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<?php
namespace Drupal\language\EventSubscriber;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Language\Language;
use Drupal\Core\Language\LanguageDefault;
use Drupal\Core\Language\LanguageManagerInterface;
use Drupal\Core\Config\ConfigCrudEvent;
use Drupal\Core\Config\ConfigEvents;
use Drupal\language\ConfigurableLanguageManager;
use Drupal\language\HttpKernel\PathProcessorLanguage;
use Drupal\language\LanguageNegotiatorInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
* Deletes the container if default language has changed.
*/
class ConfigSubscriber implements EventSubscriberInterface {
/**
* The language manager.
*
* @var \Drupal\Core\Language\LanguageManagerInterface
*/
protected $languageManager;
/**
* The default language.
*
* @var \Drupal\Core\Language\LanguageDefault
*/
protected $languageDefault;
/**
* The configuration factory.
*
* @var \Drupal\Core\Config\ConfigFactoryInterface
*/
protected $configFactory;
/**
* The language negotiator.
*
* @var \Drupal\language\LanguageNegotiatorInterface
*/
protected $languageNegotiator;
/**
* The language path processor.
*
* @var \Drupal\language\HttpKernel\PathProcessorLanguage
*/
protected $pathProcessorLanguage;
/**
* Constructs a new class object.
*
* @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
* The language manager.
* @param \Drupal\Core\Language\LanguageDefault $language_default
* The default language.
* @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
* The configuration factory.
* @param \Drupal\language\LanguageNegotiatorInterface $language_negotiator
* The language negotiator.
*/
public function __construct(LanguageManagerInterface $language_manager, LanguageDefault $language_default, ConfigFactoryInterface $config_factory, LanguageNegotiatorInterface $language_negotiator) {
$this->languageManager = $language_manager;
$this->languageDefault = $language_default;
$this->configFactory = $config_factory;
$this->languageNegotiator = $language_negotiator;
}
/**
* Causes the container to be rebuilt on the next request.
*
* This event subscriber assumes that the new default langcode and old default
* langcode are valid langcodes. If the schema definition of either
* system.site:default_langcode or language.negotiation::url.prefixes changes
* then this event must be changed to work with both the old and new schema
* definition so this event is update safe.
*
* @param \Drupal\Core\Config\ConfigCrudEvent $event
* The configuration event.
*/
public function onConfigSave(ConfigCrudEvent $event) {
$saved_config = $event->getConfig();
if ($saved_config->getName() == 'system.site' && $event->isChanged('default_langcode')) {
$new_default_langcode = $saved_config->get('default_langcode');
$default_language = $this->configFactory->get('language.entity.' . $new_default_langcode);
// During an import the language might not exist yet.
if (!$default_language->isNew()) {
$this->languageDefault->set(new Language($default_language->get()));
$this->languageManager->reset();
// Directly update language negotiation settings instead of calling
// language_negotiation_url_prefixes_update() to ensure that the code
// obeys the hook_update_N() restrictions.
$negotiation_config = $this->configFactory->getEditable('language.negotiation');
$negotiation_changed = FALSE;
$url_prefixes = $negotiation_config->get('url.prefixes');
$old_default_langcode = $saved_config->getOriginal('default_langcode');
if (empty($url_prefixes[$old_default_langcode])) {
$negotiation_config->set('url.prefixes.' . $old_default_langcode, $old_default_langcode);
$negotiation_changed = TRUE;
}
if (empty($url_prefixes[$new_default_langcode])) {
$negotiation_config->set('url.prefixes.' . $new_default_langcode, '');
$negotiation_changed = TRUE;
}
if ($negotiation_changed) {
$negotiation_config->save(TRUE);
}
}
// Trigger a container rebuild on the next request by invalidating it.
ConfigurableLanguageManager::rebuildServices();
}
elseif ($saved_config->getName() == 'language.types' && $event->isChanged('negotiation')) {
// If the negotiation configuration changed the language negotiator and
// the language path processor have to be reset so that they regenerate
// the method instances and also sort them accordingly to the new config.
$this->languageNegotiator->reset();
if (isset($this->pathProcessorLanguage)) {
$this->pathProcessorLanguage->reset();
}
}
}
/**
* Injects the language path processors on multilingual site configuration.
*
* @param \Drupal\language\HttpKernel\PathProcessorLanguage $path_processor_language
* The language path processor.
*/
public function setPathProcessorLanguage(PathProcessorLanguage $path_processor_language) {
$this->pathProcessorLanguage = $path_processor_language;
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
$events[ConfigEvents::SAVE][] = ['onConfigSave', 0];
return $events;
}
}
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