spring AbstractMappingJacksonResponseBodyAdvice 源码
spring AbstractMappingJacksonResponseBodyAdvice 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMappingJacksonResponseBodyAdvice.java
/*
* Copyright 2002-2014 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 org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter;
import org.springframework.http.converter.json.MappingJacksonValue;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.lang.Nullable;
/**
* A convenient base class for {@code ResponseBodyAdvice} implementations
* that customize the response before JSON serialization with
* {@link AbstractJackson2HttpMessageConverter}'s concrete subclasses.
*
* @author Rossen Stoyanchev
* @author Sebastien Deleuze
* @since 4.1
*/
public abstract class AbstractMappingJacksonResponseBodyAdvice implements ResponseBodyAdvice<Object> {
@Override
public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
return AbstractJackson2HttpMessageConverter.class.isAssignableFrom(converterType);
}
@Override
@Nullable
public final Object beforeBodyWrite(@Nullable Object body, MethodParameter returnType,
MediaType contentType, Class<? extends HttpMessageConverter<?>> converterType,
ServerHttpRequest request, ServerHttpResponse response) {
if (body == null) {
return null;
}
MappingJacksonValue container = getOrCreateContainer(body);
beforeBodyWriteInternal(container, contentType, returnType, request, response);
return container;
}
/**
* Wrap the body in a {@link MappingJacksonValue} value container (for providing
* additional serialization instructions) or simply cast it if already wrapped.
*/
protected MappingJacksonValue getOrCreateContainer(Object body) {
return (body instanceof MappingJacksonValue ? (MappingJacksonValue) body : new MappingJacksonValue(body));
}
/**
* Invoked only if the converter type is {@code MappingJackson2HttpMessageConverter}.
*/
protected abstract void beforeBodyWriteInternal(MappingJacksonValue bodyContainer, MediaType contentType,
MethodParameter returnType, ServerHttpRequest request, ServerHttpResponse response);
}
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