/**
* Sets email for a user.
*
* @param User $user
* @param string $email
*
* @throws InvalidArgumentException if email is not valid or already exists.
* @throws RuntimeException if email already exists.
*/
private function doSetEmail(User $user, $email)
{
if (null !== $email && false === (bool) \Swift_Validate::email($email)) {
throw new InvalidArgumentException(sprintf('Email %s is not legal.', $email));
}
if (null !== $this->repository->findByEmail($email)) {
throw new RuntimeException(sprintf('User with email %s already exists.', $email));
}
$user->setEmail($email);
}