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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.protocol;
import java.io.IOException;
import ch.boye.httpclientandroidlib.HttpException;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
import ch.boye.httpclientandroidlib.annotation.Immutable;
import ch.boye.httpclientandroidlib.params.CoreProtocolPNames;
import ch.boye.httpclientandroidlib.params.HttpParams;
import ch.boye.httpclientandroidlib.util.Args;
/**
* RequestUserAgent is responsible for adding <code>User-Agent</code> header.
* This interceptor is recommended for client side protocol processors.
*
* @since 4.0
*/
@SuppressWarnings("deprecation")
@Immutable
public class RequestUserAgent implements HttpRequestInterceptor {
private final String userAgent;
public RequestUserAgent(final String userAgent) {
super();
this.userAgent = userAgent;
}
public RequestUserAgent() {
this(null);
}
public void process(final HttpRequest request, final HttpContext context)
throws HttpException, IOException {
Args.notNull(request, "HTTP request");
if (!request.containsHeader(HTTP.USER_AGENT)) {
String s = null;
final HttpParams params = request.getParams();
if (params != null) {
s = (String) params.getParameter(CoreProtocolPNames.USER_AGENT);
}
if (s == null) {
s = this.userAgent;
}
if (s != null) {
request.addHeader(HTTP.USER_AGENT, s);
}
}
}
}
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