code: public void setRowReader(String newReaderClassName)
      {
          try
          {
              m_rowReader =
                  (RowReader) ClassHelper.newInstance(
                      newReaderClassName,
                      ClassDescriptor.class,
                      this);
          }
          catch (Exception e)
          {
              throw new MetadataException("Instantiating of current set RowReader failed", e);
          }
      }
docs: sets the row reader class name for thie class descriptor