final Map<String, String> map = configuration.tryGetMapFromConfiguration();
final String idHandlerName = map.get(CONFIG_ID_HANDLER);
if (idHandlerName.equals("orientdb"))
return new OrientElementIdHandler();
else if (idHandlerName.equals("titan-berkeleyje"))
return new TitanBerkeleyJEElementIdHandler();
else
return DEFAULT_ID_HANDLER;
}