public static function factory(Storage $storage, $row)
 {
     $permission = new RolePermission($storage);
     $permission->setRoleID($row["roleid"]);
     $permission->setPermissionID($row["permissionid"]);
     $permission->setGliederungID($row["gliederungid"]);
     $permission->isTransitive($row["transitive"]);
     return $permission;
 }