code: private synchronized void initPartyMap() {
  		if (partyMap == null) {
  			final DataContainer<ViewRiksdagenVoteDataBallotPartySummaryDaily, RiksdagenVoteDataBallotPartyPeriodSummaryEmbeddedId> partyBallotSummaryDailyDataContainer = getApplicationManager()
  					.getDataContainer(ViewRiksdagenVoteDataBallotPartySummaryDaily.class);
  
  			partyMap = partyBallotSummaryDailyDataContainer.getAll().parallelStream().filter(Objects::nonNull)
  					.collect(Collectors.groupingBy(t -> t.getEmbeddedId().getParty()));
  		}
  	}
docs: Inits the party map.