public void addChange(CommittedChangeList changeList, Change change) {
      ReceivedChangeList list = myMap.get(changeList);
      if (list == null) {
        list = new ReceivedChangeList(changeList);
        myMap.put(changeList, list);
      }
      list.addChange(change);
    }
public void addChange(CommittedChangeList changeList, Change change)