spring ModelMethodProcessor 源码
spring ModelMethodProcessor 代码
文件路径：/spring-web/src/main/java/org/springframework/web/method/annotation/ModelMethodProcessor.java
/*
* Copyright 2002-2020 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.method.annotation;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.ui.Model;
import org.springframework.util.Assert;
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.HandlerMethodReturnValueHandler;
import org.springframework.web.method.support.ModelAndViewContainer;
/**
* Resolves {@link Model} arguments and handles {@link Model} return values.
*
* <p>A {@link Model} return type has a set purpose. Therefore this handler
* should be configured ahead of handlers that support any return value type
* annotated with {@code @ModelAttribute} or {@code @ResponseBody} to ensure
* they don't take over.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class ModelMethodProcessor implements HandlerMethodArgumentResolver, HandlerMethodReturnValueHandler {
@Override
public boolean supportsParameter(MethodParameter parameter) {
return Model.class.isAssignableFrom(parameter.getParameterType());
}
@Override
@Nullable
public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {
Assert.state(mavContainer != null, "ModelAndViewContainer is required for model exposure");
return mavContainer.getModel();
}
@Override
public boolean supportsReturnType(MethodParameter returnType) {
return Model.class.isAssignableFrom(returnType.getParameterType());
}
@Override
public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType,
ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {
if (returnValue == null) {
return;
}
else if (returnValue instanceof Model) {
mavContainer.addAllAttributes(((Model) returnValue).asMap());
}
else {
// should not happen
throw new UnsupportedOperationException("Unexpected return type [" +
returnType.getParameterType().getName() + "] in method: " + returnType.getMethod());
}
}
}
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