class RecipeConfigInstaller

final class RecipeConfigInstaller extends ConfigInstaller {
  
  /**
   * {@inheritdoc}
   */
  public function installRecipeConfig(ConfigConfigurator $recipe_config) : void {
    $storage = $recipe_config->getConfigStorage();
    // Build the list of new configuration to create.
    $list = array_diff($storage->listAll(), $this->getActiveStorages()
      ->listAll());
    // If there is nothing to do.
    if (empty($list)) {
      return;
    }
    $config_to_create = $storage->readMultiple($list);
    // Sort $config_to_create in the order of the least dependent first.
    $dependency_manager = new ConfigDependencyManager();
    $dependency_manager->setData($config_to_create);
    $config_to_create = array_merge(array_flip($dependency_manager->sortAll()), $config_to_create);
    // Create the optional configuration if there is any left after filtering.
    if (!empty($config_to_create)) {
      $this->createConfiguration(StorageInterface::DEFAULT_COLLECTION, $config_to_create);
    }
    // Validation during the installer is hard. For example:
    // Drupal\ckeditor5\Plugin\Validation\Constraint\EnabledConfigurablePluginsConstraintValidator
    // ends up calling _ckeditor5_theme_css() via
    // Drupal\ckeditor5\Plugin\CKEditor5PluginDefinition->validateDrupalAspects()
    // and this expects the theme system to be set up correctly but we're in the
    // installer so this cannot happen.
    // @todo https://www.drupal.org/i/3443603 consider adding a validation step
    //   for recipes to the installer via install_tasks().
    if (InstallerKernel::installationAttempted()) {
      return;
    }
    foreach (array_keys($config_to_create) as $name) {
      // All config objects are mappings.
      /** @var \Drupal\Core\Config\Schema\Mapping $typed_config */
      $typed_config = $this->typedConfig
        ->createFromNameAndData($name, $this->configFactory
        ->get($name)
        ->getRawData());
      foreach ($typed_config->getConstraints() as $constraint) {
        // Only validate the config if it has explicitly been marked as being
        // validatable.
        if ($constraint instanceof FullyValidatableConstraint) {
          /** @var \Symfony\Component\Validator\ConstraintViolationList $violations */
          $violations = $typed_config->validate();
          if (count($violations) > 0) {
            throw new InvalidConfigException($violations, $typed_config);
          }
          break;

        }
      }
    }
  }

}