+ /**
+ * Returns the post with the given ID. If no post exists yet with the given
+ * ID, a new post is returned.
+ *
+ * @param postId
+ * The ID of the post
+ * @return The post
+ */
+ public Post getPost(String postId) {
+ if (!postCache.containsKey(postId)) {
+ postCache.put(postId, new Post(postId));
+ }
+ return postCache.get(postId);
+ }
+
+ /**
+ * Returns the reply with the given ID. If no reply exists yet with the
+ * given ID, a new reply is returned.
+ *
+ * @param replyId
+ * The ID of the reply
+ * @return The reply
+ */
+ public Reply getReply(String replyId) {
+ if (!replyCache.containsKey(replyId)) {
+ replyCache.put(replyId, new Reply(replyId));
+ }
+ return replyCache.get(replyId);
+ }
+
+ /**
+ * Gets all replies to the given post, sorted by date, oldest first.
+ *
+ * @param post
+ * The post the replies refer to
+ * @return The sorted list of replies for the post
+ */
+ public List<Reply> getReplies(Post post) {
+ List<Reply> replies = new ArrayList<Reply>();
+ for (Reply reply : replyCache.values()) {
+ if (reply.getPost().equals(post)) {
+ replies.add(reply);
+ }
+ }
+ Collections.sort(replies, new Comparator<Reply>() {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public int compare(Reply leftReply, Reply rightReply) {
+ return (int) Math.max(Integer.MIN_VALUE, Math.min(Integer.MAX_VALUE, leftReply.getTime() - rightReply.getTime()));
+ }
+ });
+ return replies;
+ }
+