private void changeOperationForSelection() {
    for (int row : myTable.getSelectedRows()) {
      if (row != -1) {
        final DirDiffElementImpl element = myModel.getElementAt(row);
        if (element != null) {
          element.setNextOperation();
          myModel.fireTableRowsUpdated(row, row);
        }
      }
    }
  }
private void changeOperationForSelection()