docs: private StreamSet getStreamSet(SIBUuid12 streamID, boolean create)
     {
       if (tc.isEntryEnabled())
         SibTr.entry(tc, "getStreamSet", new Object[]{streamID, new Boolean(create)});
  
       StreamSet streamSet = null;
       synchronized (streamSets)
       {
         streamSet = (StreamSet) streamSets.get(streamID);
         if ((streamSet == null) && create)
         {
           streamSet = new StreamSet(streamID, null, 0, StreamSet.Type.INTERNAL_INPUT);
           streamSets.put(streamID, streamSet);
         }
       }
  
       if (tc.isEntryEnabled())
         SibTr.exit(tc, "getStreamSet", streamSet);
       return streamSet;
     }