class QueryArgsCacheContext in Drupal 8

Defines the QueryArgsCacheContext service, for "per query args" caching.

Cache context ID: 'url.query_args' (to vary by all query arguments). Calculated cache context ID: 'url.query_args:%key', e.g.'url.query_args:foo' (to vary by the 'foo' query argument).

Hierarchy

• class \Drupal\Core\Cache\Context\RequestStackCacheContextBase
  • class \Drupal\Core\Cache\Context\QueryArgsCacheContext implements CalculatedCacheContextInterface

1 file declares its use of QueryArgsCacheContext

QueryArgsCacheContextTest.php in core/tests/Drupal/Tests/Core/Cache/Context/QueryArgsCacheContextTest.php

1 string reference to 'QueryArgsCacheContext'

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

core/core.services.yml

1 service uses QueryArgsCacheContext

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

Drupal\Core\Cache\Context\QueryArgsCacheContext

File

core/lib/Drupal/Core/Cache/Context/QueryArgsCacheContext.php, line 14

Namespace

Drupal\Core\Cache\Context

class QueryArgsCacheContext extends RequestStackCacheContextBase implements CalculatedCacheContextInterface {

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

  /**
   * {@inheritdoc}
   */
  public function getContext($query_arg = NULL) {
    if ($query_arg === NULL) {

      // All arguments requested. Use normalized query string to minimize
      // variations.
      $value = $this->requestStack
        ->getCurrentRequest()
        ->getQueryString();
      return $value !== NULL ? $value : '';
    }
    elseif ($this->requestStack
      ->getCurrentRequest()->query
      ->has($query_arg)) {
      $value = $this->requestStack
        ->getCurrentRequest()->query
        ->get($query_arg);
      if (is_array($value)) {
        return http_build_query($value);
      }
      elseif ($value !== '') {
        return $value;
      }
      return '?valueless?';
    }
    return '';
  }

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

}

Members

Name	Modifiers	Type	Description	Overrides
QueryArgsCacheContext::getCacheableMetadata	public	function	Gets the cacheability metadata for the context based on the parameter value. Overrides CalculatedCacheContextInterface::getCacheableMetadata
QueryArgsCacheContext::getContext	public	function	Returns the string representation of the cache context. Overrides CalculatedCacheContextInterface::getContext
QueryArgsCacheContext::getLabel	public static	function	Returns the label of the cache context. Overrides CalculatedCacheContextInterface::getLabel
RequestStackCacheContextBase::$requestStack	protected	property	The request stack.
RequestStackCacheContextBase::__construct	public	function	Constructs a new RequestStackCacheContextBase class.