JFileChooser をディレクトリに制限するにはどうすればよいですか? 質問する

将来誰かがこれを必要とする場合に備えて:

class DirectoryRestrictedFileSystemView extends FileSystemView
{
    private final File[] rootDirectories;

    DirectoryRestrictedFileSystemView(File rootDirectory)
    {
        this.rootDirectories = new File[] {rootDirectory};
    }

    DirectoryRestrictedFileSystemView(File[] rootDirectories)
    {
        this.rootDirectories = rootDirectories;
    }

    @Override
    public File createNewFolder(File containingDir) throws IOException
    {       
        throw new UnsupportedOperationException("Unable to create directory");
    }

    @Override
    public File[] getRoots()
    {
        return rootDirectories;
    }

    @Override
    public boolean isRoot(File file)
    {
        for (File root : rootDirectories) {
            if (root.equals(file)) {
                return true;
            }
        }
        return false;
    }
}

FileSystemView fsv = new DirectoryRestrictedFileSystemView(new File("X:\\"));
JFileChooser fileChooser = new JFileChooser(fsv);

FileSystemView fsv = new DirectoryRestrictedFileSystemView( new File[] {
    new File("X:\\"),
    new File("Y:\\")
});
JFileChooser fileChooser = new JFileChooser(fsv);