$type can be NULL, or one of the language types supported by the language manager, typically:

• LanguageInterface::TYPE_INTERFACE
• LanguageInterface::TYPE_CONTENT
• LanguageInterface::TYPE_URL

Parameters

string|null $parameter: The parameter, or NULL to indicate all possible parameter values.

Return value

string The string representation of the cache context. When $parameter is NULL, a value representing all possible parameters must be generated.

Throws

\RuntimeException In case an invalid language type is specified.

Overrides CalculatedCacheContextInterface::getContext

See also

\Drupal\Core\Language\LanguageManagerInterface::getLanguageTypes()

File

core/lib/Drupal/Core/Cache/Context/LanguagesCacheContext.php, line 51

Class

LanguagesCacheContext

Defines the LanguagesCacheContext service, for "per language" caching.

Namespace

Drupal\Core\Cache\Context

Code

public function getContext($type = NULL) {
  if ($type === NULL) {
    $context_parts = [];
    if ($this->languageManager
      ->isMultilingual()) {
      foreach ($this->languageManager
        ->getLanguageTypes() as $type) {
        $context_parts[] = $this->languageManager
          ->getCurrentLanguage($type)
          ->getId();
      }
    }
    else {
      $context_parts[] = $this->languageManager
        ->getCurrentLanguage()
        ->getId();
    }
    return implode(',', $context_parts);
  }
  else {
    $language_types = $this->languageManager
      ->getDefinedLanguageTypesInfo();
    if (!isset($language_types[$type])) {
      throw new \RuntimeException(sprintf('The language type "%s" is invalid.', $type));
    }
    return $this->languageManager
      ->getCurrentLanguage($type)
      ->getId();
  }
}

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