ChestGui and Item utility improvements.

src/com/massivecraft/massivecore/chestgui/ChestGui.java

@@ -17,20 +17,52 @@ public class ChestGui
 	// REGISTRY
 	// -------------------------------------------- //
 	
-	private static final Map<Inventory, ChestGui> inventoryToGui = new MassiveMap<>();
+	protected static final Map<Inventory, ChestGui> inventoryToGui = new MassiveMap<>();
 	public static Map<Inventory, ChestGui> getInventoryToGui() { return inventoryToGui; }
-	public static ChestGui remove(Inventory inventory) { return inventoryToGui.remove(inventory); }
-	public static ChestGui set(Inventory inventory, ChestGui gui) { return inventoryToGui.put(inventory, gui); }
+	
 	public static ChestGui get(Inventory inventory) { return inventoryToGui.get(inventory); }
 	public static ChestGui getCreative(Inventory inventory)
 	{
+		if (inventory == null) throw new NullPointerException("inventory");
+		
 		ChestGui gui = get(inventory);
 		if (gui != null) return gui;
+		
 		gui = new ChestGui();
-		set(inventory, gui);
+		gui.setInventory(inventory);
+		gui.add();
+		
 		return gui;
 	}
 	
+	private static void add(Inventory inventory, ChestGui gui) { inventoryToGui.put(inventory, gui); }
+	private static void remove(Inventory inventory) { inventoryToGui.remove(inventory); }
+	
+	// -------------------------------------------- //
+	// ADD & REMOVE
+	// -------------------------------------------- //
+	// Done through instance for override possibilities.
+	
+	public void add()
+	{
+		add(this.getInventory(), this);
+	}
+	
+	public void remove()
+	{
+		remove(this.getInventory());
+	}
+	
+	// -------------------------------------------- //
+	// INVENTORY
+	// -------------------------------------------- //
+	// It is useful to provide a link back from the GUI to the inventory.
+	// This way we have can look up between Inventory and ChestGui both ways.
+	
+	private Inventory inventory = null;
+	public Inventory getInventory() { return this.inventory; }
+	public void setInventory(Inventory inventory) { this.inventory = inventory; }
+	
 	// -------------------------------------------- //
 	// ACTIONS
 	// -------------------------------------------- //
@@ -88,18 +120,18 @@ public class ChestGui
 	// The sound you should hear when clicking an action slot.
 	private SoundEffect soundClick = MassiveCoreMConf.get().clickSound;
 	public SoundEffect getSoundClick() { return this.soundClick; }
-	public ChestGui setSoundClick(SoundEffect soundClick) { this.soundClick = soundClick; return this; }
+	public void setSoundClick(SoundEffect soundClick) { this.soundClick = soundClick; }
 	
 	// The sound you should hear when opening the GUI.
 	private SoundEffect soundOpen = SoundEffect.valueOf("CHEST_OPEN", 0.75f, 1.0f);
 	public SoundEffect getSoundOpen() { return this.soundOpen; }
-	public ChestGui setSoundOpen(SoundEffect soundOpen) { this.soundOpen = soundOpen; return this; }
+	public void setSoundOpen(SoundEffect soundOpen) { this.soundOpen = soundOpen; }
 	
 	// The sound you should hear when closing the GUI.
 	// This sound will be skipped if another inventory was opened by the GUI action.
 	private SoundEffect soundClose = SoundEffect.valueOf("CHEST_CLOSE", 0.75f, 1.0f);
 	public SoundEffect getSoundClose() { return this.soundClose; }
-	public ChestGui setSoundClose(SoundEffect soundClose) { this.soundClose= soundClose; return this; }
+	public void setSoundClose(SoundEffect soundClose) { this.soundClose= soundClose; }
 	
 	// -------------------------------------------- //
 	// AUTOCLOSING
@@ -108,7 +140,16 @@ public class ChestGui
 	
 	private boolean autoclosing = true;
 	public boolean isAutoclosing() { return this.autoclosing; }
-	public ChestGui setAutoclosing(boolean autoclosing) { this.autoclosing = autoclosing; return this; }
+	public void setAutoclosing(boolean autoclosing) { this.autoclosing = autoclosing; }
+	
+	// -------------------------------------------- //
+	// AUTOREMOVING
+	// -------------------------------------------- //
+	// Should the GUI be automatically removed upon the inventory closing?
+	
+	private boolean autoremoving = true;
+	public boolean isAutoremoving() { return this.autoremoving; }
+	public void setAutoremoving(boolean autoremoving) { this.autoremoving = autoremoving; }
 	
 	// -------------------------------------------- //
 	// CONSTRUCT

src/com/massivecraft/massivecore/engine/EngineMassiveCoreChestGui.java

@@ -139,6 +139,8 @@ public class EngineMassiveCoreChestGui extends Engine
 			}
 		});
 		
+		if (gui.isAutoremoving())
+		{
 			// We save the inventory in the map for a little while.
 			// A plugin may want to do something upon the chest gui closing.
 			Bukkit.getScheduler().runTaskLater(this.getPlugin(), new Runnable()
@@ -146,9 +148,10 @@ public class EngineMassiveCoreChestGui extends Engine
 				@Override
 				public void run()
 				{
-				ChestGui.remove(inventory);
+					gui.remove();
 				}
 			}, 20);
 		}
+	}
 
 }

src/com/massivecraft/massivecore/item/DataItemStack.java

@@ -434,8 +434,6 @@ public class DataItemStack implements Comparable<DataItemStack>
 	{
 		if ( ! (object instanceof DataItemStack)) return false;
 		DataItemStack that = (DataItemStack)object;
-		
-		// TODO: Use compare instead to avoid bugs?
 		return MUtil.equals(
 			this.getId(), that.getId(),
 			this.getCount(), that.getCount(),
@@ -463,6 +461,50 @@ public class DataItemStack implements Comparable<DataItemStack>
 		);
 	}
 	
+	public boolean equalsItem(ItemStack item)
+	{
+		if (item == null) return false;
+		DataItemStack that = DataItemStack.fromBukkit(item);
+		return this.equals(that);
+	}
+	
+	public boolean isSimilar(DataItemStack that)
+	{
+		// Just copy equals and comment out count check.
+		return MUtil.equals(
+			this.getId(), that.getId(),
+			// this.getCount(), that.getCount(),
+			this.getDamage(), that.getDamage(),
+			this.getName(), that.getName(),
+			this.getLore(), that.getLore(),
+			this.getEnchants(), that.getEnchants(),
+			this.getRepaircost(), that.getRepaircost(),
+			this.getTitle(), that.getTitle(),
+			this.getAuthor(), that.getAuthor(),
+			this.getPages(), that.getPages(),
+			this.getColor(), that.getColor(),
+			this.isScaling(), that.isScaling(),
+			this.getPotionEffects(), that.getPotionEffects(),
+			this.getSkull(), that.getSkull(),
+			this.getFireworkEffect(), that.getFireworkEffect(),
+			this.getFireworkEffects(), that.getFireworkEffects(),
+			this.getFireworkFlight(), that.getFireworkFlight(),
+			this.getStoredEnchants(), that.getStoredEnchants(),
+			this.isUnbreakable(), that.isUnbreakable(),
+			this.getFlags(), that.getFlags(),
+			this.getBannerBase(), that.getBannerBase(),
+			this.getBannerPatterns(), that.getBannerPatterns(),
+			this.getPotion(), that.getPotion()
+		);
+	}
+	
+	public boolean isSimilarItem(ItemStack item)
+	{
+		if (item == null) return false;
+		DataItemStack that = DataItemStack.fromBukkit(item);
+		return this.isSimilar(that);
+	}
+	
 	@Override
 	public int hashCode()
 	{

src/com/massivecraft/massivecore/util/InventoryUtil.java

@@ -583,21 +583,28 @@ public class InventoryUtil
 		TAKE,
 		NONE,
 		BOTH,
-		
 		;
 		
 		public boolean isAltering()
 		{
 			return this != NONE;
 		}
+		
 		public boolean isGiving()
 		{
 			return this == GIVE || this == BOTH;
 		}
+		
 		public boolean isTaking()
 		{
 			return this == TAKE || this == BOTH;
 		}
+		
+		public boolean isNone()
+		{
+			return this == NONE;
+		}
+		
 	}
 	
 	/**