AtLeastOneOfConstraint.php

<?php

namespace Drupal\Core\Validation\Plugin\Validation\Constraint;

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Drupal\Core\Validation\CompositeConstraintInterface;
use Symfony\Component\Validator\Constraints\AtLeastOneOf;
use Symfony\Component\Validator\Constraints\AtLeastOneOfValidator;

/**
 * Checks that at least one of the given constraint is satisfied.
 *
 * Overrides the symfony constraint to convert the array of constraints to array
 * of constraint objects and use them.
 */
class AtLeastOneOfConstraint extends AtLeastOneOf implements CompositeConstraintInterface {
  
  /**
   * {@inheritdoc}
   */
  public static function getCompositeOptionStatic() : string {
    return 'constraints';
  }
  
  /**
   * {@inheritdoc}
   */
  public function validatedBy() : string {
    return AtLeastOneOfValidator::class;
  }

}