code: private void addAllNamesIntoTrie() {
          for (Map.Entry<String, ZNames> entry : _tzNamesMap.entrySet()) {
              entry.getValue().addAsTimeZoneIntoTrie(entry.getKey(), _namesTrie);
          }
          for (Map.Entry<String, ZNames> entry : _mzNamesMap.entrySet()) {
              entry.getValue().addAsMetaZoneIntoTrie(entry.getKey(), _namesTrie);
          }
      }
docs: Caller must synchronize.