List<FeedEntryTag> addList = Lists.newArrayList();
List<FeedEntryTag> removeList = Lists.newArrayList();
for (String tagName : tagNames) {
FeedEntryTag tag = tagMap.get(tagName);
if (tag == null) {
addList.add(new FeedEntryTag(user, entry, tagName));
}
}
for (FeedEntryTag tag : tags) {
if (!tagNames.contains(tag.getName())) {
removeList.add(tag);
}
}
feedEntryTagDAO.saveOrUpdate(addList);