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.servlet.resource; 018 019import java.io.IOException; 020 021import javax.servlet.http.HttpServletRequest; 022 023import org.springframework.core.io.Resource; 024 025/** 026 * An abstraction for transforming the content of a resource. 027 * 028 * @author Jeremy Grelle 029 * @author Rossen Stoyanchev 030 * @since 4.1 031 */ 032@FunctionalInterface 033public interface ResourceTransformer { 034 035 /** 036 * Transform the given resource. 037 * @param request the current request 038 * @param resource the resource to transform 039 * @param transformerChain the chain of remaining transformers to delegate to 040 * @return the transformed resource (never {@code null}) 041 * @throws IOException if the transformation fails 042 */ 043 Resource transform(HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain) 044 throws IOException; 045 046}