Iterator joiners = Layout.joiners.iterator();
Iterator joiners = Layout.getJoiners().iterator();
    public static void createJoinerSchedules(FlatNode top)     {	schedules = new HashMap();	buffers = new HashMap();			Iterator joiners = Layout.joiners.iterator();	while (joiners.hasNext()) {	    FlatNode node = (FlatNode)joiners.next();	    current = node;	    buffers.put(current, new HashSet());	    buildJoinerSchedule(node);	}    }