001/* 002 * Copyright 2002-2018 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.reactive.accept; 018 019import java.util.Collections; 020import java.util.List; 021 022import org.springframework.http.MediaType; 023import org.springframework.util.Assert; 024import org.springframework.web.server.ServerWebExchange; 025 026/** 027 * Resolver that always resolves to a fixed list of media types. This can be 028 * used as the "last in line" strategy providing a fallback for when the client 029 * has not requested any media types. 030 * 031 * @author Rossen Stoyanchev 032 * @since 5.0 033 */ 034public class FixedContentTypeResolver implements RequestedContentTypeResolver { 035 036 private final List<MediaType> contentTypes; 037 038 039 /** 040 * Constructor with a single default {@code MediaType}. 041 */ 042 public FixedContentTypeResolver(MediaType mediaType) { 043 this(Collections.singletonList(mediaType)); 044 } 045 046 /** 047 * Constructor with an ordered List of default {@code MediaType}'s to return 048 * for use in applications that support a variety of content types. 049 * <p>Consider appending {@link MediaType#ALL} at the end if destinations 050 * are present which do not support any of the other default media types. 051 */ 052 public FixedContentTypeResolver(List<MediaType> contentTypes) { 053 Assert.notNull(contentTypes, "'contentTypes' must not be null"); 054 this.contentTypes = Collections.unmodifiableList(contentTypes); 055 } 056 057 058 /** 059 * Return the configured list of media types. 060 */ 061 public List<MediaType> getContentTypes() { 062 return this.contentTypes; 063 } 064 065 066 @Override 067 public List<MediaType> resolveMediaTypes(ServerWebExchange exchange) { 068 return this.contentTypes; 069 } 070 071}