public Object execute(ExecutionEvent event) throws ExecutionException {
      IStructuredSelection selection = (IStructuredSelection) HandlerUtil
      .getActiveMenuSelection(event);
      if (selection != null) {
         IStructuredSelection strucSelection = (IStructuredSelection) selection;
         for (Iterator<Object> iterator = strucSelection.iterator(); iterator
               .hasNext();) {
            Object element = iterator.next();
           // if (element instanceof IResource) {
               IResource resource = (IResource)element;
               try {
                  Map props = resource.getPersistentProperties();

//...