Paper/Spigot-Server-Patches/0284-Add-SentientNPC-Interface-to-Entities.patch

From 30f3ac826503f83cca607b290996357ebd24e6a1 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 1 Jul 2018 22:06:29 -0400
Subject: [PATCH] Add SentientNPC Interface to Entities

Used to determine ACTUAL Living NPC's. Spigot mistakenly inversed the conditions for LivingEntity, and
used LivingEntity for Insentient Entities, and named the actual EntityLiving class EntityInsentient.

This should of all been inversed on the implementation side. To make matters worse, Spigot never
exposed the differentiator that there are entities with AI that are not sentient/alive such as
Armor stands and Players are the only things that do not implement the REAL EntityLiving class (named Insentient internally)

This interface lets you identify NPC entities capable of sentience, and able to move about and react to the world.

diff --git a/src/main/java/com/destroystokyo/paper/entity/CraftSentientNPC.java b/src/main/java/com/destroystokyo/paper/entity/CraftSentientNPC.java
new file mode 100644
index 0000000000..a60ba13495
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/entity/CraftSentientNPC.java
@@ -0,0 +1,25 @@
+package com.destroystokyo.paper.entity;
+
+import net.minecraft.server.EntityInsentient;
+import org.bukkit.craftbukkit.entity.CraftLivingEntity;
+import org.bukkit.entity.LivingEntity;
+
+public interface CraftSentientNPC <T extends EntityInsentient> extends SentientNPC {
+    T getHandle();
+
+    default public void setTarget(LivingEntity target) {
+        T entity = getHandle();
+        if (target == null) {
+            entity.setGoalTarget(null, null, false);
+        } else if (target instanceof CraftLivingEntity) {
+            entity.setGoalTarget(((CraftLivingEntity) target).getHandle(), null, false);
+        }
+    }
+
+    default public LivingEntity getTarget() {
+        if (getHandle().getGoalTarget() == null) return null;
+
+        return (CraftLivingEntity) getHandle().getGoalTarget().getBukkitEntity();
+    }
+
+}
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftAmbient.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftAmbient.java
index 086980e76d..ccce080ab8 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftAmbient.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftAmbient.java
@@ -1,11 +1,12 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.destroystokyo.paper.entity.CraftSentientNPC;
 import net.minecraft.server.EntityAmbient;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.Ambient;
 import org.bukkit.entity.EntityType;
 
-public class CraftAmbient extends CraftLivingEntity implements Ambient {
+public class CraftAmbient extends CraftLivingEntity implements Ambient, CraftSentientNPC { // Paper
     public CraftAmbient(CraftServer server, EntityAmbient entity) {
         super(server, entity);
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftComplexLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftComplexLivingEntity.java
index cc115cc368..3a4e6f0c7e 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftComplexLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftComplexLivingEntity.java
@@ -1,17 +1,19 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.destroystokyo.paper.entity.CraftSentientNPC;
+import net.minecraft.server.EntityInsentient;
 import net.minecraft.server.EntityLiving;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.ComplexLivingEntity;
 
-public abstract class CraftComplexLivingEntity extends CraftLivingEntity implements ComplexLivingEntity {
+public abstract class CraftComplexLivingEntity extends CraftLivingEntity implements ComplexLivingEntity, CraftSentientNPC { // Paper
     public CraftComplexLivingEntity(CraftServer server, EntityLiving entity) {
         super(server, entity);
     }
 
     @Override
-    public EntityLiving getHandle() {
-        return (EntityLiving) entity;
+    public EntityInsentient getHandle() { // Paper
+        return (EntityInsentient) entity; // Paper
     }
 
     @Override
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftCreature.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftCreature.java
index 09d42141fb..30004e5e8c 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftCreature.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftCreature.java
@@ -1,16 +1,18 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.destroystokyo.paper.entity.CraftSentientNPC;
 import net.minecraft.server.EntityCreature;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.Creature;
 import org.bukkit.entity.LivingEntity;
 
-public class CraftCreature extends CraftLivingEntity implements Creature {
+public class CraftCreature extends CraftLivingEntity implements Creature, CraftSentientNPC { // Paper
     public CraftCreature(CraftServer server, EntityCreature entity) {
         super(server, entity);
     }
 
-    public void setTarget(LivingEntity target) {
+    // Paper start - move down to SentientNPC
+    /*public void setTarget(LivingEntity target) {
         EntityCreature entity = getHandle();
         if (target == null) {
             entity.setGoalTarget(null, null, false);
@@ -23,7 +25,8 @@ public class CraftCreature extends CraftLivingEntity implements Creature {
         if (getHandle().getGoalTarget() == null) return null;
 
         return (CraftLivingEntity) getHandle().getGoalTarget().getBukkitEntity();
-    }
+    }*/
+    // Paper end
 
     @Override
     public EntityCreature getHandle() {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftFlying.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftFlying.java
index f374c7b880..9e6f523bf1 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftFlying.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftFlying.java
@@ -1,10 +1,11 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.destroystokyo.paper.entity.CraftSentientNPC;
 import net.minecraft.server.EntityFlying;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.Flying;
 
-public class CraftFlying extends CraftLivingEntity implements Flying {
+public class CraftFlying extends CraftLivingEntity implements Flying, CraftSentientNPC { // Paper
 
     public CraftFlying(CraftServer server, EntityFlying entity) {
         super(server, entity);
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftSlime.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftSlime.java
index 6bf30c834c..3768b9573a 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftSlime.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftSlime.java
@@ -1,5 +1,6 @@
 package org.bukkit.craftbukkit.entity;
 
+import com.destroystokyo.paper.entity.CraftSentientNPC;
 import net.minecraft.server.EntitySlime;
 
 import org.bukkit.craftbukkit.CraftServer;
@@ -7,7 +8,7 @@ import org.bukkit.entity.EntityType;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Slime;
 
-public class CraftSlime extends CraftLivingEntity implements Slime {
+public class CraftSlime extends CraftLivingEntity implements Slime, CraftSentientNPC { // Paper
 
     public CraftSlime(CraftServer server, EntitySlime entity) {
         super(server, entity);
-- 
2.18.0