FileUrlParts.folderId.get(folder.getFileId()));
String payload = new FileSerializer(folder).generateFileUpdatePayload();
Map<String, String> headers = new HashMap<String, String>();
headers.put(Headers.ContentType, Headers.ATOM);
Response response = updateData(requestUri, null, headers, payload, null);
checkResponseCode(response, HTTPCode.OK);
File r = getFileFeedHandler().createEntity(response);
folder.clearFieldsMap();
folder.setDataHandler(r.getDataHandler());
return folder;