0084-Implement-SpawnerPreSpawnEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: mechoriet <kevinworm92@gmail.com>
Date: Mon, 19 Dec 2022 23:48:44 +0100
Subject: [PATCH] Implement SpawnerPreSpawnEvent

Added registered listeners check to avoid alloc if no plugins are
listening.

diff --git a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
index e54f7edbd1d834391f6760ea7b82cf6af4ddf994..c74bd1b944b6628d315a6f5b7b745ccc4133a6be 100644
--- a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
+++ b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
@@ -91,6 +91,15 @@ public abstract class MobSpawnerAbstract {
                 boolean flag = false;
 
                 for (int i = 0; i < this.spawnCount; ++i) {
+                    // PandaSpigot start - SpawnerPreSpawnEvent
+                    if (net.techcable.tacospigot.event.entity.SpawnerPreSpawnEvent.getHandlerList().getRegisteredListeners().length > 0) {
+                        net.techcable.tacospigot.event.entity.SpawnerPreSpawnEvent event = new net.techcable.tacospigot.event.entity.SpawnerPreSpawnEvent(new org.bukkit.Location(this.a().getWorld(), blockposition.getX(), blockposition.getY(), blockposition.getZ()), org.bukkit.entity.EntityType.fromName(this.getMobName()));
+                        if (!event.callEvent()) {
+                            flag = true;
+                            break;
+                        }
+                    }
+                    // PandaSpigot end
                     Entity entity = EntityTypes.createEntityByName(this.getMobName(), this.a());
 
                     if (entity == null) {