ForgePatch/forge/patches/minecraft_server/net/minecraft/src/Entity.java.patch

--- ../src_base/minecraft_server/net/minecraft/src/Entity.java	0000-00-00 00:00:00.000000000 -0000
+++ ../src_work/minecraft_server/net/minecraft/src/Entity.java	0000-00-00 00:00:00.000000000 -0000
@@ -165,6 +165,9 @@
     public boolean ignoreFrustumCheck;
     public boolean isAirBorne;
 
+    /** Forge: Used to store custom data for each entity. */
+    private NBTTagCompound customEntityData;
+    
     public Entity(World par1World)
     {
         this.entityId = nextEntityID++;
@@ -206,6 +209,20 @@
 
     protected abstract void entityInit();
 
+    /**
+     * Returns a NBTTagCompound that can be used to store custom data for this entity.
+     * It will be written, and read from disc, so it persists over world saves.
+     * @return A NBTTagCompound
+     */
+    public NBTTagCompound getEntityData()
+    {
+    	if (customEntityData == null)
+    	{
+    		customEntityData = new NBTTagCompound();
+    	}
+    	return customEntityData;
+    }
+    
     public DataWatcher getDataWatcher()
     {
         return this.dataWatcher;
@@ -1183,6 +1200,10 @@
         par1NBTTagCompound.setShort("Fire", (short)this.fire);
         par1NBTTagCompound.setShort("Air", (short)this.getAir());
         par1NBTTagCompound.setBoolean("OnGround", this.onGround);
+        if (customEntityData != null)
+        {
+            par1NBTTagCompound.setCompoundTag("ForgeData", customEntityData);
+        }
         this.writeEntityToNBT(par1NBTTagCompound);
     }
 
@@ -1224,6 +1245,10 @@
         this.onGround = par1NBTTagCompound.getBoolean("OnGround");
         this.setPosition(this.posX, this.posY, this.posZ);
         this.setRotation(this.rotationYaw, this.rotationPitch);
+        if (par1NBTTagCompound.hasKey("ForgeData"))
+        {
+            customEntityData = par1NBTTagCompound.getCompoundTag("ForgeData");
+        }
         this.readEntityFromNBT(par1NBTTagCompound);
     }