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<?php
/**
 * @file
 * Contains \Drupal\user\Plugin\LanguageNegotiation\LanguageNegotiationUser.
 */
namespace Drupal\user\Plugin\LanguageNegotiation;
use Drupal\language\LanguageNegotiationMethodBase;
use Symfony\Component\HttpFoundation\Request;
/**
 * Class for identifying language from the user preferences.
 *
 * @LanguageNegotiation(
 *   id = \Drupal\user\Plugin\LanguageNegotiation\LanguageNegotiationUser::METHOD_ID,
 *   weight = -4,
 *   name = @Translation("User"),
 *   description = @Translation("Follow the user's language preference.")
 * )
 */
class LanguageNegotiationUser extends LanguageNegotiationMethodBase {
  /**
   * The language negotiation method id.
   */
  const METHOD_ID = 'language-user';
  /**
   * {@inheritdoc}
   */
  public function getLangcode(Request $request = NULL) {
    $langcode = NULL;
    // User preference (only for authenticated users).
    if ($this->languageManager && $this->currentUser->isAuthenticated()) {
      $preferred_langcode = $this->currentUser->getPreferredLangcode();
      $default_langcode = $this->languageManager->getDefaultLanguage()->getId();
      $languages = $this->languageManager->getLanguages();
      if (!empty($preferred_langcode) && $preferred_langcode != $default_langcode && isset($languages[$preferred_langcode])) {
        $langcode = $preferred_langcode;
      }
    }
    // No language preference from the user.
    return $langcode;
  }
}