private CollectionGroup getCollectionGroup(String routeNumber, String sessionCode, Date date) {
if (date == null) {
throw new IllegalArgumentException("date cannot be null");
}
final String key = String.format("%5s-%2s-%tF", routeNumber, sessionCode, date);
CollectionGroup group = groups.get(key);
if (group == null) {
group = DairyFactory.eINSTANCE.createCollectionGroup();
group.setReferenceNumber(key);
group.setCollectionDate(date);
group.setStatus(JournalStatus.COMPLETE);
group.setDriver(DEFAULT_DRIVER);
group.setType(CollectionGroupType.JOURNAL_GROUP);
group.setCollectionCenter(getCenter(routeNumber));
groups.put(key, group);
}
return group;
}
