public static bool isEmptyOrNull(XYPlot plot)
 {
   if (plot != null)
   {
     int index = 0;
     for (int datasetCount = plot.getDatasetCount(); index < datasetCount; ++index)
     {
       if (!DatasetUtilities.isEmptyOrNull(plot.getDataset(index)))
         return false;
     }
   }
   return true;
 }