Introduced Capabilities for World (#3069)

src/main/java/net/minecraftforge/common/util/WorldCapabilityData.java

@@ -0,0 +1,57 @@
+package net.minecraftforge.common.util;
+
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.world.WorldProvider;
+import net.minecraft.world.WorldSavedData;
+
+public class WorldCapabilityData extends WorldSavedData
+{
+    public static final String ID = "capabilities";
+
+    private INBTSerializable<NBTTagCompound> serializable;
+    private NBTTagCompound capNBT = null;
+
+    public WorldCapabilityData(String name)
+    {
+        super(name);
+    }
+
+    public WorldCapabilityData(INBTSerializable<NBTTagCompound> serializable)
+    {
+        super(ID);
+        this.serializable = serializable;
+    }
+
+    @Override
+    public void readFromNBT(NBTTagCompound nbt)
+    {
+        this.capNBT = nbt;
+        if(serializable != null)
+        {
+            serializable.deserializeNBT(this.capNBT);
+            this.capNBT = null;
+        }
+    }
+
+    @Override
+    public NBTTagCompound writeToNBT(NBTTagCompound nbt)
+    {
+        return nbt = serializable.serializeNBT();
+    }
+
+    @Override
+    public boolean isDirty()
+    {
+        return true;
+    }
+
+    public void setCapabilities(WorldProvider provider, INBTSerializable<NBTTagCompound> capabilities)
+    {
+        this.serializable = capabilities;
+        if(this.capNBT != null)
+        {
+            serializable.deserializeNBT(this.capNBT);
+            this.capNBT = null;
+        }
+    }
+}

src/main/java/net/minecraftforge/event/AttachCapabilitiesEvent.java

@@ -133,4 +133,21 @@ public class AttachCapabilitiesEvent extends Event
             return this.stack;
         }
     }
+
+    /**
+     * A version of the parent event which is only fired for Worlds.
+     */
+    public static class World extends AttachCapabilitiesEvent
+    {
+        private final net.minecraft.world.World world;
+        public World(net.minecraft.world.World world)
+        {
+            super(world);
+            this.world = world;
+        }
+        public net.minecraft.world.World getWorld()
+        {
+            return this.world;
+        }
+    }
 }

src/main/java/net/minecraftforge/event/ForgeEventFactory.java

@@ -525,6 +525,10 @@ public class ForgeEventFactory
         return gatherCapabilities(new AttachCapabilitiesEvent.Item(item, stack), parent);
     }
 
+    public static CapabilityDispatcher gatherCapabilities(World world, ICapabilityProvider parent) {
+        return gatherCapabilities(new AttachCapabilitiesEvent.World(world), parent);
+    }
+
     private static CapabilityDispatcher gatherCapabilities(AttachCapabilitiesEvent event, ICapabilityProvider parent)
     {
         MinecraftForge.EVENT_BUS.post(event);