private function handleAddressIdentity(AddressInterface $address, UserInterface $user)
    {
        if (null === $address->getGender()) {
            $address->setGender($user->getGender());
        }
        if (null === $address->getFirstName()) {
            $address->setFirstName($user->getFirstName());
        }
        if (null === $address->getLastName()) {
            $address->setLastName($user->getLastName());
        }
    }