Utility base class for thin controllers.

Controllers that use this base class have access to a number of utility methods and to the Container, which can greatly reduce boilerplate dependency handling code. However, it also makes the class considerably more difficult to unit test. Therefore this base class should only be used by controller classes that contain only trivial glue code. Controllers that contain sufficiently complex logic that it's worth testing should not use this base class but use ContainerInjectionInterface instead, or even better be refactored to be trivial glue code.

The services exposed here are those that it is reasonable for a well-behaved controller to leverage. A controller that needs other services may need to be refactored into a thin controller and a dependent unit-testable service.

Hierarchy

Expanded class hierarchy of ControllerBase

See also

\Drupal\Core\DependencyInjection\ContainerInjectionInterface

Related topics

61 files declare their use of ControllerBase

File

core/lib/Drupal/Core/Controller/ControllerBase.php, line 38
Contains \Drupal\Core\Controller\ControllerBase.

Namespace

Drupal\Core\Controller
View source
abstract class ControllerBase implements ContainerInjectionInterface {

   use  LinkGeneratorTrait;
   use  RedirectDestinationTrait;
   use  StringTranslationTrait;
   use  UrlGeneratorTrait;

  /**
   * The entity manager.
   *
   * @var \Drupal\Core\Entity\EntityManagerInterface
   */
  protected $entityManager;

  /**
   * The entity form builder.
   *
   * @var \Drupal\Core\Entity\EntityFormBuilderInterface
   */
  protected $entityFormBuilder;

  /**
   * The language manager.
   *
   * @var \Drupal\Core\Language\LanguageManagerInterface
   */
  protected $languageManager;

  /**
   * The configuration factory.
   *
   * @var \Drupal\Core\Config\Config
   */
  protected $configFactory;

  /**
   * The key-value storage.
   *
   * @var \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  protected $keyValue;

  /**
   * The current user service.
   *
   * @var \Drupal\Core\Session\AccountInterface
   */
  protected $currentUser;

  /**
   * The state service.
   *
   * @var \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  protected $stateService;

  /**
   * The module handler.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

  /**
   * The form builder.
   *
   * @var \Drupal\Core\Form\FormBuilderInterface
   */
  protected $formBuilder;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static();
  }

  /**
   * Retrieves the entity manager service.
   *
   * @return \Drupal\Core\Entity\EntityManagerInterface
   *   The entity manager service.
   */
  protected function entityManager() {
    if (!$this->entityManager) {
      $this->entityManager = $this->container()->get('entity.manager');
    }
    return $this->entityManager;
  }

  /**
   * Retrieves the entity form builder.
   *
   * @return \Drupal\Core\Entity\EntityFormBuilderInterface
   *   The entity form builder.
   */
  protected function entityFormBuilder() {
    if (!$this->entityFormBuilder) {
      $this->entityFormBuilder = $this->container()->get('entity.form_builder');
    }
    return $this->entityFormBuilder;
  }

  /**
   * Returns the requested cache bin.
   *
   * @param string $bin
   *   (optional) The cache bin for which the cache object should be returned,
   *   defaults to 'default'.
   *
   * @return \Drupal\Core\Cache\CacheBackendInterface
   *   The cache object associated with the specified bin.
   */
  protected function cache($bin = 'default') {
    return $this->container()->get('cache.' . $bin);
  }

  /**
   * Retrieves a configuration object.
   *
   * This is the main entry point to the configuration API. Calling
   * @code $this->config('book.admin') @endcode will return a configuration
   * object in which the book module can store its administrative settings.
   *
   * @param string $name
   *   The name of the configuration object to retrieve. The name corresponds to
   *   a configuration file. For @code \Drupal::config('book.admin') @endcode,
   *   the config object returned will contain the contents of book.admin
   *   configuration file.
   *
   * @return \Drupal\Core\Config\Config
   *   A configuration object.
   */
  protected function config($name) {
    if (!$this->configFactory) {
      $this->configFactory = $this->container()->get('config.factory');
    }
    return $this->configFactory->get($name);
  }

  /**
   * Returns a key/value storage collection.
   *
   * @param string $collection
   *   Name of the key/value collection to return.
   *
   * @return \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  protected function keyValue($collection) {
    if (!$this->keyValue) {
      $this->keyValue = $this->container()->get('keyvalue')->get($collection);
    }
    return $this->keyValue;
  }

  /**
   * Returns the state storage service.
   *
   * Use this to store machine-generated data, local to a specific environment
   * that does not need deploying and does not need human editing; for example,
   * the last time cron was run. Data which needs to be edited by humans and
   * needs to be the same across development, production, etc. environments
   * (for example, the system maintenance message) should use config() instead.
   *
   * @return \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  protected function state() {
    if (!$this->stateService) {
      $this->stateService = $this->container()->get('state');
    }
    return $this->stateService;
  }

  /**
   * Returns the module handler.
   *
   * @return \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected function moduleHandler() {
    if (!$this->moduleHandler) {
      $this->moduleHandler = $this->container()->get('module_handler');
    }
    return $this->moduleHandler;
  }

  /**
   * Returns the form builder service.
   *
   * @return \Drupal\Core\Form\FormBuilderInterface
   */
  protected function formBuilder() {
    if (!$this->formBuilder) {
      $this->formBuilder = $this->container()->get('form_builder');
    }
    return $this->formBuilder;
  }

  /**
   * Returns the current user.
   *
   * @return \Drupal\Core\Session\AccountInterface
   *   The current user.
   */
  protected function currentUser() {
    if (!$this->currentUser) {
      $this->currentUser = $this->container()->get('current_user');
    }
    return $this->currentUser;
  }

  /**
   * Returns the language manager service.
   *
   * @return \Drupal\Core\Language\LanguageManagerInterface
   *   The language manager.
   */
  protected function languageManager() {
    if (!$this->languageManager) {
      $this->languageManager = $this->container()->get('language_manager');
    }
    return $this->languageManager;
  }

  /**
   * Returns the service container.
   *
   * This method is marked private to prevent sub-classes from retrieving
   * services from the container through it. Instead,
   * \Drupal\Core\DependencyInjection\ContainerInjectionInterface should be used
   * for injecting services.
   *
   * @return \Symfony\Component\DependencyInjection\ContainerInterface $container
   *   The service container.
   */
  private function container() {
    return \Drupal::getContainer();
  }

}

Members

Contains filters are case sensitive
Namesort descending Modifiers Type Description
ControllerBase::$configFactory protected property The configuration factory.
ControllerBase::$currentUser protected property The current user service.
ControllerBase::$entityFormBuilder protected property The entity form builder.
ControllerBase::$entityManager protected property The entity manager.
ControllerBase::$formBuilder protected property The form builder.
ControllerBase::$keyValue protected property The key-value storage.
ControllerBase::$languageManager protected property The language manager.
ControllerBase::$moduleHandler protected property The module handler.
ControllerBase::$stateService protected property The state service.
ControllerBase::cache protected function Returns the requested cache bin.
ControllerBase::config protected function Retrieves a configuration object.
ControllerBase::container private function Returns the service container.
ControllerBase::create public static function Instantiates a new instance of this class. Overrides ContainerInjectionInterface::create
ControllerBase::currentUser protected function Returns the current user.
ControllerBase::entityFormBuilder protected function Retrieves the entity form builder.
ControllerBase::entityManager protected function Retrieves the entity manager service.
ControllerBase::formBuilder protected function Returns the form builder service.
ControllerBase::keyValue protected function Returns a key/value storage collection.
ControllerBase::languageManager protected function Returns the language manager service.
ControllerBase::moduleHandler protected function Returns the module handler.
ControllerBase::state protected function Returns the state storage service.
LinkGeneratorTrait::$linkGenerator protected property The link generator.
LinkGeneratorTrait::getLinkGenerator protected function Returns the link generator.
LinkGeneratorTrait::l protected function Renders a link to a route given a route name and its parameters.
LinkGeneratorTrait::setLinkGenerator public function Sets the link generator service.
RedirectDestinationTrait::$redirectDestination protected property The redirect destination service.
RedirectDestinationTrait::getDestinationArray protected function Prepares a 'destination' URL query parameter for use with \Drupal\Core\Url.
RedirectDestinationTrait::getRedirectDestination protected function Returns the redirect destination service.
RedirectDestinationTrait::setRedirectDestination public function Sets the redirect destination service.
StringTranslationTrait::$stringTranslation protected property The string translation service.
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::formatPluralTranslated protected function Formats a translated string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use.
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.
UrlGeneratorTrait::$urlGenerator protected property The url generator.
UrlGeneratorTrait::getUrlGenerator protected function Returns the URL generator service.
UrlGeneratorTrait::redirect protected function Returns a redirect response object for the specified route.
UrlGeneratorTrait::setUrlGenerator public function Sets the URL generator service.
UrlGeneratorTrait::url protected function Generates a URL or path for a specific route based on the given parameters.