/**
  *  get Sample_UrlHandler class instance.
  *
  *  @access public
  */
 public static function getInstance($class_name = null)
 {
     $instance = parent::getInstance(__CLASS__);
     return $instance;
 }
 /**
  *  get Capt_UrlHandler class instance.
  *
  *  @access public
  */
 function &getInstance($class_name = null)
 {
     $instance =& parent::getInstance(__CLASS__);
     return $instance;
 }