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