emptyFeed.setProperty(entry.getKey(), entry.getValue());
}
/* Merge with existing (remember number of added new news) */
List<INews> newNewsBeforeMerge = feed.getNewsByStates(EnumSet.of(INews.State.NEW));
MergeResult mergeResult = feed.mergeAndCleanUp(emptyFeed);
List<INews> newNewsAdded = getNewNewsAdded(feed, newNewsBeforeMerge);
updateStateOfUnsavedNewNews(newNewsAdded);
/* Retention Policy */
List<INews> deletedNews = RetentionStrategy.process(bookMark, feed, newNewsAdded.size());