Java tutorial
/* * Copyright 2002-2018 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 * * https://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.reactive.accept; import java.util.Collections; import java.util.List; import org.springframework.http.MediaType; import org.springframework.web.server.NotAcceptableStatusException; import org.springframework.web.server.ServerWebExchange; /** * Strategy to resolve the requested media types for a {@code ServerWebExchange}. * * <p>See {@link RequestedContentTypeResolverBuilder} to create a sequence of * strategies. * * @author Rossen Stoyanchev * @since 5.0 */ public interface RequestedContentTypeResolver { /** * A singleton list with {@link MediaType#ALL} that is returned from * {@link #resolveMediaTypes} when no specific media types are requested. * @since 5.0.5 */ List<MediaType> MEDIA_TYPE_ALL_LIST = Collections.singletonList(MediaType.ALL); /** * Resolve the given request to a list of requested media types. The returned * list is ordered by specificity first and by quality parameter second. * @param exchange the current exchange * @return the requested media types, or {@link #MEDIA_TYPE_ALL_LIST} if none * were requested. * @throws NotAcceptableStatusException if the requested media type is invalid */ List<MediaType> resolveMediaTypes(ServerWebExchange exchange); }