01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.selection;
18:
19: import org.apache.avalon.framework.configuration.Configuration;
20: import org.apache.avalon.framework.configuration.ConfigurationException;
21: import org.apache.avalon.framework.parameters.Parameters;
22: import org.apache.cocoon.environment.ObjectModelHelper;
23:
24: import java.util.Map;
25:
26: /**
27: * Tests a specific browser pattern against the requesting user-agent.
28: *
29: * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
30: * @author <a href="mailto:Giacomo.Pati@pwr.ch">Giacomo Pati</a>
31: * @author <a href="mailto:bloritsch@apache.org">Berin Loritsch</a>
32: * @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
33: * @version CVS $Id: BrowserSelector.java 433543 2006-08-22 06:22:54Z crossley $
34: */
35:
36: public class BrowserSelector extends NamedPatternsSelector {
37:
38: public void configure(Configuration conf)
39: throws ConfigurationException {
40: configure(conf, "browser", "name", "useragent");
41: }
42:
43: public boolean select(String expression, Map objectModel,
44: Parameters parameters) {
45: // Inform proxies that response varies with the user-agent header
46: ObjectModelHelper.getResponse(objectModel).addHeader("Vary",
47: "User-Agent");
48:
49: // Get the user-agent request header
50: String userAgent = ObjectModelHelper.getRequest(objectModel)
51: .getHeader("User-Agent");
52: if (userAgent == null) {
53: getLogger().debug("No User-Agent header -- failing.");
54: return false;
55: }
56:
57: return checkPatterns(expression, userAgent);
58: }
59: }
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