public final Set<ilarkesto.base.time.Date> getReleaseDates() {
if (releaseDatesCache == null) {
releaseDatesCache = new HashSet<ilarkesto.base.time.Date>();
for (Release e : getEntities()) {
if (e.isReleaseDateSet()) releaseDatesCache.add(e.getReleaseDate());
}
}
return releaseDatesCache;
}
