Added IChunkLoadTile

src/codechicken/lib/world/IChunkLoadTile.java

@@ -0,0 +1,12 @@
+package codechicken.lib.world;
+
+/**
+ * Provides a callback for tile entities when a chunk is loaded, as an alternative to validate when the chunk hasn't been added to the world.
+ * To hook all world join/seperate events. Use this, TileEntity.validate with a worldObj.blockExists check, TileEntity.onChunkUnload and TileEntity.invalidate
+ * Be sure to call TileChunkLoadHook.init() from your mod during initialisation
+ * You could easily implement this in your own mod, but providing it here reduces the number of times the chunkTileEntityMap needs to be iterated
+ */
+public interface IChunkLoadTile
+{
+    public void onChunkLoad();
+}

src/codechicken/lib/world/TileChunkLoadHook.java

@@ -0,0 +1,24 @@
+package codechicken.lib.world;
+
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.world.ChunkEvent;
+
+public class TileChunkLoadHook
+{
+    private static boolean init;
+    public static void init() {
+        if(init) return;
+        init = true;
+
+        MinecraftForge.EVENT_BUS.register(new TileChunkLoadHook());
+    }
+
+    @SubscribeEvent
+    public void onChunkLoad(ChunkEvent.Load event) {
+        for(TileEntity t : ((Iterable<TileEntity>)event.getChunk().chunkTileEntityMap.values()))
+            if(t instanceof IChunkLoadTile)
+                ((IChunkLoadTile)t).onChunkLoad();
+    }
+}