@SuppressWarnings("restriction")
    JavaEditor currentJavaEditor;
    @Override
    public void setActiveEditor(IAction arg0, IEditorPart currentEditor) {
        currentJavaEditor = (JavaEditor) currentEditor;
    }

    @SuppressWarnings("restriction")
    @Override
    public void selectionChanged(IAction arg0, ISelection selection) {
        try {
            IJavaElement javaElement =
                SelectionConverter.resolveEnclosingElement
                        (currentJavaEditor, (ITextSelection) selection);
            //getElementAtOffset((JavaEditor)currentJavaEditor);
            System.out.println("java element : " + javaElement.getElementName());
        } catch (JavaModelException e) {
            e.printStackTrace();
        }
    }