From 62e1fb3688dae02d102156b8f7f7f38814bb9a74 Mon Sep 17 00:00:00 2001
From: Thanos paravantis <thanosparavantis@gmail.com>
Date: Sat, 9 Jan 2016 17:01:57 +0200
Subject: [PATCH] Prevent players from stacking others with a menu inventory
 opened.

---
 .../mineplex/hub/modules/StackerManager.java  | 42 +++++++++++++++++--
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/Plugins/Mineplex.Hub/src/mineplex/hub/modules/StackerManager.java b/Plugins/Mineplex.Hub/src/mineplex/hub/modules/StackerManager.java
index 420a01dea..3fcf8a8b2 100644
--- a/Plugins/Mineplex.Hub/src/mineplex/hub/modules/StackerManager.java
+++ b/Plugins/Mineplex.Hub/src/mineplex/hub/modules/StackerManager.java
@@ -1,5 +1,6 @@
 package mineplex.hub.modules;
 
+import java.util.ArrayList;
 import java.util.HashSet;
 
 import org.bukkit.Bukkit;
@@ -7,6 +8,7 @@ import org.bukkit.GameMode;
 import org.bukkit.Material;
 import org.bukkit.Sound;
 import org.bukkit.block.Block;
+import org.bukkit.craftbukkit.v1_8_R3.inventory.CraftInventoryCrafting;
 import org.bukkit.entity.EnderDragon;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Horse;
@@ -16,6 +18,8 @@ import org.bukkit.entity.Wither;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.player.PlayerInteractAtEntityEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
 import org.bukkit.util.Vector;
 
 import mineplex.core.MiniPlugin;
@@ -123,24 +127,45 @@ public class StackerManager extends MiniPlugin implements IThrown
 
 		if (stackee instanceof Player)
 		{
+			Player stackeePlayer = (Player) stackee;
+			
 			if (!Manager.hasPlayerStackingEnabled(stacker))
 			{
 				UtilPlayer.message(stacker, F.main("Stacker", "You have player stacking disabled."));
 				return;
 			}
 			
-			if (!Manager.hasPlayerStackingEnabled(((Player)stackee)))
+			if (!Manager.hasPlayerStackingEnabled((stackeePlayer)))
 			{
 				UtilPlayer.message(stacker, F.main("Stacker", F.name(UtilEnt.getName(stackee)) + " has player stacking disabled."));
 				return;
 			}
 
-			if (Manager.GetTreasure().isOpening((Player) stackee))
+			if (Manager.GetTreasure().isOpening(stackeePlayer))
 			{
 				UtilPlayer.message(stacker, F.main("Stacker", F.main("Stacker", F.name(UtilEnt.getName(stackee)) + " is opening a chest!")));
 				return;
 			}
-		}		
+			
+			Inventory top = stackeePlayer.getOpenInventory().getTopInventory();
+
+			if (!(top instanceof CraftInventoryCrafting) && hasItems(top))
+			{
+				String message = F.main("Stacker", F.name(UtilEnt.getName(stackee)) + " cannot be stacked right now.");
+				
+				if (top.getHolder() != null)
+				{
+					if (top.getHolder().equals(stackeePlayer))
+					{
+						UtilPlayer.message(stacker, message);
+						return;
+					}
+				}
+				
+				UtilPlayer.message(stacker, message);
+				return;
+			}
+		}
 		
 		if (stackee instanceof LivingEntity)
 		{
@@ -284,6 +309,17 @@ public class StackerManager extends MiniPlugin implements IThrown
 		//Portal Delay
 		Manager.SetPortalDelay(target);
 	}
+	
+	private boolean hasItems(Inventory inventory)
+	{		
+		for (ItemStack item : inventory.getContents())
+		{
+			if (item != null)
+				return true;
+		}
+		
+		return false;
+	}
 
 	@Override
 	public void Idle(ProjectileUser data)