WaterWorldGen.java

public class WaterWorldGen extends ChunkGenerator {

  private NoiseGenerator generator;

  private NoiseGenerator getGenerator(World world) {
    if (generator == null) {
      generator = new SimplexNoiseGenerator(world);
    }
    return generator;
  }

  private int getHeight(World world, double x, double y, int variance) {
    NoiseGenerator gen = getGenerator(world);
    double result = gen.noise(x, y);
    result *= variance;
    return NoiseGenerator.floor(result);
  }

  @Override
  public ChunkGenerator.ChunkData generateChunkData(World world, Random random, int cx, int cz,
      ChunkGenerator.BiomeGrid biome) {
    // Create the chunk data from method
    ChunkGenerator.ChunkData data = this.createChunkData(world);
    // Loop through each X and Z value
    for (int x = 0; x < 16; x++) {
      for (int z = 0; z < 16; z++) {
        int height = 20;
        // Loop through each Y value in the column
        for (int y = 0; y < height; y++) {
          // Set the block to be stone if more than 5 blocks down from the surface
          if (y == 0) {
            data.setBlock(x, y, z, Material.BEDROCK);
          } else if (y <= 3) {
            data.setBlock(x, y, z, Material.SAND);
          } else {
            data.setBlock(x, y, z, Material.WATER);
          }
        }
      }
    }
    return data;
  }

  @Override
  public List<BlockPopulator> getDefaultPopulators(World world) {
    return new ArrayList<BlockPopulator>();
  }

  @Override
  public Location getFixedSpawnLocation(World world, Random random) {
    // Create random position within 100 blocks of 0,0
    int x = random.nextInt(200) - 100;
    int z = random.nextInt(200) - 100;
    int y = world.getHighestBlockYAt(x, z);
    return new Location(world, x, y, z);
  }

}