/**
* Sets the login for a user.
*
* @param User $user
* @param sring $login
*
* @throws InvalidArgumentException if login is not valid.
* @throws RuntimeException if login already exists.
*/
private function doSetLogin(User $user, $login)
{
if (null !== $this->repository->findByLogin($login)) {
throw new RuntimeException(sprintf('User with login %s already exists.', $login));
}
$user->setLogin($login);
}
