Swing/WindowClosingAction のバックアップ(No.1)

private static class ExitAction extends AbstractAction{
  public ExitAction() {
    super("Exit");
  }
  @Override public void actionPerformed(ActionEvent e) {
    JComponent c = (JComponent)e.getSource();
    Window window = null;
    Container parent = c.getParent();
    if(parent instanceof JPopupMenu) {
      JPopupMenu popup = (JPopupMenu)parent;
      JComponent invoker = (JComponent)popup.getInvoker();
      window = SwingUtilities.getWindowAncestor(invoker);
    }else if(parent instanceof JToolBar) {
      JToolBar toolbar = (JToolBar)parent;
      if(((BasicToolBarUI)toolbar.getUI()).isFloating()) {
        window = SwingUtilities.getWindowAncestor(toolbar).getOwner();
      }else{
        window = SwingUtilities.getWindowAncestor(toolbar);
      }
    }else{
      JComponent invoker = (JComponent)c.getParent();
      window = SwingUtilities.getWindowAncestor(invoker);
    }
    if(window!=null) {
      //window.dispose();
      window.dispatchEvent(new WindowEvent(window, WindowEvent.WINDOW_CLOSING));
    }
  }
}