<?php

/**
 * @file
 * Contains \Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationSelected.
 */

namespace Drupal\language\Plugin\LanguageNegotiation;

use Drupal\language\LanguageNegotiationMethodBase;
use Symfony\Component\HttpFoundation\Request;

/**
 * Class for identifying language from a selected language.
 *
 * @Plugin(
 *   id = Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationSelected::METHOD_ID,
 *   weight = 12,
 *   name = @Translation("Selected language"),
 *   description = @Translation("Language based on a selected language."),
 *   config_path = "admin/config/regional/language/detection/selected"
 * )
 */
class LanguageNegotiationSelected extends LanguageNegotiationMethodBase {

  /**
   * The language negotiation method id.
   */
  const METHOD_ID = 'language-selected';

  /**
   * {@inheritdoc}
   */
  public function getLangcode(Request $request = NULL) {
    $langcode = NULL;

    if ($this->languageManager) {
      $langcode = $this->config->get('language.negotiation')->get('selected_langcode');
    }

    return $langcode;
  }

}