protected function makeQualifiedHandlerClassName($handler_type_key, $handler_type_info) {
    $relative_name_pieces = $this->getRelativeHandlerClassNamePieces($handler_type_key, $handler_type_info);
    $name_pieces = array_merge([
      'Drupal',
      '%module',
    ], $relative_name_pieces);


    $handler_class_name = static::makeQualifiedClassName($name_pieces);

    return $handler_class_name;
  }