class UsersFormMapper extends Nette\Object
{
    private static $map = array(
        'name' => 'username',
        // ...
    );


    public function __construct(Nette\Application\UI\Form $form);


    public function save($entity)
    {
        foreach (self::$map as $f => $e) {
            if (isset($this->form[$f])) {
                $this->form[$f]->setDefaultValue($entity->{$e});
            }
        }
    }


    public function load()
    {
        foreach (self::$map as $f => $e) {
            if (isset($this->form[$f])) {
                $entity->{$e} = $this->form[$f];
            }
        }
    }

}