public WorksheetEntry addWorksheet(WorksheetEntry worksheetEntry, SpreadsheetUrl worksheetfeedUrl)
     throws IOException {
   AtomContent content = AtomContent.forEntry(DICTIONARY, worksheetEntry);
   HttpRequest request = requestFactory.buildPostRequest(worksheetfeedUrl, content);
   // request.getHeaders().setIfNoneMatch(worksheetEntry.etag);
   return request.execute().parseAs(worksheetEntry.getClass());
 }
 public CellEntry addCell(WorksheetEntry we, String value, int row, int col) throws IOException {
   CellEntry ce = CellEntry.makeInstance(value, row, col);
   new CellEntry();
   String link = we.getCellFeedLink();
   return addCellEntry(ce, new SpreadsheetUrl(link));
 }