code: private static function init($type)
      {
          if (!isset(self::$handler[$type])) {
              $class                = '\\org\\transform\\driver\\' . ucwords($type);
              self::$handler[$type] = new $class();
          }
      }
docs: 初始化解析驱动
  @static
  @access private
  @param  string $type 驱动类型