1 /*
2 * Copyright 2002-2014 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.springframework.web.servlet.resource;
17
18
19 import java.io.IOException;
20 import javax.servlet.http.HttpServletRequest;
21
22 import org.springframework.core.io.Resource;
23
24 /**
25 * An abstraction for transforming the content of a resource.
26 *
27 * @author Jeremy Grelle
28 * @author Rossen Stoyanchev
29 * @since 4.1
30 */
31 public interface ResourceTransformer {
32
33 /**
34 * Transform the given resource.
35 *
36 * @param request the current request
37 * @param resource the resource to transform
38 * @param transformerChain the chain of remaining transformers to delegate to
39 * @return the transformed resource, never {@code null}
40 *
41 * @throws IOException if the transformation fails
42 */
43 Resource transform(HttpServletRequest request, Resource resource, ResourceTransformerChain transformerChain)
44 throws IOException;
45
46 }