org.springframework.web.servlet.mvc.method.annotation.ResponseBodyInterceptorChain.java Source code

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Here is the source code for org.springframework.web.servlet.mvc.method.annotation.ResponseBodyInterceptorChain.java

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/*
 * 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
 *
 * 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.util.Assert;
import org.springframework.web.method.ControllerAdviceBean;

import java.util.List;

/**
 * Invokes a a list of ResponseBodyInterceptor's.
 *
 * @author Rossen Stoyanchev
 * @since 4.1
 */
class ResponseBodyInterceptorChain {

    private static Log logger = LogFactory.getLog(ResponseBodyInterceptorChain.class);

    private final List<Object> interceptors;

    public ResponseBodyInterceptorChain(List<Object> interceptors) {
        this.interceptors = interceptors;
    }

    public <T> T invoke(T body, MediaType contentType, Class<? extends HttpMessageConverter<T>> converterType,
            MethodParameter returnType, ServerHttpRequest request, ServerHttpResponse response) {

        if (this.interceptors != null) {
            if (logger.isDebugEnabled()) {
                logger.debug("Invoking ResponseBody interceptor chain for body=" + body);
            }
            for (Object interceptor : this.interceptors) {
                if (interceptor instanceof ControllerAdviceBean) {
                    ControllerAdviceBean adviceBean = (ControllerAdviceBean) interceptor;
                    if (!adviceBean.isApplicableToBeanType(returnType.getContainingClass())) {
                        continue;
                    }
                    interceptor = adviceBean.resolveBean();
                }
                Assert.state(interceptor instanceof ResponseBodyInterceptor);
                body = ((ResponseBodyInterceptor) interceptor).beforeBodyWrite(body, contentType, converterType,
                        returnType, request, response);
            }
            if (logger.isDebugEnabled()) {
                logger.debug("After interceptor chain body=" + body);
            }
        }
        return body;
    }

}