/** * Adds the information that was removed last back in the graph * * @param user User ID * @param type Session type (edit, query, browse) * @param key browsing session id (null if session type is EDIT) * @return AnchorInfo[] with serialisable version of feedback text, empty if the user's session is * expired or null if an error occurred */ public AnchorInfo[] redo(String user, int type, String key) { if (!userMap.containsKey(user)) return new AnchorInfo[0]; LiberSession session = userMap.get(user); synchronized (session) { session.setLastUpdated(); return session.redo(type, key); } }