private static PathFragment[] createFragments(String head, String special, String tail) {
    ArrayList<PathFragment> list = new ArrayList<>(3);
    if (head != null) {
      if (special != null || tail != null) list.add(new PathFragment(head + File.separatorChar, true));
      else return new PathFragment[]{new PathFragment(head, true)};
    }
    if (special != null) {
      if (tail != null) list.add(new PathFragment(special + File.separatorChar, false));
      else list.add(new PathFragment(special, false));
    }
    if (tail != null) list.add(new PathFragment(tail, true));
    return list.toArray(new PathFragment[0]);
  }
private static PathFragment[] createFragments(String head, String special, String tail)