class OmKeyLocationInfoGroup {

  public List<OmKeyLocationInfo> getLocationList() {
    return locationVersionMap.values().stream().flatMap(List::stream)
        .collect(Collectors.toList());
  }

  public  OmKeyLocationInfoGroup(long version,
                                List<OmKeyLocationInfo> locations);
  public  OmKeyLocationInfoGroup(long version,
                                Map<Long, List<OmKeyLocationInfo>> locations);

}