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.web.server.NotAcceptableStatusException; 024import org.springframework.web.server.ServerWebExchange; 025 026/** 027 * Strategy to resolve the requested media types for a {@code ServerWebExchange}. 028 * 029 * <p>See {@link RequestedContentTypeResolverBuilder} to create a sequence of 030 * strategies. 031 * 032 * @author Rossen Stoyanchev 033 * @since 5.0 034 */ 035public interface RequestedContentTypeResolver { 036 037 /** 038 * A singleton list with {@link MediaType#ALL} that is returned from 039 * {@link #resolveMediaTypes} when no specific media types are requested. 040 * @since 5.0.5 041 */ 042 List<MediaType> MEDIA_TYPE_ALL_LIST = Collections.singletonList(MediaType.ALL); 043 044 045 /** 046 * Resolve the given request to a list of requested media types. The returned 047 * list is ordered by specificity first and by quality parameter second. 048 * @param exchange the current exchange 049 * @return the requested media types, or {@link #MEDIA_TYPE_ALL_LIST} if none 050 * were requested. 051 * @throws NotAcceptableStatusException if the requested media type is invalid 052 */ 053 List<MediaType> resolveMediaTypes(ServerWebExchange exchange); 054 055}