001/* 002 * Copyright 2002-2015 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.accept; 018 019import java.util.Collections; 020import java.util.List; 021 022import org.apache.commons.logging.Log; 023import org.apache.commons.logging.LogFactory; 024 025import org.springframework.http.MediaType; 026import org.springframework.web.context.request.NativeWebRequest; 027 028/** 029 * A {@code ContentNegotiationStrategy} that returns a fixed content type. 030 * 031 * @author Rossen Stoyanchev 032 * @since 3.2 033 */ 034public class FixedContentNegotiationStrategy implements ContentNegotiationStrategy { 035 036 private static final Log logger = LogFactory.getLog(FixedContentNegotiationStrategy.class); 037 038 private final List<MediaType> contentType; 039 040 041 /** 042 * Create an instance with the given content type. 043 */ 044 public FixedContentNegotiationStrategy(MediaType contentType) { 045 this.contentType = Collections.singletonList(contentType); 046 } 047 048 049 @Override 050 public List<MediaType> resolveMediaTypes(NativeWebRequest request) { 051 if (logger.isDebugEnabled()) { 052 logger.debug("Requested media types: " + this.contentType); 053 } 054 return this.contentType; 055 } 056 057}