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',
        ];
    }

}