public class  CommMessage
{
  public CommListener parent;
  
  public void set(CommListener parent)
    {
      this.parent = parent;
    }
 
  public void start()
    {
     if(parent != null){
       parent.start();
     }
    }
  public void end()
    {
      if(parent !=null){
        parent.end();
      }
    }
  
  public void output(Message m)
    {
      if(parent !=null){
        parent.output(m);
      }
    }
  
  public void input(Message m)
    {
      if(parent !=null){
        parent.input(m);
      }
    }


}