docs: public boolean hasStream(SIBUuid12 streamID, int priority, Reliability reliability ) throws SIResourceException 
    {
      if (tc.isEntryEnabled()) 
        SibTr.entry(tc, "hasStream", 
          new Object[]{streamID, new Integer(priority), reliability});
          
      StreamSet streamSet = (StreamSet) streamSets.get(streamID);
      if(streamSet != null) 
      {
        if ( streamSet.getStream(priority, reliability) != null )        
        { 
          if (tc.isEntryEnabled()) SibTr.exit(tc, "hasStream", Boolean.TRUE);
          return true;
        }  
      }
      if (tc.isEntryEnabled()) SibTr.exit(tc, "hasStream", Boolean.FALSE);
      return false;  
    }