private void sortInPlace(final int[] indexes) {
    // the indexes are a discrete set of values that have no duplicates,
    // and describe the relative order of each of them.
    // as a result, we can do some tricks....
    final int[] unsorted = indexes.clone();
    Arrays.sort(unsorted);
    final Content[] usc = new Content[unsorted.length];
    for (int i = 0; i < usc.length; i++) {
      usc[i] = elementData[indexes[i]];
    }
    // usc contains the content in their pre-sorted order....
    for (int i = 0; i < indexes.length; i++) {
      elementData[unsorted[i]] = usc[i];
    }
  }
private void sortInPlace(final int[] indexes)