DeadBushDecorator.java

package net.glowstone.generator.decorators.overworld;

import net.glowstone.generator.decorators.BlockDecorator;
import org.bukkit.Chunk;
import org.bukkit.GrassSpecies;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.block.BlockState;
import org.bukkit.material.LongGrass;

import java.util.Random;

public class DeadBushDecorator extends BlockDecorator {

    private static final Material[] SOIL_TYPES = {Material.SAND, Material.DIRT, Material.HARD_CLAY, Material.STAINED_CLAY};

    @Override
    public void decorate(World world, Random random, Chunk source) {
        int sourceX = (source.getX() << 4) + random.nextInt(16);
        int sourceZ = (source.getZ() << 4) + random.nextInt(16);
        int sourceY = random.nextInt(world.getHighestBlockYAt(sourceX, sourceZ) << 1);
        while ((world.getBlockAt(sourceX, sourceY, sourceZ).isEmpty() ||
                world.getBlockAt(sourceX, sourceY, sourceZ).getType() == Material.LEAVES) &&
                sourceY > 0) {
            sourceY--;
        }

        for (int i = 0; i < 4; i++) {
            int x = sourceX + random.nextInt(8) - random.nextInt(8);
            int z = sourceZ + random.nextInt(8) - random.nextInt(8);
            int y = sourceY + random.nextInt(4) - random.nextInt(4);

            if (world.getBlockAt(x, y, z).isEmpty()) {
                final Block blockBelow = world.getBlockAt(x, y - 1, z);
                for (Material soil : SOIL_TYPES) {
                    if (soil == blockBelow.getType()) {
                        final BlockState state = world.getBlockAt(x, y, z).getState();
                        state.setType(Material.DEAD_BUSH);
                        state.setData(new LongGrass(GrassSpecies.DEAD));
                        state.update(true);
                        break;
                    }
                }
            }
        }
    }
}