protected function _findPath($path)
    {
        $path = $this->_unifyPath($path);
        $dirs = $this->_dirs;

        $file = null;

        foreach ($dirs as $dir) {
            if (is_readable(realpath($dir.DS.$path))) {
                $file = $dir.DS.$path;
                break;
            }
        }

        return $file;
    }