}

  private static class UnmovableFile extends File {

    private final boolean canRename;
    private final boolean canDelete;

    UnmovableFile(File file, boolean canRename, boolean canDelete) {
      super(file.getPath());
      this.canRename = canRename;
      this.canDelete = canDelete;
    }

    @Override
    public boolean renameTo(File to) {
      return canRename && super.renameTo(to);
    }