public function isRewindable()
    {
        if (null !== $this->rewindable) {
            return $this->rewindable;
        }

        // workaround for an HHVM bug, should be removed when https://github.com/facebook/hhvm/issues/7281 is fixed
        if ('' === $this->getPath()) {
            return $this->rewindable = false;
        }

        if (false !== $stream = @opendir($this->getPath())) {
            $infos = stream_get_meta_data($stream);
            closedir($stream);

            if ($infos['seekable']) {
                return $this->rewindable = true;
            }
        }

        return $this->rewindable = false;
    }