<?php

declare(strict_types=1);

namespace Drupal\{{ machine_name }}\Plugin\Validation\Constraint;

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

/**
 * Provides {{ plugin_label|article }} constraint.
{% if input_type == 'entity' %}
 *
 * @see https://www.drupal.org/node/2015723.
{% elseif input_type == 'item_list' %}
 *
 * @DCG
 * To apply this constraint on third party entity types implement either
 * hook_entity_base_field_info_alter() or hook_entity_bundle_field_info_alter().
 *
 * @see https://www.drupal.org/node/2015723
{% elseif input_type == 'item' %}
 *
 * @DCG
 * To apply this constraint on third party field types. Implement
 * hook_field_info_alter() as follows.
 * @code
 * function {{ machine_name }}_field_info_alter(array &$info): void {
 *   $info['FIELD_TYPE']['constraints']['{{ plugin_id }}'] = [];
 * }
 * @endcode
 *
 * @see https://www.drupal.org/node/2015723
{% endif %}
 */
#[Constraint(
  id: '{{ plugin_id }}',
  label: new TranslatableMarkup('{{ plugin_label }}', options: ['context' => 'Validation'])
)]
final class {{ class }} extends SymfonyConstraint {

  public string $message = '@todo Specify error message here.';

}