Move Aikar's EAR 1 into EAR 2 patch

paper-server/src/main/java/io/papermc/paper/entity/activation/ActivationType.java

@@ -0,0 +1,47 @@
+package io.papermc.paper.entity.activation;
+
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.FlyingMob;
+import net.minecraft.world.entity.PathfinderMob;
+import net.minecraft.world.entity.ambient.AmbientCreature;
+import net.minecraft.world.entity.animal.WaterAnimal;
+import net.minecraft.world.entity.monster.Enemy;
+import net.minecraft.world.entity.npc.Villager;
+import net.minecraft.world.entity.raid.Raider;
+import net.minecraft.world.phys.AABB;
+
+public enum ActivationType {
+    WATER,
+    FLYING_MONSTER,
+    VILLAGER,
+    MONSTER,
+    ANIMAL,
+    RAIDER,
+    MISC;
+
+    AABB boundingBox = new AABB(0, 0, 0, 0, 0, 0);
+
+    /**
+     * Returns the activation type for the given entity.
+     *
+     * @param entity entity to get the activation type for
+     * @return activation type
+     */
+    public static ActivationType activationTypeFor(final Entity entity) {
+        if (entity instanceof WaterAnimal) {
+            return ActivationType.WATER;
+        } else if (entity instanceof Villager) {
+            return ActivationType.VILLAGER;
+        } else if (entity instanceof FlyingMob && entity instanceof Enemy) {
+            return ActivationType.FLYING_MONSTER;
+        } else if (entity instanceof Raider) {
+            return ActivationType.RAIDER;
+        } else if (entity instanceof Enemy) {
+            return ActivationType.MONSTER;
+        } else if (entity instanceof PathfinderMob || entity instanceof AmbientCreature) {
+            return ActivationType.ANIMAL;
+        } else {
+            return ActivationType.MISC;
+        }
+    }
+}