Implemented custom chunk generators and block populators

src/main/java/org/bukkit/craftbukkit/generator/CustomChunkGenerator.java

@@ -0,0 +1,73 @@
+package org.bukkit.craftbukkit.generator;
+
+import java.util.List;
+import java.util.Random;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.IChunkProvider;
+import net.minecraft.server.IProgressUpdate;
+import net.minecraft.server.World;
+import net.minecraft.server.WorldServer;
+import org.bukkit.generator.BlockPopulator;
+import org.bukkit.generator.ChunkGenerator;
+
+public class CustomChunkGenerator implements InternalChunkGenerator {
+    private final ChunkGenerator generator;
+    private final WorldServer world;
+    private final long seed;
+    private final Random random;
+
+    public CustomChunkGenerator(World world, long seed, ChunkGenerator generator) {
+        this.world = (WorldServer)world;
+        this.seed = seed;
+        this.generator = generator;
+
+        this.random = new Random(seed);
+    }
+
+    public boolean isChunkLoaded(int x, int z) {
+        return true;
+    }
+
+    public Chunk getOrCreateChunk(int x, int z) {
+        random.setSeed((long)x * 341873128712L + (long)z * 132897987541L);
+        byte[] types = generator.generate(world.getWorld(), random, x, z);
+
+        Chunk chunk = new Chunk(world, types, x, z);
+
+        chunk.b();
+
+        return chunk;
+    }
+
+    public void getChunkAt(IChunkProvider icp, int i, int i1) {
+        // Nothing!
+    }
+
+    public boolean saveChunks(boolean bln, IProgressUpdate ipu) {
+        return true;
+    }
+
+    public boolean unloadChunks() {
+        return false;
+    }
+
+    public boolean b() {
+        return true;
+    }
+
+    public byte[] generate(org.bukkit.World world, Random random, int x, int z) {
+        return generator.generate(world, random, x, z);
+    }
+
+    public Chunk getChunkAt(int x, int z) {
+        return getOrCreateChunk(x, z);
+    }
+
+    public boolean canSpawn(org.bukkit.World world, int x, int z) {
+        return generator.canSpawn(world, x, z);
+    }
+
+    public List<BlockPopulator> getDefaultPopulators(org.bukkit.World world) {
+        return generator.getDefaultPopulators(world);
+    }
+}

src/main/java/org/bukkit/craftbukkit/generator/InternalChunkGenerator.java

@@ -0,0 +1,9 @@
+
+package org.bukkit.craftbukkit.generator;
+
+import net.minecraft.server.IChunkProvider;
+import org.bukkit.generator.ChunkGenerator;
+
+public interface InternalChunkGenerator extends ChunkGenerator, IChunkProvider {
+
+}

src/main/java/org/bukkit/craftbukkit/generator/NetherChunkGenerator.java

@@ -0,0 +1,12 @@
+package org.bukkit.craftbukkit.generator;
+
+import net.minecraft.server.World;
+
+/**
+ * This class is useless. Just fyi.
+ */
+public class NetherChunkGenerator extends NormalChunkGenerator {
+    public NetherChunkGenerator(World world, long seed) {
+        super(world, seed);
+    }
+}

src/main/java/org/bukkit/craftbukkit/generator/NormalChunkGenerator.java

@@ -0,0 +1,27 @@
+package org.bukkit.craftbukkit.generator;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import net.minecraft.server.ChunkProviderGenerate;
+import net.minecraft.server.World;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.generator.BlockPopulator;
+
+public class NormalChunkGenerator extends ChunkProviderGenerate implements InternalChunkGenerator {
+    public NormalChunkGenerator(World world, long seed) {
+        super(world, seed);
+    }
+
+    public byte[] generate(org.bukkit.World world, Random random, int x, int z) {
+        throw new UnsupportedOperationException("Not supported.");
+    }
+
+    public boolean canSpawn(org.bukkit.World world, int x, int z) {
+        return ((CraftWorld)world).getHandle().worldProvider.a(x, z);
+    }
+
+    public List<BlockPopulator> getDefaultPopulators(org.bukkit.World world) {
+        return new ArrayList<BlockPopulator>();
+    }
+}

src/main/java/org/bukkit/craftbukkit/generator/SkyLandsChunkGenerator.java

@@ -0,0 +1,12 @@
+package org.bukkit.craftbukkit.generator;
+
+import net.minecraft.server.World;
+
+/**
+ * This class is useless. Just fyi.
+ */
+public class SkyLandsChunkGenerator extends NormalChunkGenerator {
+    public SkyLandsChunkGenerator(World world, long seed) {
+        super(world, seed);
+    }
+}