Add isChunkGenerated API (#1363)

Resolves #1329

Spigot-API-Patches/isChunkGenerated-API.patch

@@ -0,0 +1,67 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: cswhite2000 <18whitechristop@gmail.com>
+Date: Tue, 21 Aug 2018 19:39:46 -0700
+Subject: [PATCH] isChunkGenerated API
+
+Resolves #1329
+
+diff --git a/src/main/java/org/bukkit/Location.java b/src/main/java/org/bukkit/Location.java
+index 7e1ee875..9457832b 100644
+--- a/src/main/java/org/bukkit/Location.java
++++ b/src/main/java/org/bukkit/Location.java
+@@ -0,0 +0,0 @@ import org.bukkit.util.NumberConversions;
+ import org.bukkit.util.Vector;
+ 
+ // Paper start
++import com.google.common.base.Preconditions;
+ import java.util.Collection;
+ import java.util.function.Predicate;
+ import org.bukkit.entity.Entity;
+@@ -0,0 +0,0 @@ public class Location implements Cloneable, ConfigurationSerializable {
+     public boolean isChunkLoaded() { return world.isChunkLoaded(locToBlock(x) >> 4, locToBlock(z) >> 4); } // Paper
+ 
+     // Paper start
++    /**
++     * Checks if a {@link Chunk} has been generated at this location.
++     *
++     * @return true if a chunk has been generated at this location
++     */
++    public boolean isGenerated() {
++        Preconditions.checkNotNull(world, "Location has no world!");
++        return world.isChunkGenerated(locToBlock(x) >> 4, locToBlock(z) >> 4);
++    }
+ 
+     /**
+      * Sets the position of this Location and returns itself
+diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
+index a6facc4b..d5058634 100644
+--- a/src/main/java/org/bukkit/World.java
++++ b/src/main/java/org/bukkit/World.java
+@@ -0,0 +0,0 @@ public interface World extends PluginMessageRecipient, Metadatable {
+     public default Chunk getChunkAt(long chunkKey) {
+         return getChunkAt((int) chunkKey, (int) (chunkKey >> 32));
+     }
++
++    /**
++     * Checks if a {@link Chunk} has been generated at the specified chunk key,
++     * which is the X and Z packed into a long.
++     *
++     * @param chunkKey The Chunk Key to look up the chunk by
++     * @return true if the chunk has been generated, otherwise false
++     */
++    public default boolean isChunkGenerated(long chunkKey) {
++        return isChunkGenerated((int) chunkKey, (int) (chunkKey >> 32));
++    }
++
++    /**
++     * Checks if a {@link Chunk} has been generated at the given coordinates.
++     *
++     * @param x X-coordinate of the chunk
++     * @param z Z-coordinate of the chunk
++     * @return true if the chunk has been generated, otherwise false
++     */
++    public boolean isChunkGenerated(int x, int z);
+     // Paper end
+ 
+     /**
+--

Spigot-Server-Patches/isChunkGenerated-API.patch

@@ -0,0 +1,42 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: cswhite2000 <18whitechristop@gmail.com>
+Date: Tue, 21 Aug 2018 19:44:10 -0700
+Subject: [PATCH] isChunkGenerated API
+
+Resolves #1329
+
+diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
+index 0eba3df5..ad548590 100644
+--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
++++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
+@@ -0,0 +0,0 @@ public class ChunkProviderServer implements IChunkProvider {
+ 
+     }
+ 
++    // Paper start
++    public boolean isChunkGenerated(int x, int z) {
++        return this.chunks.containsKey(ChunkCoordIntPair.asLong(x, z)) || this.chunkLoader.chunkExists(x, z);
++    }
++    // Paper end
++
+     @Nullable
+     public Chunk getLoadedChunkAt(int i, int j) {
+         long k = ChunkCoordIntPair.a(i, j);
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 567e9acb..afb141c6 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -0,0 +0,0 @@ public class CraftWorld implements World {
+         return getChunkAt(location.getBlockX() >> 4, location.getBlockZ() >> 4);
+     }
+ 
++    // Paper start
++    public boolean isChunkGenerated(int x, int z) {
++        return this.getHandle().getChunkProviderServer().isChunkGenerated(x, z);
++    }
++    // Paper end
++
+     public ChunkGenerator getGenerator() {
+         return generator;
+     }
+--