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path: root/nms-patches/ItemMonsterEgg.patch
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--- ../work/decompile-8eb82bde/net/minecraft/server/ItemMonsterEgg.java	2014-12-15 13:53:30.086979118 +0000
+++ src/main/java/net/minecraft/server/ItemMonsterEgg.java	2014-12-15 13:53:30.086979118 +0000
@@ -19,7 +19,8 @@
     }
 
     public boolean interactWith(ItemStack itemstack, EntityHuman entityhuman, World world, BlockPosition blockposition, EnumDirection enumdirection, float f, float f1, float f2) {
-        if (world.isStatic) {
+        // CraftBukkit - check ItemStack data
+        if (world.isStatic || itemstack.getData() == 48 || itemstack.getData() == 49 || itemstack.getData() == 63 || itemstack.getData() == 64) {
             return true;
         } else if (!entityhuman.a(blockposition.shift(enumdirection), enumdirection, itemstack)) {
             return false;
@@ -109,6 +110,12 @@
     }
 
     public static Entity a(World world, int i, double d0, double d1, double d2) {
+        // CraftBukkit start - delegate to spawnCreature
+        return spawnCreature(world, i, d0, d1, d2, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.SPAWNER_EGG);
+    }
+
+    public static Entity spawnCreature(World world, int i, double d0, double d1, double d2, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason spawnReason) {
+        // CraftBukkit end
         if (!EntityTypes.eggInfo.containsKey(Integer.valueOf(i))) {
             return null;
         } else {
@@ -123,8 +130,13 @@
                     entityinsentient.aI = entityinsentient.yaw;
                     entityinsentient.aG = entityinsentient.yaw;
                     entityinsentient.prepare(world.E(new BlockPosition(entityinsentient)), (GroupDataEntity) null);
-                    world.addEntity(entity);
-                    entityinsentient.x();
+                    // CraftBukkit start - don't return an entity when CreatureSpawnEvent is canceled
+                    if (!world.addEntity(entity, spawnReason)) {
+                        entity = null;
+                    } else {
+                        entityinsentient.x();
+                    }
+                    // CraftBukkit end
                 }
             }