ComplexDataConstraint.php

<?php

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

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Symfony\Component\Validator\Constraint as SymfonyConstraint;

/**
 * Complex data constraint.
 *
 * Validates properties of complex data structures.
 */
class ComplexDataConstraint extends SymfonyConstraint {
  
  /**
   * An array of constraints for contained properties, keyed by property name.
   *
   * @var array
   */
  public $properties;
  
  /**
   * {@inheritdoc}
   */
  public function __construct($options = NULL) {
    // Allow skipping the 'properties' key in the options.
    if (is_array($options) && !array_key_exists('properties', $options)) {
      $options = [
        'properties' => $options,
      ];
    }
    parent::__construct($options);
    $constraint_manager = \Drupal::service('validation.constraint');
    // Instantiate constraint objects for array definitions.
    foreach ($this->properties as &$constraints) {
      foreach ($constraints as $id => $options) {
        if (!is_object($options)) {
          $constraints[$id] = $constraint_manager->create($id, $options);
        }
      }
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDefaultOption() : ?string {
    return 'properties';
  }
  
  /**
   * {@inheritdoc}
   */
  public function getRequiredOptions() : array {
    return [
      'properties',
    ];
  }

}