PaperMC/CraftBukkit-Patches/0026-Implement-SpawnerSpawnEvent.patch

From 19c48ebe81daff5f911758b59f9f733a70985f92 Mon Sep 17 00:00:00 2001
From: Andy Shulman <andy.shulman@hotmail.com>
Date: Mon, 15 Apr 2013 20:06:37 -0500
Subject: [PATCH] Implement SpawnerSpawnEvent.

Adds BUKKIT-267

diff --git a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
index e597d77..4bbd288 100644
--- a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
+++ b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
@@ -4,7 +4,11 @@ import com.google.common.collect.Lists;
 import java.util.Iterator;
 import java.util.List;
 
-import org.bukkit.event.entity.CreatureSpawnEvent; // CraftBukkit
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.bukkit.event.entity.SpawnerSpawnEvent;
+// CraftBukkit end
 
 public abstract class MobSpawnerAbstract {
 
@@ -136,7 +140,12 @@ public abstract class MobSpawnerAbstract {
 
             entity.f(nbttagcompound);
             if (entity.world != null && flag) {
-                entity.world.addEntity(entity, CreatureSpawnEvent.SpawnReason.SPAWNER); // CraftBukkit
+                // CraftBukkit start - call SpawnerSpawnEvent, abort if cancelled
+                SpawnerSpawnEvent event = CraftEventFactory.callSpawnerSpawnEvent(entity, this.b().getX(), this.b().getY(), this.b().getZ());
+                if (!event.isCancelled()) {
+                    entity.world.addEntity(entity, CreatureSpawnEvent.SpawnReason.SPAWNER); // CraftBukkit
+                }
+                // CraftBukkit end
             }
 
             NBTTagCompound nbttagcompound1;
@@ -160,6 +169,11 @@ public abstract class MobSpawnerAbstract {
 
                     entity2.f(nbttagcompound2);
                     entity2.setPositionRotation(entity1.locX, entity1.locY, entity1.locZ, entity1.yaw, entity1.pitch);
+                    // CraftBukkit start - call SpawnerSpawnEvent, skip if cancelled
+                    SpawnerSpawnEvent event = CraftEventFactory.callSpawnerSpawnEvent(entity2, this.b().getX(), this.b().getY(), this.b().getZ());
+                    if (event.isCancelled()) {
+                        continue;
+                    }
                     if (entity.world != null && flag) {
                         entity.world.addEntity(entity2, CreatureSpawnEvent.SpawnReason.SPAWNER); // CraftBukkit
                     }
@@ -171,7 +185,12 @@ public abstract class MobSpawnerAbstract {
             }
         } else if (entity instanceof EntityInsentient && entity.world != null && flag) { // CraftBukkit - EntityLiving -> EntityInsentient
             ((EntityInsentient) entity).prepare(entity.world.E(new BlockPosition(entity)), (GroupDataEntity) null);
-            entity.world.addEntity(entity, CreatureSpawnEvent.SpawnReason.SPAWNER); // CraftBukkit
+            // Spigot start - call SpawnerSpawnEvent, abort if cancelled
+            SpawnerSpawnEvent event = CraftEventFactory.callSpawnerSpawnEvent(entity, this.b().getX(), this.b().getY(), this.b().getZ());
+            if (!event.isCancelled()) {
+                entity.world.addEntity(entity, CreatureSpawnEvent.SpawnReason.SPAWNER); // CraftBukkit
+            }
+            // Spigot end
         }
 
         return entity;
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 60e2a4f..dd0cab1 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -18,6 +18,7 @@ import org.bukkit.Statistic.Type;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
 import org.bukkit.block.BlockState;
+import org.bukkit.block.CreatureSpawner;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.CraftStatistic;
 import org.bukkit.craftbukkit.CraftWorld;
@@ -127,6 +128,22 @@ public class CraftEventFactory {
     }
 
     /**
+     * Mob spawner event
+     */
+    public static SpawnerSpawnEvent callSpawnerSpawnEvent(Entity spawnee, int spawnerX, int spawnerY, int spawnerZ) {
+        org.bukkit.craftbukkit.entity.CraftEntity entity = spawnee.getBukkitEntity();
+        BlockState state = entity.getWorld().getBlockAt(spawnerX, spawnerY, spawnerZ).getState();
+
+        if (!(state instanceof CreatureSpawner)) {
+            state = null;
+        }
+
+        SpawnerSpawnEvent event = new SpawnerSpawnEvent(entity, (CreatureSpawner) state);
+        entity.getServer().getPluginManager().callEvent(event);
+        return event;
+    }
+
+    /**
      * Bucket methods
      */
     public static PlayerBucketEmptyEvent callPlayerBucketEmptyEvent(EntityHuman who, int clickedX, int clickedY, int clickedZ, EnumDirection clickedFace, ItemStack itemInHand) {
-- 
2.1.0