const STATUS_PRESENT = 'present';
    const STATUS_INSTALLED = 'installed';

    /**
     * @param string $status
     */
    public function setStatus($status)
    {
        if (!defined('static::SOME_' . strtoupper($status))) {
            throw new Kdyby\InvalidArgumentException('Invalid PackageVersion status "' . $status . '" was given.');
        }

        $this->status = strtolower($status);
    }