substitution.setState(substitution.getOldState());
substitution.revert();
            private void revertStateOfSelection() {                      Set selection = getSelectedTableEntries();                for (Iterator iter = selection.iterator(); iter.hasNext();) {                    NLSSubstitution substitution = (NLSSubstitution) iter.next();                    substitution.setState(substitution.getOldState());                                                        }                fTableViewer.refresh();                updateButtonStates((IStructuredSelection) fTableViewer.getSelection());            }