public static function factory($name, $filename)
    {
        switch ($name) {
            case 'ZipArchive':
                if (class_exists('ZipArchive', false)) {
                    return new ZipArchive($filename);
                }
                break;

            case 'tar.gz':
                return new Tar($filename, 'gz');

            case 'tar.bz2':
                return new Tar($filename, 'bz2');

            case 'gz':
                if (function_exists('gzopen')) {
                    return new Gzip($filename);
                }
                break;

            case 'PclZip':
            default:
                return new PclZip($filename);
        }

        return new PclZip($filename);
    }