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Java > Open Source Codes > org > springframework > web > servlet > mvc > LastModified


1 /*
2  * Copyright 2002-2006 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
17 package org.springframework.web.servlet.mvc;
18
19 import javax.servlet.http.HttpServletRequest JavaDoc;
20
21 /**
22  * Supports last-modified HTTP requests to facilitate content caching.
23  * Same contract as for the Servlet API's <code>getLastModified</code> method.
24  *
25  * <p>Delegated to by a HandlerAdapter's <code>getLastModified</code> implementation.
26  * By default, any Controller or HttpRequestHandler within Spring's default framework
27  * can implement this interface to enable last-modified checking.
28  *
29  * @author Rod Johnson
30  * @author Juergen Hoeller
31  * @see javax.servlet.http.HttpServlet#getLastModified
32  * @see Controller
33  * @see SimpleControllerHandlerAdapter
34  * @see org.springframework.web.HttpRequestHandler
35  * @see HttpRequestHandlerAdapter
36  */

37 public interface LastModified {
38     
39     /**
40      * Same contract as for HttpServlet's <code>getLastModified</code> method.
41      * Invoked <b>before</b> request processing.
42      * <p>The return value will be sent to the HTTP client as Last-Modified header,
43      * and compared with If-Modified-Since headers that the client sends back.
44      * The content will only get regenerated if there has been a modification.
45      * @param request current HTTP request
46      * @return the time the underlying resource was last modified, or -1
47      * meaning that the content must always be regenerated
48      * @see org.springframework.web.servlet.HandlerAdapter#getLastModified
49      * @see javax.servlet.http.HttpServlet#getLastModified
50      */

51     long getLastModified(HttpServletRequest JavaDoc request);
52     
53 }
54
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