@Override
  public Map<String, Integer> getCounts() {
    return new ImmutableMap.Builder<String, Integer>()
            .put(CALENDARS_COUNT_DATA_NAME, calendars.size())
            .put(EVENTS_COUNT_DATA_NAME, events.size())
            .build();
  }
A Wrapper for all the possible objects that can be returned by a calendar exporter.
portability-types-common/src/main/java/org/datatransferproject/types/common/models/calendar/CalendarContainerResource.java