trait LanguageConfigCollectionNameTrait in Drupal 9

trait LanguageConfigCollectionNameTrait {

  /**
   * Creates a configuration collection name based on a language code.
   *
   * @param string $langcode
   *   The language code.
   *
   * @return string
   *   The configuration collection name for a language code.
   */
  protected function createConfigCollectionName($langcode) {
    return 'language.' . $langcode;
  }

  /**
   * Converts a configuration collection name to a language code.
   *
   * @param string $collection
   *   The configuration collection name.
   *
   * @return string
   *   The language code of the collection.
   *
   * @throws \InvalidArgumentException
   *   Exception thrown if the provided collection name is not in the format
   *   "language.LANGCODE".
   *
   * @see self::createConfigCollectionName()
   */
  protected function getLangcodeFromCollectionName($collection) {
    preg_match('/^language\\.(.*)$/', $collection, $matches);
    if (!isset($matches[1])) {
      throw new \InvalidArgumentException("'{$collection}' is not a valid language override collection");
    }
    return $matches[1];
  }

}