public static List <Links> getLinksFromDB()
        {
            String username = Security.getUsername();

            LinksDao dataLayer = new LinksDao();

            List <Links> userLinks = dataLayer.getUserLinks(username);

            SessionVariableManager.setLinks(userLinks);
            return(userLinks);
        }
        public static List <Links> getAllowedLinks()
        {
            List <Links> allowedLinks = SessionVariableManager.getLinks();

            if (allowedLinks != null)
            {
                return(allowedLinks);
            }
            else
            {
                allowedLinks = getLinksFromDB();
            }

            return(allowedLinks);
        }