/**
* Calculates modification date of topic taking it as last post in topic creation date. Used after
* deletion of the post. It is necessary to save the sort order of topics in the future.
*/
public void recalculateModificationDate() {
DateTime newTopicModificationDate = getFirstPost().getCreationDate();
for (Post post : posts) {
if (post.getCreationDate().isAfter(newTopicModificationDate.toInstant())) {
newTopicModificationDate = post.getCreationDate();
}
}
modificationDate = newTopicModificationDate;
}
/**
* Returns first post that is newer then give time
*
* @param time time to looking for newer post
* @return first post that is newer then give time or first post if there is no post that is newer
*/
private Post getFirstNewerPost(DateTime time) {
for (Post post : getPosts()) {
if (post.getCreationDate().isAfter(time)) {
return post;
}
}
return getFirstPost();
}