01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/protocol/ResponseDate.java $
03: * $Revision: 555989 $
04: * $Date: 2007-07-13 15:33:39 +0200 (Fri, 13 Jul 2007) $
05: *
06: * ====================================================================
07: * Licensed to the Apache Software Foundation (ASF) under one
08: * or more contributor license agreements. See the NOTICE file
09: * distributed with this work for additional information
10: * regarding copyright ownership. The ASF licenses this file
11: * to you under the Apache License, Version 2.0 (the
12: * "License"); you may not use this file except in compliance
13: * with the License. You may obtain a copy of the License at
14: *
15: * http://www.apache.org/licenses/LICENSE-2.0
16: *
17: * Unless required by applicable law or agreed to in writing,
18: * software distributed under the License is distributed on an
19: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20: * KIND, either express or implied. See the License for the
21: * specific language governing permissions and limitations
22: * under the License.
23: * ====================================================================
24: *
25: * This software consists of voluntary contributions made by many
26: * individuals on behalf of the Apache Software Foundation. For more
27: * information on the Apache Software Foundation, please see
28: * <http://www.apache.org/>.
29: *
30: */
31:
32: package org.apache.http.protocol;
33:
34: import java.io.IOException;
35:
36: import org.apache.http.HttpException;
37: import org.apache.http.HttpResponse;
38: import org.apache.http.HttpResponseInterceptor;
39: import org.apache.http.HttpStatus;
40:
41: /**
42: * A response interceptor that adds a Date header.
43: * For use on the server side.
44: *
45: * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
46: *
47: * @version $Revision: 555989 $
48: *
49: * @since 4.0
50: */
51: public class ResponseDate implements HttpResponseInterceptor {
52:
53: private static final HttpDateGenerator DATE_GENERATOR = new HttpDateGenerator();
54:
55: public ResponseDate() {
56: super ();
57: }
58:
59: public void process(final HttpResponse response,
60: final HttpContext context) throws HttpException,
61: IOException {
62: if (response == null) {
63: throw new IllegalArgumentException(
64: "HTTP response may not be null.");
65: }
66: int status = response.getStatusLine().getStatusCode();
67: if ((status >= HttpStatus.SC_OK)
68: && !response.containsHeader(HTTP.DATE_HEADER)) {
69: String httpdate = DATE_GENERATOR.getCurrentDate();
70: response.setHeader(HTTP.DATE_HEADER, httpdate);
71: }
72: }
73:
74: }
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