Added entity.playEffect, thanks to main-- in an (unfortunately old) PR.

By: Nathan Adams <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/EntityEffect.java

@@ -0,0 +1,54 @@
+package org.bukkit;
+
+/**
+ * A list of all Effects that can happen to entities.
+ */
+public enum EntityEffect {
+	
+	/**
+	 * When mobs get hurt.
+	 */
+	HURT((byte) 2),
+	
+	/**
+	 * When a mob dies.
+	 * <p>
+	 * <b>This will cause client-glitches!
+	 */
+	DEATH((byte) 3),
+	
+	/**
+	 * The smoke when taming a wolf fails.
+	 * <p>
+	 * Without client-mods this will be ignored if the entity is not a wolf.
+	 */
+	WOLF_SMOKE((byte) 6),
+	
+	/**
+	 * The hearts when taming a wolf succeeds.
+	 * <p>
+	 * Without client-mods this will be ignored if the entity is not a wolf.
+	 */
+	WOLF_HEARTS((byte) 7),
+	
+	/**
+	 * When a wolf shakes (after being wet).
+	 * <p>
+	 * Without client-mods this will be ignored if the entity is not a wolf.
+	 */
+	WOLF_SHAKE((byte) 8);
+
+	private final byte data;
+
+	EntityEffect(byte data)
+	{
+		this.data = data;
+	}
+
+	/**
+	 * @return The data-value that is sent to the client to play this effect.
+	 */
+	public byte getData() {
+		return data;
+	}
+}

paper-api/src/main/java/org/bukkit/entity/Entity.java

@@ -1,6 +1,7 @@
 package org.bukkit.entity;
 
 import org.bukkit.Location;
+import org.bukkit.EntityEffect;
 import org.bukkit.Server;
 import org.bukkit.World;
 import org.bukkit.event.entity.EntityDamageEvent;
@@ -216,4 +217,13 @@ public interface Entity {
      * @param value Age of entity
      */
     public void setTicksLived(int value);
+
+    /**
+     * Performs the specified {@link EntityEffect} for this entity.
+     * <p>
+     * This will be viewable to all players near the entity.
+     *
+     * @param type Effect to play.
+     */
+    public void playEffect(EntityEffect type);
 }