Swing/WindowClosingAction のバックアップ(No.6)

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 {
      Component invoker = c.getParent();
      window = SwingUtilities.getWindowAncestor(invoker);
    }
    if (window != null) {
      //window.dispose();
      window.dispatchEvent(new WindowEvent(window, WindowEvent.WINDOW_CLOSING));
    }
  }
}