/**
* {@inheritdoc}
*/
public function validate($items, Constraint $constraint)
{
/** @var \Drupal\Core\Field\FieldItemListInterface $items */
/** @var \Drupal\user\UserInterface $account */
$account = $this->context->getMetadata()->getTypedData()->getEntity();
$existing_value = NULL;
if ($account->id()) {
$account_unchanged = \Drupal::entityManager()->getStorage('user')->loadUnchanged($account->id());
$existing_value = $account_unchanged->getEmail();
}
$required = !(!$existing_value && \Drupal::currentUser()->hasPermission('administer users'));
if ($required && (!isset($items) || $items->isEmpty())) {
$this->context->addViolation($this->message, array('!name' => SafeMarkup::placeholder($account->getFieldDefinition('mail')->getLabel())));
}
}
