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28 package org.apache.http.protocol;
29
30 import java.io.IOException;
31
32 import org.apache.http.HttpException;
33 import org.apache.http.HttpRequest;
34 import org.apache.http.HttpRequestInterceptor;
35 import org.apache.http.annotation.ThreadingBehavior;
36 import org.apache.http.annotation.Contract;
37 import org.apache.http.params.CoreProtocolPNames;
38 import org.apache.http.params.HttpParams;
39 import org.apache.http.util.Args;
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46
47 @SuppressWarnings("deprecation")
48 @Contract(threading = ThreadingBehavior.IMMUTABLE)
49 public class RequestUserAgent implements HttpRequestInterceptor {
50
51 private final String userAgent;
52
53 public RequestUserAgent(final String userAgent) {
54 super();
55 this.userAgent = userAgent;
56 }
57
58 public RequestUserAgent() {
59 this(null);
60 }
61
62 @Override
63 public void process(final HttpRequest request, final HttpContext context)
64 throws HttpException, IOException {
65 Args.notNull(request, "HTTP request");
66 if (!request.containsHeader(HTTP.USER_AGENT)) {
67 String s = null;
68 final HttpParams params = request.getParams();
69 if (params != null) {
70 s = (String) params.getParameter(CoreProtocolPNames.USER_AGENT);
71 }
72 if (s == null) {
73 s = this.userAgent;
74 }
75 if (s != null) {
76 request.addHeader(HTTP.USER_AGENT, s);
77 }
78 }
79 }
80
81 }