class Zession{
  XMLElement xmlsession;
  XMLElement[] zongs;
  Zong zong;

  String name;
  String file;

  boolean sessionloaded = false;

  Zession(String $1){
    file = $1;
    loadSession();
  }
  void loadSession(){
    try{
      xmlsession = new XMLElement(p, file);
      name = xmlsession.getStringAttribute("name");
      zongs = xmlsession.getChildren();
      sessionloaded = true;
      println("Session "+name+" loaded");
    }
    catch(Exception ide){
      println("File does not exist");
      sessionloaded = false;
    }
  }
  void loadSong(int $1){
    if(sessionloaded){
      if($1<zongs.length){
        zong = new XMLZong(zongs[$1].getStringAttribute("file"));
      }    
      else if($1==zongs.length){
        zong = new FlowRZong();
      }
      else if($1==zongs.length+1){
        zong = new SheLost();
      }
      else{
        println("no song available with index = "+$1);
      }
    }
    else{
      println("you must load a session first");
    }
  }
  void draw(){
    try{
      if(sessionloaded)zong.draw();
    }
    catch(Exception e){
      //println("you're not ready to draw");
    }    
  }
  void rock(){
    try{
      if(sessionloaded)zong.rock();
    }
    catch(Exception e){
      println("you're not ready to rock");
    }
  }
  void checksong(){
    try{
      if(sessionloaded)zong.checksong();
    }
    catch(Exception e){
    }
  }
}