public int addDataSegment(final String iSegmentName, final String iSegmentFileName) {
   checkOpeness();
   return underlying.addDataSegment(iSegmentName, iSegmentFileName);
 }
 public int addDataSegment(final String iSegmentName, final String iLocation) {
   checkOpeness();
   return underlying.addDataSegment(iSegmentName, iLocation);
 }