001/* 002 * Copyright 2002-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.method.annotation; 018 019import org.springframework.core.MethodParameter; 020import org.springframework.lang.Nullable; 021import org.springframework.util.Assert; 022import org.springframework.web.bind.support.SessionStatus; 023import org.springframework.web.bind.support.WebDataBinderFactory; 024import org.springframework.web.context.request.NativeWebRequest; 025import org.springframework.web.method.support.HandlerMethodArgumentResolver; 026import org.springframework.web.method.support.ModelAndViewContainer; 027 028/** 029 * Resolves a {@link SessionStatus} argument by obtaining it from 030 * the {@link ModelAndViewContainer}. 031 * 032 * @author Rossen Stoyanchev 033 * @since 3.1 034 */ 035public class SessionStatusMethodArgumentResolver implements HandlerMethodArgumentResolver { 036 037 @Override 038 public boolean supportsParameter(MethodParameter parameter) { 039 return SessionStatus.class == parameter.getParameterType(); 040 } 041 042 @Override 043 public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer, 044 NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception { 045 046 Assert.state(mavContainer != null, "ModelAndViewContainer is required for session status exposure"); 047 return mavContainer.getSessionStatus(); 048 } 049 050}