SugarCane.java

package net.glowstone.generator.objects;

import org.bukkit.DirtType;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.block.BlockState;
import org.bukkit.material.Dirt;
import org.bukkit.material.MaterialData;

import java.util.Random;

public class SugarCane {

    private static final BlockFace[] FACES = {BlockFace.NORTH, BlockFace.EAST, BlockFace.SOUTH, BlockFace.WEST};

    public void generate(World world, Random random, int x, int y, int z) {
        if (world.getBlockAt(x, y, z).isEmpty()) {
            Block block = world.getBlockAt(x, y, z).getRelative(BlockFace.DOWN);
            boolean adjacentWater = false;
            for (BlockFace face : FACES) {
                // needs a directly adjacent water block
                if (block.getRelative(face).getType() == Material.STATIONARY_WATER ||
                        block.getRelative(face).getType() == Material.WATER) {
                    adjacentWater = true;
                    break;
                }
            }
            if (adjacentWater) {
                for (int n = 0; n <= random.nextInt(random.nextInt(3) + 1) + 1; n++) {
                    block = world.getBlockAt(x, y + n, z).getRelative(BlockFace.DOWN);
                    if (block.getType() == Material.SUGAR_CANE_BLOCK
                            || block.getType() == Material.GRASS
                            || (block.getType() == Material.DIRT && block.getState().getData() instanceof Dirt
                            && ((Dirt) block.getState().getData()).getType() == DirtType.NORMAL)
                            || block.getType() == Material.SAND) {
                        final Block caneBlock = block.getRelative(BlockFace.UP);
                        if (!caneBlock.isEmpty() && !caneBlock.getRelative(BlockFace.UP).isEmpty()) {
                            return;
                        }
                        final BlockState state = caneBlock.getState();
                        state.setType(Material.SUGAR_CANE_BLOCK);
                        state.setData(new MaterialData(Material.SUGAR_CANE_BLOCK));
                        state.update(true);
                    }
                }
            }
        }
    }
}