cloud-8.x-2.0-beta1/modules/cloud_service_providers/aws_cloud/src/Plugin/cloud/server_template/AwsCloudServerTemplatePluginUninstallValidator.php

<?php

namespace Drupal\aws_cloud\Plugin\cloud\server_template;

use Drupal\Core\Entity\ContentEntityTypeInterface;
use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\DependencyInjection\DeprecatedServicePropertyTrait;
use Drupal\Core\Extension\ModuleUninstallValidatorInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;
use Drupal\Core\Url;

/**
 * Validates module uninstall readiness based on existing content entities.
 */
class AwsCloudServerTemplatePluginUninstallValidator implements ModuleUninstallValidatorInterface {

  use StringTranslationTrait;
  use DeprecatedServicePropertyTrait;

  /**
   * {@inheritdoc}
   */
  protected $deprecatedProperties = ['entityManager' => 'entity.manager'];

  /**
   * The entity type manager service.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The entity field manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeBundleInfo
   */
  protected $entityTypeBundleInfo;

  /**
   * The entity field manager.
   *
   * @var \Drupal\Core\Entity\EntityFieldManager
   */
  protected $entityFieldManager;

  /**
   * Constructs a new AwsCloudUninstallValidator.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager service.
   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
   *   The string translation service.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager,
                              TranslationInterface $string_translation) {
    if ($entity_type_manager instanceof EntityManagerInterface) {
      @trigger_error('Passing the entity.manager service to AwsCloudUninstallValidator::__construct() is deprecated in "Drupal 8.7.0" and will be removed before "Drupal 9.0.0". Pass the new dependencies instead. See https://www.drupal.org/node/2549139', E_USER_DEPRECATED);
      $this->entityTypeManager = \Drupal::entityTypeManager();
    }
    else {
      $this->entityTypeManager = $entity_type_manager;
    }

    $this->stringTranslation = $string_translation;
  }

  /**
   * {@inheritdoc}
   */
  public function validate($module) {

    field_purge_batch(10000);

    // First, check if there are entities related to aws_cloud module.
    $entity_types = $this->entityTypeManager->getDefinitions();
    foreach ($entity_types as $entity_type) {
      if ($module == $entity_type->getProvider()
        && $entity_type instanceof ContentEntityTypeInterface
        && $this->entityTypeManager->getStorage($entity_type->id())->hasData()) {

        // If there are still entities related ows_cloud module,
        // return an empty value [] ('no reason') by skipping the
        // cloud_server_template_type.aws_cloud check as shown below.
        return [];
      }
    }

    // Second, if there are no entities related to aws_cloud module, ask a user
    // to delete all cloud_server_template_type.aws_cloud entities.
    $bundle = $this->entityTypeManager->getStorage('cloud_server_template_type')->load('aws_cloud');
    $reasons = [];
    if ($module == 'aws_cloud' && !empty($bundle)) {
      $entity_type = $this->entityTypeManager->getDefinition('cloud_server_template_type');
      $reasons[] = $this->t('There is content for the entity type: @entity_type. <a href=":url">Remove @entity_type_plural</a>.', [
        '@entity_type' => $entity_type->getLabel(),
        '@entity_type_plural' => $entity_type->getPluralLabel(),
        ':url' => Url::fromRoute('system.prepare_modules_entity_uninstall', ['entity_type_id' => $entity_type->id()])->toString(),
      ]);
    }
    return $reasons;
  }

}