@Override
 public ITmfContext armRequest(ITmfDataRequest<TmfData> request) {
   if (request instanceof ITmfEventRequest<?>) {
     ITmfContext context =
         fTrace.seekEvent(((ITmfEventRequest<?>) request).getRange().getStartTime());
     return context;
   }
   return null;
 }
 @Override
 public TmfData getNext(ITmfContext context) {
   return fTrace.getNext(context);
 }