/**
  * Insert the given stream at the beginning of the existing stream array.
  *
  * @param streamToBeInserted
  */
 public void insertCOSStream(PDStream streamToBeInserted) {
   COSArray tmp = new COSArray();
   tmp.add(streamToBeInserted);
   tmp.addAll(streams);
   streams.clear();
   streams = tmp;
 }