public function setFormat($format)
    {
        switch ($format) {
            case self::FORMAT_BASE32:
                $this->encoder = new Base32Encoder();
                break;
            case self::FORMAT_HEX:
                $this->encoder = new HexEncoder();
                break;
            case self::FORMAT_RAW:
            default:
                $this->encoder = new RawEncoder();
        }

        return $this;
    }