OccupiedSpace occupiedSpace = new OccupiedSpace(sizeA, sizeB, structurePiece.length, occupiedCount);
+            Set<Vec3Impl> occupiedSpace = new HashSet<>();
             // these track the global current location
             int aa = 0, bb = 0, cc = 0;
             // these track the vec3 towards next meaningful element
@@ -139,7 +109,7 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
                 } else if (ch == '~') {
                     builder.setCharAt(i, A);
                     ch = A;
-                    occupiedSpace.add(aa, bb, cc);
+                    occupiedSpace.add(Vec3Impl.getFromPool(aa, bb, cc));
                 }
                 if (ch == A) {
                     aa++;
@@ -165,13 +135,13 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
                         addElement(navigate, step(vec3));
                     }
                     builder.setCharAt(i - 1, navigate);
-                    occupiedSpace.add(aa, bb, cc);
+                    occupiedSpace.add(Vec3Impl.getFromPool(aa, bb, cc));
                     aa++;
                     a = 0;
                     b = 0;
                     c = 0;
                 } else {
-                    occupiedSpace.add(aa, bb, cc);
+                    occupiedSpace.add(Vec3Impl.getFromPool(aa, bb, cc));
                     aa++;
                 }
             }
@@ -211,66 +181,27 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
          * @deprecated use the unboxed version
          */
         @Deprecated
-        public Builder<T> addElement(Character name, IStructureElement<T> structurePiece) {
-            if (elements.putIfAbsent(name, structurePiece) == null) registerElementChannel(structurePiece);
+        public Builder<T> addElement(Character name, IStructureElement<? super T> structurePiece) {
+            elements.putIfAbsent(name, structurePiece);
             return this;
         }
 
-        public Builder<T> addElement(char name, IStructureElement<T> structurePiece) {
-            if (elements.putIfAbsent(name, structurePiece) == null) registerElementChannel(structurePiece);
+        public Builder<T> addElement(char name, IStructureElement<? super T> structurePiece) {
+            elements.putIfAbsent(name, structurePiece);
             return this;
         }
 
-        public Builder<T> addChannel(IChannelDefinition definition) {
-            validateChannelDefinition(definition);
-            channels.put(definition.getChannel(), definition);
-            explicitChannels.add(definition.getChannel());
-            return this;
-        }
-
-        public Builder<T> addChannel(String channel, int minimumValue, int maximumValue) {
-            return addChannel(IChannelDefinition.bounded(channel, minimumValue, maximumValue));
-        }
-
-        private void registerElementChannel(IStructureElement<T> structurePiece) {
-            for (String channel : structurePiece.getChannels()) {
-                validateChannelName(channel);
-                if (!explicitChannels.contains(channel)) {
-                    channels.putIfAbsent(channel, IChannelDefinition.unbounded(channel));
-                }
-            }
-        }
-
-        private void validateChannelDefinition(IChannelDefinition definition) {
-            if (definition == null) throw new IllegalArgumentException("Channel definition cannot be null");
-            validateChannelName(definition.getChannel());
-            if (definition.getMinimumValue() < 1 || definition.getMaximumValue() < definition.getMinimumValue()) {
-                throw new IllegalArgumentException("Invalid channel definition values");
-            }
-        }
-
-        private void validateChannelName(String channel) {
-            if (channel == null || channel.isEmpty() || !channel.toLowerCase(Locale.ROOT).equals(channel)) {
-                throw new IllegalArgumentException("Channel name must be non-empty and lower case");
-            }
-        }
-
         public IStructureDefinition<T> build() {
-            for (IStructureElement<T> element : elements.values()) {
-                registerElementChannel(element);
-            }
-            Map<String, IStructureElement<T>[]> structures = compileStructureMap();
+            Map<String, IStructureElement<? super T>[]> structures = compileStructureMap();
             return new StructureDefinition<>(
                     new HashMap<>(elements),
                     new HashMap<>(shapes),
                     structures,
-                    occupiedSpaces,
-                    channels,
-                    explicitChannels);
+                    occupiedSpaces);
         }
 
         @SuppressWarnings("unchecked")
-        private Map<String, IStructureElement<T>[]> compileElementSetMap() {
+        private Map<String, IStructureElement<? super T>[]> compileElementSetMap() {
             Set<Integer> missing = findMissing();
             if (missing.isEmpty()) {
                 return shapes.entrySet().stream().collect(
@@ -286,7 +217,7 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         }
 
         @SuppressWarnings("unchecked")
-        private Map<String, IStructureElement<T>[]> compileStructureMap() {
+        private Map<String, IStructureElement<? super T>[]> compileStructureMap() {
             Set<Integer> missing = findMissing();
             if (missing.isEmpty()) {
                 return shapes.entrySet().stream().collect(
@@ -307,7 +238,7 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         }
     }
 
-    public Map<Character, IStructureElement<T>> getElements() {
+    public Map<Character, IStructureElement<? super T>> getElements() {
         return elements;
     }
 
@@ -315,77 +246,21 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         return shapes;
     }
 
-    public Map<String, IStructureElement<T>[]> getStructures() {
+    public Map<String, IStructureElement<? super T>[]> getStructures() {
         return structures;
     }
 
     @Override
-    public Collection<IChannelDefinition> getChannelDefinitions() {
-        return channelDefinitionValues;
-    }
-
-    @Override
-    public Collection<IChannelDefinition> getExplicitChannelDefinitions() {
-        return explicitChannelDefinitions;
-    }
-
-    @Override
-    public IChannelDefinition getChannelDefinition(String channel) {
-        return channelDefinitions.get(channel);
-    }
-
-    @Override
-    public IStructureElement<T>[] getStructureFor(String name) {
-        IStructureElement<T>[] elements = structures.get(name);
+    public IStructureElement<? super T>[] getStructureFor(String name) {
+        IStructureElement<? super T>[] elements = structures.get(name);
         if (elements == null) throw new NoSuchElementException(name);
         return elements;
     }
 
     @Override
     public boolean isContainedInStructure(String name, int offsetA, int offsetB, int offsetC) {
-        OccupiedSpace occupiedSpace = occupiedSpaces.get(name);
+        Set<Vec3Impl> occupiedSpace = occupiedSpaces.get(name);
         if (occupiedSpace == null) throw new NoSuchElementException(name);
-        return occupiedSpace.contains(offsetA, offsetB, offsetC);
-    }
-
-    private static class OccupiedSpace {
-
-        private final int sizeA;
-        private final int sizeB;
-        private final int sizeC;
-        private final BitSet occupied;
-        private final Set<Vec3Impl> sparseOccupied;
-
-        private OccupiedSpace(int sizeA, int sizeB, int sizeC, long occupiedCount) {
-            this.sizeA = sizeA;
-            this.sizeB = sizeB;
-            this.sizeC = sizeC;
-            long volume = (long) sizeA * sizeB * sizeC;
-            if (volume <= Integer.MAX_VALUE && volume <= Math.max(1024L, occupiedCount * 256L)) {
-                occupied = new BitSet((int) volume);
-                sparseOccupied = null;
-            } else {
-                occupied = null;
-                sparseOccupied = new HashSet<>();
-            }
-        }
-
-        private void add(int a, int b, int c) {
-            if (occupied != null) {
-                occupied.set(index(a, b, c));
-            } else {
-                sparseOccupied.add(new Vec3Impl(a, b, c));
-            }
-        }
-
-        private boolean contains(int a, int b, int c) {
-            if (a < 0 || b < 0 || c < 0 || a >= sizeA || b >= sizeB || c >= sizeC) return false;
-            if (occupied != null) return occupied.get(index(a, b, c));
-            return sparseOccupied.contains(new Vec3Impl(a, b, c));
-        }
-
-        private int index(int a, int b, int c) {
-            return (c * sizeB + b) * sizeA + a;
-        }
+        return occupiedSpace.contains(new Vec3Impl(offsetA, offsetB, offsetC));
     }
 }

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

@@ -37,7 +37,7 @@ class SurvivalBuildStructureWalker<T> implements IStructureWalker<T> {
     }
 
     @Override
-    public boolean visit(IStructureElement<T> element, World world, int x, int y, int z, int a, int b, int c) {
+    public boolean visit(IStructureElement<? super T> element, World world, int x, int y, int z, int a, int b, int c) {
         env.offsetABC[0] = a;
         env.offsetABC[1] = b;
         env.offsetABC[2] = c;

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

@@ -1,64 +0,0 @@
-package com.gtnewhorizon.structurelib.util;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Iterator;
-import java.util.List;
-import java.util.NavigableMap;
-import java.util.Spliterator;
-import java.util.TreeMap;
-import java.util.function.Consumer;
-
-public class SortedRegistry<V> implements Iterable<V> {
-
-    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();
-
-    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);
-        }
-        // TODO allow a user to edit the order with a configuration file
-        baked = new ArrayList<>(store.values());
-    }
-
-    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);
-    }
-
-    @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/javadoc/overview.html

@@ -174,37 +174,6 @@ StructureLib API documentation.
     master channel.
 </p>
 
-<h3>Metadata-only channels</h3>
-
-<p>
-    A channel does not need to represent a block or an element in a structure shape. Structure definitions can declare
-    metadata-only channels for values such as a widget selection or a variable structure height. These declarations are
-    independent of <code>addElement</code> and do not require a fake block or a shape character.
-</p>
-
-<pre>
-IStructureDefinition.&lt;Controller&gt;builder()
-        .addChannel("height", 3, 100)
-        .addChannel("length", 4, 50)
-        .addChannel(IChannelDefinition.unbounded("widget"))
-        .addElement('A', ...)
-        .build();
-</pre>
-
-<p>
-    Channel values are still stored as integers in the trigger item's <code>channels</code> NBT compound. The
-    generic channel GUI has no active structure definition, so it edits integers and does not impose one
-    structure's range on every other structure using the same channel name. Structure-aware code reads values through
-    <code>IStructureDefinition#getChannelData</code>, which uses the definition's default when the subchannel is absent
-    and then applies that definition's local normalization policy.
-</p>
-
-<p>
-    Existing elements wrapped with <code>StructureUtility.withChannel</code> are discovered automatically. An explicit
-    channel declaration supplies its local range and normalization policy for that structure. The same channel name may
-    therefore use different ranges in different structure definitions.
-</p>
-
 <h3>why is this called channel?</h3>
 
 Just give me a better name and I'd do the renaming.

src/main/resources/assets/structurelib/lang/en_US.lang

@@ -44,11 +44,7 @@ item.structurelib.constructableTrigger.gui.info=Many multiblocks support some de
 channels.structurelib.show_errors=When set, will highlight parts of the multiblock that is definitely wrong
 
 structurelib.tooltip.channelvalue=§7Value §b%d§r§7 for subchannel §b%s
-structurelib.tooltip.indicator_dnd=Drop into GUI or middle-click to select this value for this channel
-structurelib.pickchannel.success=§aSet §b%s§r§a to §b%d§r
-structurelib.pickchannel.cleared=§aAll channels cleared§r
-structurelib.pickchannel.confirmwipe=§6Sneak+Middle-click again to clear all channels
-structurelib.pickchannel.nomapping=§cNo channel mapping found for this item
+structurelib.tooltip.indicator_dnd=Drop into GUI to select this value for this channel
 
 structurelib.autoplace.built_stat=Built %s blocks
 structurelib.autoplace.complete=§aThis multiblock has completed!