/*
* Copyright 2002-2015 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
*
* http://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.io.IOException;
import java.lang.reflect.Type;
import com.fasterxml.jackson.annotation.JsonView;
import org.springframework.core.MethodParameter;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter;
import org.springframework.http.converter.json.MappingJacksonInputMessage;
/**
* A {@link RequestBodyAdvice} implementation that adds support for Jackson's
* {@code @JsonView} annotation declared on a Spring MVC {@code @HttpEntity}
* or {@code @RequestBody} method parameter.
*
* <p>The deserialization view specified in the annotation will be passed in to the
* {@link org.springframework.http.converter.json.MappingJackson2HttpMessageConverter}
* which will then use it to deserialize the request body with.
*
* <p>Note that despite {@code @JsonView} allowing for more than one class to
* be specified, the use for a request body advice is only supported with
* exactly one class argument. Consider the use of a composite interface.
*
* <p>Jackson 2.5 or later is required for parameter-level use of {@code @JsonView}.
*
* @author Sebastien Deleuze
* @since 4.2
* @see com.fasterxml.jackson.annotation.JsonView
* @see com.fasterxml.jackson.databind.ObjectMapper#readerWithView(Class)
*/
public class JsonViewRequestBodyAdvice extends RequestBodyAdviceAdapter {
@Override
public boolean supports(MethodParameter methodParameter, Type targetType,
Class<? extends HttpMessageConverter<?>> converterType) {
return (AbstractJackson2HttpMessageConverter.class.isAssignableFrom(converterType) &&
methodParameter.getParameterAnnotation(JsonView.class) != null);
}
@Override
public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter methodParameter,
Type targetType, Class<? extends HttpMessageConverter<?>> selectedConverterType) throws IOException {
JsonView annotation = methodParameter.getParameterAnnotation(JsonView.class);
Class<?>[] classes = annotation.value();
if (classes.length != 1) {
throw new IllegalArgumentException(
"@JsonView only supported for request body advice with exactly 1 class argument: " + methodParameter);
}
return new MappingJacksonInputMessage(inputMessage.getBody(), inputMessage.getHeaders(), classes[0]);
}
}