class PagersCacheContext in Drupal 8

Defines a cache context for "per page in a pager" caching.

Cache context ID: 'url.query_args.pagers' (to vary by all pagers). Calculated cache context ID: 'url.query_args.pagers:%pager_id', e.g. 'url.query_args.pagers:1' (to vary by the pager with ID 1).

Hierarchy

• class \Drupal\Core\Cache\Context\PagersCacheContext implements CalculatedCacheContextInterface uses DeprecatedServicePropertyTrait

1 string reference to 'PagersCacheContext'

core.services.yml in core/core.services.yml

core/core.services.yml

1 service uses PagersCacheContext

cache_context.url.query_args.pagers in core/core.services.yml

Drupal\Core\Cache\Context\PagersCacheContext

File

core/lib/Drupal/Core/Cache/Context/PagersCacheContext.php, line 16

Namespace

Drupal\Core\Cache\Context

class PagersCacheContext implements CalculatedCacheContextInterface {
  use DeprecatedServicePropertyTrait;

  /**
   * {@inheritdoc}
   */
  protected $deprecatedProperties = [
    'requestStack' => 'request_stack',
  ];

  /**
   * The pager parameters.
   *
   * @var \Drupal\Core\Pager\PagerParametersInterface
   */
  protected $pagerParams;

  /**
   * Constructs a new PagersCacheContext object.
   *
   * @param \Drupal\Core\Pager\PagerParametersInterface $pager_params
   *   The pager parameters.
   */
  public function __construct($pager_params) {
    if (!$pager_params instanceof PagerParametersInterface) {
      @trigger_error('Calling ' . __METHOD__ . ' with a $pager_params argument that does not implement \\Drupal\\Core\\Pager\\PagerParametersInterface is deprecated in drupal:8.8.0 and is required in drupal:9.0.0. See https://www.drupal.org/node/2779457', E_USER_DEPRECATED);
      $pager_params = \Drupal::service('pager.parameters');
    }
    $this->pagerParams = $pager_params;
  }

  /**
   * {@inheritdoc}
   */
  public static function getLabel() {
    return t('Pager');
  }

  /**
   * {@inheritdoc}
   *
   * @see \Drupal\Core\Pager\PagerParametersInterface::findPage()
   */
  public function getContext($pager_id = NULL) {

    // The value of the 'page' query argument contains the information that
    // controls *all* pagers.
    if ($pager_id === NULL) {
      return $this->pagerParams
        ->getPagerParameter();
    }
    return $pager_id . '.' . $this->pagerParams
      ->findPage($pager_id);
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheableMetadata($pager_id = NULL) {
    return new CacheableMetadata();
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DeprecatedServicePropertyTrait::__get	public	function	Allows to access deprecated/removed properties.
PagersCacheContext::$deprecatedProperties	protected	property
PagersCacheContext::$pagerParams	protected	property	The pager parameters.
PagersCacheContext::getCacheableMetadata	public	function	Gets the cacheability metadata for the context based on the parameter value. Overrides CalculatedCacheContextInterface::getCacheableMetadata
PagersCacheContext::getContext	public	function	Overrides CalculatedCacheContextInterface::getContext
PagersCacheContext::getLabel	public static	function	Returns the label of the cache context. Overrides CalculatedCacheContextInterface::getLabel
PagersCacheContext::__construct	public	function	Constructs a new PagersCacheContext object.