01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/protocol/RequestUserAgent.java $
03: * $Revision: 496070 $
04: * $Date: 2007-01-14 13:18:34 +0100 (Sun, 14 Jan 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.HttpRequest;
38: import org.apache.http.HttpRequestInterceptor;
39: import org.apache.http.params.HttpProtocolParams;
40:
41: /**
42: * A request interceptor that adds a User-Agent header.
43: *
44: * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
45: *
46: * @version $Revision: 496070 $
47: *
48: * @since 4.0
49: */
50: public class RequestUserAgent implements HttpRequestInterceptor {
51:
52: public RequestUserAgent() {
53: super ();
54: }
55:
56: public void process(final HttpRequest request,
57: final HttpContext context) throws HttpException,
58: IOException {
59: if (request == null) {
60: throw new IllegalArgumentException(
61: "HTTP request may not be null");
62: }
63: if (!request.containsHeader(HTTP.USER_AGENT)) {
64: String useragent = HttpProtocolParams.getUserAgent(request
65: .getParams());
66: if (useragent != null) {
67: request.addHeader(HTTP.USER_AGENT, useragent);
68: }
69: }
70: }
71:
72: }
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