spring RedirectAttributesMethodArgumentResolver 源码
spring RedirectAttributesMethodArgumentResolver 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RedirectAttributesMethodArgumentResolver.java
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.servlet.mvc.method.annotation;
import java.util.Map;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.util.Assert;
import org.springframework.validation.DataBinder;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import org.springframework.web.servlet.mvc.support.RedirectAttributesModelMap;
/**
* Resolves method arguments of type {@link RedirectAttributes}.
*
* <p>This resolver must be listed ahead of
* {@link org.springframework.web.method.annotation.ModelMethodProcessor} and
* {@link org.springframework.web.method.annotation.MapMethodProcessor},
* which support {@link Map} and {@link Model} arguments both of which are
* "super" types of {@code RedirectAttributes} and would also attempt to
* resolve a {@code RedirectAttributes} argument.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class RedirectAttributesMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
return RedirectAttributes.class.isAssignableFrom(parameter.getParameterType());
}
@Override
public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {
Assert.state(mavContainer != null, "RedirectAttributes argument only supported on regular handler methods");
ModelMap redirectAttributes;
if (binderFactory != null) {
DataBinder dataBinder = binderFactory.createBinder(webRequest, null, DataBinder.DEFAULT_OBJECT_NAME);
redirectAttributes = new RedirectAttributesModelMap(dataBinder);
}
else {
redirectAttributes = new RedirectAttributesModelMap();
}
mavContainer.setRedirectModel(redirectAttributes);
return redirectAttributes;
}
}
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