001/* 002 * Copyright 2002-2014 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.servlet.mvc.method.annotation; 018 019import java.util.Map; 020 021import org.springframework.core.MethodParameter; 022import org.springframework.ui.Model; 023import org.springframework.ui.ModelMap; 024import org.springframework.validation.DataBinder; 025import org.springframework.web.bind.support.WebDataBinderFactory; 026import org.springframework.web.context.request.NativeWebRequest; 027import org.springframework.web.method.support.HandlerMethodArgumentResolver; 028import org.springframework.web.method.support.ModelAndViewContainer; 029import org.springframework.web.servlet.mvc.support.RedirectAttributes; 030import org.springframework.web.servlet.mvc.support.RedirectAttributesModelMap; 031 032/** 033 * Resolves method arguments of type {@link RedirectAttributes}. 034 * 035 * <p>This resolver must be listed ahead of 036 * {@link org.springframework.web.method.annotation.ModelMethodProcessor} and 037 * {@link org.springframework.web.method.annotation.MapMethodProcessor}, 038 * which support {@link Map} and {@link Model} arguments both of which are 039 * "super" types of {@code RedirectAttributes} and would also attempt to 040 * resolve a {@code RedirectAttributes} argument. 041 * 042 * @author Rossen Stoyanchev 043 * @since 3.1 044 */ 045public class RedirectAttributesMethodArgumentResolver implements HandlerMethodArgumentResolver { 046 047 @Override 048 public boolean supportsParameter(MethodParameter parameter) { 049 return RedirectAttributes.class.isAssignableFrom(parameter.getParameterType()); 050 } 051 052 @Override 053 public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, 054 NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception { 055 056 ModelMap redirectAttributes; 057 if(binderFactory != null) { 058 DataBinder dataBinder = binderFactory.createBinder(webRequest, null, null); 059 redirectAttributes = new RedirectAttributesModelMap(dataBinder); 060 } 061 else { 062 redirectAttributes = new RedirectAttributesModelMap(); 063 } 064 mavContainer.setRedirectModel(redirectAttributes); 065 return redirectAttributes; 066 } 067 068}