From 4cb187dd3ca69fc416f369cd3b369126efd023b4 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 14 Jan 2018 17:01:31 -0500
Subject: [PATCH] PreCreatureSpawnEvent

Adds an event to fire before an Entity is created, so that plugins that need to cancel
CreatureSpawnEvent can do so from this event instead.

Cancelling CreatureSpawnEvent rapidly causes a lot of garbage collection and CPU waste
as it's done after the Entity object has been fully created.

Mob Limiting plugins and blanket "ban this type of monster" plugins should use this event
instead and save a lot of server resources.

See: https://github.com/PaperMC/Paper/issues/917

diff --git a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
index 87fe4775..9d580ea0 100644
--- a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
+++ b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
@@ -1,6 +1,7 @@
 package net.minecraft.server;
 
 import com.google.common.collect.Lists;
+
 import java.util.Iterator;
 import java.util.List;
 import javax.annotation.Nullable;
@@ -87,6 +88,29 @@ public abstract class MobSpawnerAbstract {
                     double d3 = j >= 1 ? nbttaglist.f(0) : (double) blockposition.getX() + (world.random.nextDouble() - world.random.nextDouble()) * (double) this.spawnRange + 0.5D;
                     double d4 = j >= 2 ? nbttaglist.f(1) : (double) (blockposition.getY() + world.random.nextInt(3) - 1);
                     double d5 = j >= 3 ? nbttaglist.f(2) : (double) blockposition.getZ() + (world.random.nextDouble() - world.random.nextDouble()) * (double) this.spawnRange + 0.5D;
+                    // Paper start
+                    if (this.getMobName() == null) {
+                        return;
+                    }
+                    String key = this.getMobName().getKey();
+                    org.bukkit.entity.EntityType type = org.bukkit.entity.EntityType.fromName(key);
+                    if (type != null) {
+                        com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent event;
+                        event = new com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent(
+                                MCUtil.toLocation(world, d3, d4, d5),
+                                type,
+                                org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.SPAWNER
+                        );
+                        if (!event.callEvent()) {
+                            if (event.shouldAbortSpawn()) {
+                                break;
+                            }
+                            continue;
+                        }
+                    } else {
+                        MinecraftServer.LOGGER.warn("Warning, could not find EntityType for " + key + " - Please report this to Paper at https://github.com/PaperMC/Paper/issues");
+                    }
+                    // Paper end
                     Entity entity = ChunkRegionLoader.a(nbttagcompound, world, d3, d4, d5, false);
 
                     if (entity == null) {
diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
index 2cd06382..e217d334 100644
--- a/src/main/java/net/minecraft/server/SpawnerCreature.java
+++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
@@ -184,6 +184,25 @@ public final class SpawnerCreature {
                                                     }
 
                                                     if (worldserver.a(enumcreaturetype, biomebase_biomemeta, (BlockPosition) blockposition_mutableblockposition) && a(EntityPositionTypes.a(biomebase_biomemeta.b), worldserver, blockposition_mutableblockposition)) {
+                                                        // Paper start
+                                                        com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent event;
+                                                        Class<? extends EntityInsentient> cls = biomebase_biomemeta.b;
+                                                        org.bukkit.entity.EntityType type = EntityTypes.clsToTypeMap.get(cls);
+                                                        if (type != null) {
+                                                            event = new com.destroystokyo.paper.event.entity.PreCreatureSpawnEvent(
+                                                                    MCUtil.toLocation(worldserver, blockposition_mutableblockposition),
+                                                                    type, SpawnReason.NATURAL
+                                                            );
+                                                            if (!event.callEvent()) {
+                                                                if (event.shouldAbortSpawn()) {
+                                                                    continue label120;
+                                                                }
+                                                                j1 += l2;
+                                                                ++j4;
+                                                                continue;
+                                                            }
+                                                        }
+                                                        // Paper end
                                                         EntityInsentient entityinsentient;
 
                                                         try {
-- 
2.14.3