JFileChooserで読み取り専用ファイルのリネームを禁止

class MetalCanWriteFileChooserUI extends MetalFileChooserUI {
  private BasicDirectoryModel model2;
  protected MetalCanWriteFileChooserUI(JFileChooser chooser) {
    super(chooser);
  }

  public static ComponentUI createUI(JComponent c) {
    if (c instanceof JFileChooser) {
      return new MetalCanWriteFileChooserUI((JFileChooser) c);
    }
    throw new InternalError("Should never happen");
  }

  @Override public void createModel() {
    if (model2 != null) {
      model2.invalidateFileCache();
    }
    model2 = new BasicDirectoryModel(getFileChooser()) {
      @Override public boolean renameFile(File oldFile, File newFile) {
        return oldFile.canWrite() ? super.renameFile(oldFile, newFile) : false;
      }
    };
  }

  @Override public BasicDirectoryModel getModel() {
    return model2;
  }
}