Paper/Spigot-API-Patches/0152-PreSpawnerSpawnEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Phoenix616 <mail@moep.tv>
Date: Tue, 18 Sep 2018 23:50:10 +0100
Subject: [PATCH] PreSpawnerSpawnEvent

This adds a separate event before an entity is spawned by a spawner
which contains the location of the spawner too similarly to how the
SpawnerSpawnEvent gets called instead of the CreatureSpawnEvent for
spawners.

diff --git a/src/main/java/com/destroystokyo/paper/event/entity/PreSpawnerSpawnEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/PreSpawnerSpawnEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..48cff063594840a07aeaf35513780e28ea019a76
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/entity/PreSpawnerSpawnEvent.java
@@ -0,0 +1,29 @@
+package com.destroystokyo.paper.event.entity;
+
+
+import com.google.common.base.Preconditions;
+import org.bukkit.Location;
+import org.bukkit.entity.EntityType;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Called before an entity is spawned into a world by a spawner.
+ *
+ * This only includes the spawner's location and not the full BlockState snapshot for performance reasons.
+ * If you really need it you have to get the spawner yourself.
+ */
+
+public class PreSpawnerSpawnEvent extends PreCreatureSpawnEvent {
+    @NotNull private final Location spawnerLocation;
+
+    public PreSpawnerSpawnEvent(@NotNull Location location, @NotNull EntityType type, @NotNull Location spawnerLocation) {
+        super(location, type, CreatureSpawnEvent.SpawnReason.SPAWNER);
+        this.spawnerLocation = Preconditions.checkNotNull(spawnerLocation, "Spawner location may not be null");
+    }
+
+    @NotNull
+    public Location getSpawnerLocation() {
+        return spawnerLocation;
+    }
+}