code: private void addBallotData(final DataValueCalculator dataValueCalculator, final DataSeries dataSeries,
  			final SimpleDateFormat simpleDateFormat, final Series series,
  			final Entry<String, List<ViewRiksdagenVoteDataBallotPartySummaryDaily>> entry) {
  		series.addSeries(new XYseries().setLabel(getPartyName(entry.getKey())));
  
  		dataSeries.newSeries();
  		final List<ViewRiksdagenVoteDataBallotPartySummaryDaily> list = entry.getValue();
  		for (final ViewRiksdagenVoteDataBallotPartySummaryDaily viewRiksdagenVoteDataBallotPartySummaryDaily : list) {
  			if (viewRiksdagenVoteDataBallotPartySummaryDaily != null) {
  				dataSeries.add(
  						simpleDateFormat
  								.format(viewRiksdagenVoteDataBallotPartySummaryDaily.getEmbeddedId().getVoteDate()),
  								dataValueCalculator.getDataValue(viewRiksdagenVoteDataBallotPartySummaryDaily));
  			}
  		}
  	}
docs: Adds the ballot data.
  
  @param dataValueCalculator the data value calculator
  @param dataSeries          the data series
  @param simpleDateFormat    the simple date format
  @param series              the series
  @param entry               the entry