Add StackedItemSpawnEvent

UltimateStacker-API/src/main/java/com/craftaro/ultimatestacker/api/events/entity/StackedItemSpawnEvent.java

@@ -0,0 +1,61 @@
+package com.craftaro.ultimatestacker.api.events.entity;
+
+import com.craftaro.ultimatestacker.api.stack.entity.EntityStack;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * Called before we spawn a stacked items
+ */
+public class StackedItemSpawnEvent extends Event implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private final ItemStack item;
+    private final long amount;
+    private boolean cancelled = false;
+
+    public StackedItemSpawnEvent(ItemStack item, long amount) {
+        this.item = item;
+        this.amount = amount;
+    }
+
+    /**
+     * Get the item that will be spawned
+     *
+     * @return ItemStack
+     */
+    public ItemStack getItem() {
+        return item;
+    }
+
+    /**
+     * Get the amount of items that will be spawned
+     *
+     * @return amount
+     */
+    public long getAmount() {
+        return amount;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean b) {
+        this.cancelled = true;
+    }
+}

UltimateStacker-Plugin/src/main/java/com.craftaro.ultimatestacker/stackable/item/StackedItemManagerImpl.java

@@ -2,6 +2,7 @@ package com.craftaro.ultimatestacker.stackable.item;
 
 import com.craftaro.core.compatibility.ServerVersion;
 import com.craftaro.ultimatestacker.UltimateStacker;
+import com.craftaro.ultimatestacker.api.events.entity.StackedItemSpawnEvent;
 import com.craftaro.ultimatestacker.api.stack.item.ItemMergeCallback;
 import com.craftaro.ultimatestacker.api.stack.item.StackedItem;
 import com.craftaro.ultimatestacker.api.stack.item.StackedItemManager;
@@ -33,6 +34,10 @@ public class StackedItemManagerImpl implements StackedItemManager {
         if (item.getType() == Material.AIR) return null;
         World world = location.getWorld();
         if (world == null) return null;
+        StackedItemSpawnEvent event = new StackedItemSpawnEvent(item, amount);
+        Bukkit.getPluginManager().callEvent(event);
+        if (event.isCancelled()) return null;
+
         Item dropped = world.dropItem(location, item);
         if (dropped.getItemStack().getType() == Material.AIR) return null;
         return new StackedItemImpl(dropped, amount);