/**
* Retrieves the SemanticGraph of the query result the user is interested in, and returns a
* feedback text with all information about that object
*
* @param user user ID
* @param idx Index
* @return AnchorInfo[], serialisable version of feedback text, empty if the user's session is
* expired, null if an error occurred
*/
public AnchorInfo[] getBrowsingDescription(String user, int idx) {
if (!userMap.containsKey(user)) return new AnchorInfo[0];
LiberSession session = userMap.get(user);
synchronized (session) {
session.setLastUpdated();
return session.getBrowsingDescription(idx);
}
}
