restore compatibility with inventory tweaks

src/api/java/invtweaks/api/container/ChestContainer.java

@@ -0,0 +1,28 @@
+package invtweaks.api.container;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * A marker for containers that have a chest-like persistant storage component. Enables the Inventroy Tweaks sorting
+ * buttons for this container.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface ChestContainer {
+    // Size of a chest row
+    int rowSize() default 9;
+
+    // Uses 'large chest' mode for sorting buttons
+    // (Renders buttons vertically down the right side of the GUI)
+    boolean isLargeChest() default false;
+
+    // Annotation for method to get size of a chest row if it is not a fixed size for this container class
+    // Signature int func()
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.METHOD)
+    public @interface RowSizeCallback {
+    }
+}

src/main/java/cpw/mods/ironchest/ContainerIronChest.java

@@ -16,7 +16,9 @@ import net.minecraft.inventory.Container;
 import net.minecraft.inventory.IInventory;
 import net.minecraft.inventory.Slot;
 import net.minecraft.item.ItemStack;
+import invtweaks.api.container.ChestContainer;
 
+@ChestContainer(isLargeChest = true)
 public class ContainerIronChest extends Container {
     private IronChestType type;
     private EntityPlayer player;
@@ -115,4 +117,9 @@ public class ContainerIronChest extends Container {
     {
         return player;
     }
+    
+    @ChestContainer.RowSizeCallback
+    public int getNumColumns() {
+        return type.getRowLength();
+    }
 }