test plugin for redstone command block

TestCommandBlockRedstonePlugin.java

package com.tehbeard.test;

import org.bukkit.block.CommandBlock;
import org.bukkit.command.BlockCommandSender;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;

public class TestCommandBlockRedstonePlugin extends JavaPlugin {

	@Override
	public boolean onCommand(CommandSender sender, Command command,
			String label, String[] args) {
		if(sender instanceof BlockCommandSender){

			CommandBlock cb = (CommandBlock) ((BlockCommandSender)sender).getBlock().getState();
			int level = Integer.parseInt(args[0]);
			cb.setRedstoneLevel(level);
			cb.update(true);

			return true;
		}
		return false;
	}
}