001/* 002 * Copyright 2002-2016 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.resource; 018 019import reactor.core.publisher.Mono; 020 021import org.springframework.core.io.Resource; 022import org.springframework.web.server.ServerWebExchange; 023 024/** 025 * An abstraction for transforming the content of a resource. 026 * 027 * @author Rossen Stoyanchev 028 * @since 5.0 029 */ 030@FunctionalInterface 031public interface ResourceTransformer { 032 033 /** 034 * Transform the given resource. 035 * @param exchange the current exchange 036 * @param resource the resource to transform 037 * @param transformerChain the chain of remaining transformers to delegate to 038 * @return the transformed resource (never empty) 039 */ 040 Mono<Resource> transform(ServerWebExchange exchange, Resource resource, 041 ResourceTransformerChain transformerChain); 042 043}