/** Get the object associated with the ID in the session */
protected Object getSessionIdObject(String id) {
HttpSession session = getSession();
synchronized (session) {
BidiMap map = (BidiMap) session.getAttribute(SESSION_KEY_OBJ_MAP);
if (map == null) {
return null;
}
return map.getKey(id);
}
}
/** Get the ID with which the object is associated with the session, if any */
protected String getSessionObjectId(Object obj) {
HttpSession session = getSession();
BidiMap map;
synchronized (session) {
map = (BidiMap) session.getAttribute(SESSION_KEY_OBJ_MAP);
if (map == null) {
map = new DualHashBidiMap();
session.setAttribute(SESSION_KEY_OBJ_MAP, map);
}
}
synchronized (map) {
String id = (String) map.get(obj);
if (id == null) {
id = getNewSessionObjectId();
map.put(obj, id);
}
return id;
}
}