Swing/RadioButtonsLabelAlignment のバックアップ(No.3)

JPanel p = new JPanel(new GridBagLayout());
p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
p.setFocusTraversalPolicy(new ContainerOrderFocusTraversalPolicy());
p.setFocusTraversalPolicyProvider(true);
p.setFocusable(false);
// p.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
boolean leftToRightParent = p.getComponentOrientation().isLeftToRight();
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 1;
gbc.insets.top = 5;
ButtonGroup group = new ButtonGroup();
List<JComponent> list = Arrays.asList(
    new JRadioButton("JRadioButton1"),
    new JRadioButton("JRadioButton2"),
    new JRadioButton("JRadioButton3"),
    new JLabel("JLabel1"),
    new JLabel("JLabel2"),
    new JCheckBox("JCheckBox1"),
    new JCheckBox("JCheckBox2"));
int gap = 0;
for (JComponent c : list) {
  // c.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
  gbc.insets.left = 0;
  gbc.insets.right = 0;
  if (c instanceof JRadioButton) {
    JRadioButton button = (JRadioButton) c;
    if (gap == 0) {
      gap = getIconSpace(button);
      button.setSelected(true);
    }
    group.add(button);
  } else if (c instanceof JLabel) {
    boolean leftToRight = c.getComponentOrientation().isLeftToRight();
    if (leftToRight && leftToRightParent) {
      gbc.insets.left = gap;
    } else if (leftToRight) {
      gbc.insets.right = gap;
    } else if (leftToRightParent) {
      gbc.insets.right = gap;
    } else {
      gbc.insets.left = gap;
    }
  }
  p.add(c, gbc);
}
gbc.gridx = 2;
gbc.weightx = 1.0;
gbc.insets.left = 5;
gbc.insets.right = 5;
list.forEach(c -> p.add(new JTextField(), gbc));