return null;
        }

        @Override
        public String changeSessionId() {
            return null;
        }

        @Override
        public boolean isRequestedSessionIdValid() {
            return false;
        }

        @Override
        public boolean isRequestedSessionIdFromCookie() {
            return false;
        }

        @Override

            return null;
        }

        @Override
        public String changeSessionId() {
            return null;
        }

        @Override
        public boolean isRequestedSessionIdValid() {
            return false;
        }

        @Override
        public boolean isRequestedSessionIdFromCookie() {
            return false;
        }

        @Override

            }

            userCode = getUserCodeFromRequest(request);
            if (StringUtil.isNotBlank(userCode)) {
                return userCode;
            }

            if (!request.isRequestedSessionIdValid()) {
                return null;
            }

            userCode = getUserCodeFromCookie(request);
            if (StringUtil.isBlank(userCode)) {

            }

            @Override
            public String changeSessionId() {
                return null;
            }

            @Override
            public boolean isRequestedSessionIdValid() {
                return false;
            }

            @Override
            public boolean isRequestedSessionIdFromCookie() {
                return false;
            }

            }

            @Override
            public String changeSessionId() {
                return null;
            }

            @Override
            public boolean isRequestedSessionIdValid() {
                return false;
            }

            @Override
            public boolean isRequestedSessionIdFromCookie() {
                return false;
            }

        }

        @Override
        public String changeSessionId() {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isRequestedSessionIdValid() {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isRequestedSessionIdFromCookie() {
            throw new UnsupportedOperationException();

            return null;
        }

        @Override
        public String changeSessionId() {
            return null;
        }

        @Override
        public boolean isRequestedSessionIdValid() {
            return false;
        }

        @Override
        public boolean isRequestedSessionIdFromCookie() {
            return false;
        }

        @Override