Itemstacks in the GameRegistry (manual registration by mods)

fml/common/cpw/mods/fml/common/registry/GameData.java

@@ -25,11 +25,13 @@ import java.util.logging.Level;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockSand;
 import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
 
 import com.google.common.base.Function;
 import com.google.common.base.Throwables;
+import com.google.common.collect.HashBasedTable;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableTable;
 import com.google.common.collect.ImmutableTable.Builder;
@@ -54,6 +56,7 @@ public class GameData {
     private static boolean shouldContinue = true;
     private static boolean isSaveValid = true;
     private static ImmutableTable<String, String, Integer> modObjectTable;
+    private static Table<String, String, ItemStack> customItemStacks = HashBasedTable.create();
     private static Map<String,String> ignoredMods;
 
     private static boolean isModIgnoredForIdValidation(String modId)
@@ -299,4 +302,31 @@ public class GameData {
         }
         return Block.field_71973_m[blockId];
     }
+
+    static ItemStack findItemStack(String modId, String name)
+    {
+        ItemStack is = customItemStacks.get(modId, name);
+        if (is == null)
+        {
+            Item i = findItem(modId, name);
+            if (i != null)
+            {
+                is = new ItemStack(i, 0 ,0);
+            }
+        }
+        if (is == null)
+        {
+            Block b = findBlock(modId, name);
+            if (b != null)
+            {
+                is = new ItemStack(b, 0, 0);
+            }
+        }
+        return is;
+    }
+
+    static void registerCustomItemStack(String name, ItemStack itemStack)
+    {
+        customItemStacks.put(Loader.instance().activeModContainer().getModId(), name, itemStack);
+    }
 }

fml/common/cpw/mods/fml/common/registry/GameRegistry.java

@@ -394,4 +394,27 @@ public class GameRegistry
     {
         return GameData.findItem(modId, name);
     }
+
+	/**
+	 * Manually register a custom item stack with FML for later tracking. It is automatically scoped with the active modid
+	 *
+	 * @param name The name to register it under
+	 * @param itemStack The itemstack to register
+	 */
+	public static void registerCustomItemStack(String name, ItemStack itemStack)
+	{
+	    GameData.registerCustomItemStack(name, itemStack);
+	}
+	/**
+	 * Lookup an itemstack based on mod and name. It will create "default" itemstacks from blocks and items if no
+	 * explicit itemstack is found.
+	 *
+	 * @param modId The modid of the stack owner
+	 * @param name The name of the stack
+	 * @return The custom itemstack or null if no such itemstack was found
+	 */
+	public static ItemStack findItemStack(String modId, String name)
+	{
+	    return GameData.findItemStack(modId, name);
+	}
 }