class PostMethodProvider extends Nette\Object
{
    const RUSSIA = 1;

    private static $methodClasses = array(
        self::RUSSIA => 'RussiaPostMethod',
        ...
    );

    private $db;

    public function __construct($db)
    {
        $this->db = $db;
    }


    public function get($id)
    {
        $package = $this->db->table('packages')->get($id);
        if (isset(self::$methodClasses[$package->postMethod])) {
            $class = self::$methodClasses[$package->postMethod];
            return new $class($this->db, $package);
        }

        throw new InvalidArgumentException('Unknown post method');
    }
}


interface PostMethod
{
    function getDocuments();
}

class RussiaPostMethod extends Nette\Object implements PostMethod
{
    public function getDocuments()
    {
        // russian folder, create template, fill in, generate PDF. ...

        // nebo muzes jenom vrati nejaky array(soubor, parametry)
        // ktery predas jinemu objektu na zpracovani a vyflusne ti to PDFko
    }
}



////// ......


$postMethodProvider = new PostMethodProvider($db);
$postMethod = $postMethodProvider->get($idZodkazu);

$pdfGenerator = new PdfGenerator(...);
$pdfResponse = $pdfGenerator->generate($postMethod->getDocuments());
$this->sendResponse($pdfResponse);