PaperMC/Spigot-Server-Patches/0360-Mob-Pathfinding-API.patch

From be254c51040ca6213260aab425d0759e76f03576 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 9 Sep 2018 13:30:00 -0400
Subject: [PATCH] Mob Pathfinding API

Implements Pathfinding API for mobs

diff --git a/src/main/java/com/destroystokyo/paper/entity/PaperPathfinder.java b/src/main/java/com/destroystokyo/paper/entity/PaperPathfinder.java
new file mode 100644
index 0000000000..ed3d86ddd3
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/entity/PaperPathfinder.java
@@ -0,0 +1,113 @@
+package com.destroystokyo.paper.entity;
+
+import net.minecraft.server.EntityInsentient;
+import net.minecraft.server.PathEntity;
+import net.minecraft.server.PathPoint;
+import org.apache.commons.lang.Validate;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.entity.CraftLivingEntity;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Mob;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class PaperPathfinder implements com.destroystokyo.paper.entity.Pathfinder {
+
+    private final EntityInsentient entity;
+
+    public PaperPathfinder(EntityInsentient entity) {
+        this.entity = entity;
+    }
+
+    @Override
+    public Mob getEntity() {
+        return entity.getBukkitMob();
+    }
+
+    @Override
+    public void stopPathfinding() {
+        entity.getNavigation().stopPathfinding();
+    }
+
+    @Override
+    public boolean hasPath() {
+        return entity.getNavigation().getPathEntity() != null;
+    }
+
+    @Nullable
+    @Override
+    public PathResult getCurrentPath() {
+        PathEntity path = entity.getNavigation().getPathEntity();
+        return path != null ? new PaperPathResult(path) : null;
+    }
+
+    @Nullable
+    @Override
+    public PathResult findPath(Location loc) {
+        Validate.notNull(loc, "Location can not be null");
+        PathEntity path = entity.getNavigation().calculateDestination(loc.getX(), loc.getY(), loc.getZ());
+        return path != null ? new PaperPathResult(path) : null;
+    }
+
+    @Nullable
+    @Override
+    public PathResult findPath(LivingEntity target) {
+        Validate.notNull(target, "Target can not be null");
+        PathEntity path = entity.getNavigation().calculateDestination(((CraftLivingEntity) target).getHandle());
+        return path != null ? new PaperPathResult(path) : null;
+    }
+
+    @Override
+    public boolean moveTo(@Nonnull PathResult path, double speed) {
+        Validate.notNull(path, "PathResult can not be null");
+        PathEntity pathEntity = ((PaperPathResult) path).path;
+        return entity.getNavigation().setDestination(pathEntity, speed);
+    }
+
+    public class PaperPathResult implements com.destroystokyo.paper.entity.PaperPathfinder.PathResult {
+
+        private final PathEntity path;
+        PaperPathResult(PathEntity path) {
+            this.path = path;
+        }
+
+        @Nullable
+        @Override
+        public Location getFinalPoint() {
+            PathPoint point = path.getFinalPoint();
+            return point != null ? toLoc(point) : null;
+        }
+
+        @Override
+        public List<Location> getPoints() {
+            int pathCount = path.getPathCount();
+            List<Location> points = new ArrayList<>();
+            PathPoint[] pathPoints = path.getPoints();
+            for (int i = 0; i < pathCount; i++) {
+                points.add(toLoc(pathPoints[i]));
+            }
+            return points;
+        }
+
+        @Override
+        public int getNextPointIndex() {
+            return path.getNextIndex();
+        }
+
+        @Nullable
+        @Override
+        public Location getNextPoint() {
+            if (!path.hasNext()) {
+                return null;
+            }
+            return toLoc(path.getPoints()[path.getNextIndex()]);
+        }
+    }
+
+    private Location toLoc(PathPoint point) {
+        return new Location(entity.world.getWorld(), point.getX(), point.getY(), point.getZ());
+    }
+}
diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
index efdfa7195c..113fd9a50f 100644
--- a/src/main/java/net/minecraft/server/NavigationAbstract.java
+++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
@@ -65,7 +65,7 @@ public abstract class NavigationAbstract {
     }
 
     @Nullable
-    public final PathEntity a(double d0, double d1, double d2) {
+    public final PathEntity calculateDestination(double d0, double d1, double d2) { return a(d0, d1, d2); } @Nullable public final PathEntity a(double d0, double d1, double d2) { // Paper - OBFHELPER
         return this.b(new BlockPosition(d0, d1, d2));
     }
 
@@ -91,7 +91,7 @@ public abstract class NavigationAbstract {
     }
 
     @Nullable
-    public PathEntity a(Entity entity) {
+    public PathEntity calculateDestination(Entity entity) { return a(entity); } @Nullable public PathEntity a(Entity entity) { // Paper - OBFHELPER
         if (!this.b()) {
             return null;
         } else {
@@ -140,6 +140,7 @@ public abstract class NavigationAbstract {
     private int pathfindFailures = 0;
     // Paper end
 
+    public boolean setDestination(@Nullable PathEntity pathentity, double speed) { return a(pathentity, speed); } // Paper - OBFHELPER
     public boolean a(@Nullable PathEntity pathentity, double d0) {
         if (pathentity == null) {
             this.c = null;
@@ -161,8 +162,7 @@ public abstract class NavigationAbstract {
             }
         }
     }
-
-    @Nullable
+    @Nullable public PathEntity getPathEntity() { return m(); } @Nullable // Paper - OBFHELPER
     public PathEntity m() {
         return this.c;
     }
@@ -264,6 +264,7 @@ public abstract class NavigationAbstract {
         return this.c == null || this.c.b();
     }
 
+    public void stopPathfinding() { q(); } // Paper - OBFHELPER
     public void q() {
         this.pathfindFailures = 0; this.lastFailure = 0; // Paper - Pathfinding optimizations
         this.c = null;
diff --git a/src/main/java/net/minecraft/server/PathEntity.java b/src/main/java/net/minecraft/server/PathEntity.java
index 5ffcda6d56..dae08cbbf8 100644
--- a/src/main/java/net/minecraft/server/PathEntity.java
+++ b/src/main/java/net/minecraft/server/PathEntity.java
@@ -3,12 +3,13 @@ package net.minecraft.server;
 import javax.annotation.Nullable;
 
 public class PathEntity {
-    private final PathPoint[] a;
+    private final PathPoint[] a; public PathPoint[] getPoints() { return a; } // Paper - OBFHELPER
     private PathPoint[] b = new PathPoint[0];
     private PathPoint[] c = new PathPoint[0];
     private PathPoint d;
-    private int e;
-    private int f;
+    private int e; public int getNextIndex() { return e; } // Paper - OBFHELPER
+    private int f; public int getPathCount() { return f; } // Paper - OBFHELPER
+    public boolean hasNext() { return getNextIndex() < getPathCount(); } // Paper
 
     public PathEntity(PathPoint[] apathpoint) {
         this.a = apathpoint;
@@ -24,7 +25,7 @@ public class PathEntity {
     }
 
     @Nullable
-    public PathPoint c() {
+    public PathPoint getFinalPoint() { return c(); } @Nullable public PathPoint c() { // Paper - OBFHELPER
         return this.f > 0 ? this.a[this.f - 1] : null;
     }
 
@@ -63,7 +64,7 @@ public class PathEntity {
         return this.a(entity, this.e);
     }
 
-    public Vec3D f() {
+    public Vec3D getNext() { return f(); } public Vec3D f() { // Paper - OBFHELPER
         PathPoint pathpoint = this.a[this.e];
         return new Vec3D((double)pathpoint.a, (double)pathpoint.b, (double)pathpoint.c);
     }
diff --git a/src/main/java/net/minecraft/server/PathPoint.java b/src/main/java/net/minecraft/server/PathPoint.java
index 497f472233..7fd1eff0b5 100644
--- a/src/main/java/net/minecraft/server/PathPoint.java
+++ b/src/main/java/net/minecraft/server/PathPoint.java
@@ -1,9 +1,9 @@
 package net.minecraft.server;
 
 public class PathPoint {
-    public final int a;
-    public final int b;
-    public final int c;
+    public final int a; public final int getX() { return a; } // Paper - OBFHELPER
+    public final int b; public final int getY() { return b; } // Paper - OBFHELPER
+    public final int c; public final int getZ() { return c; } // Paper - OBFHELPER
     private final int n;
     public int d = -1;
     public float e;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
index 5bf1cd06fa..53c2d154ed 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
@@ -12,8 +12,11 @@ import org.bukkit.loot.LootTable;
 public abstract class CraftMob extends CraftLivingEntity implements Mob {
     public CraftMob(CraftServer server, EntityInsentient entity) {
         super(server, entity);
+         paperPathfinder = new com.destroystokyo.paper.entity.PaperPathfinder(entity); // Paper
     }
 
+    private final com.destroystokyo.paper.entity.PaperPathfinder paperPathfinder; // Paper
+    @Override public com.destroystokyo.paper.entity.Pathfinder getPathfinder() { return paperPathfinder; } // Paper
     @Override
     public void setTarget(LivingEntity target) {
         EntityInsentient entity = getHandle();
-- 
2.19.0