Update Signs Source!!!

Hey i have found a method to update signs !
for example SurvivalGames signs or other things!
and sorry for my english

Code:

import cn.nukkit.blockentity.BlockEntitySign;
import cn.nukkit.level.Level;
import cn.nukkit.math.Vector3;
import cn.nukkit.scheduler.PluginTask;
import de.lucgameshd.gungame.GunGame;
public class SignUpdate extends PluginTask<GunGame> {
GunGame pl;
Level level;

[pre][code]public SignUpdate(GunGame owner, Level level) {
    super(owner);
    this.owner = pl;
    this.level = level;
}

@Override
public void onRun(int arg0) {
if(level instanceof Level){
    int players = level.getPlayers().size();

    if(level.getBlockEntity(new Vector3(142, 70, 131)) instanceof BlockEntitySign){
        BlockEntitySign s = (BlockEntitySign) level.getBlockEntity(new Vector3(142, 70, 131));
        if(s.getText()[0].equalsIgnoreCase("[GunGame]")){
            s.setText("[GunGame]", players + "/25");
        }
    }

}

}

[/pre]
}
[/code]