class LangcodeRequiredIfTranslatableValuesConstraintValidator

final class LangcodeRequiredIfTranslatableValuesConstraintValidator extends ConstraintValidator {
  
  /**
   * {@inheritdoc}
   */
  public function validate(mixed $value, Constraint $constraint) : void {
    assert($constraint instanceof LangcodeRequiredIfTranslatableValuesConstraint);
    $mapping = $this->context
      ->getObject();
    assert($mapping instanceof Mapping);
    $root = $this->context
      ->getRoot();
    if ($mapping !== $root) {
      throw new LogicException(sprintf('The LangcodeRequiredIfTranslatableValues constraint is applied to \'%s\'. This constraint can only operate on the root object being validated.', $root->getName() . '::' . $mapping->getName()));
    }
    assert(in_array('langcode', $mapping->getValidKeys(), TRUE));
    $is_translatable = $mapping->hasTranslatableElements();
    $is_config_entity = \Drupal::service('config.manager')->getEntityTypeIdByName($mapping->getName()) !== NULL;
    // Require a langcode for translatable configuration and for config
    // entities. Configuration entities that currently do not have translatable
    // elements but do not have a langcode key are not valid because they may
    // receive translatable elements later outside of the entity's control,
    // eg. third party settings.
    if (($is_translatable || $is_config_entity) && !array_key_exists('langcode', $value)) {
      $this->context
        ->buildViolation($is_config_entity ? $constraint->entityMessage : $constraint->missingMessage)
        ->setParameter('@name', $mapping->getName())
        ->addViolation();
      return;
    }
    if (!$is_translatable && array_key_exists('langcode', $value)) {
      // @todo Convert this deprecation to an actual validation error in
      //   https://www.drupal.org/project/drupal/issues/3440238.
      // phpcs:ignore
      @trigger_error(str_replace('@name', $mapping->getName(), $constraint->superfluousMessage), E_USER_DEPRECATED);
    }
  }

}