Source Code Cross Referenced for HostSelector.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » selection » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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:         * A <code>Selector</code> that matches a string from within the host parameter
28:         * of the HTTP request.
29:         *
30:         * <p>Configuration:
31:         * <pre>
32:         * &lt;map:selector name="host" src="org.apache.cocoon.selection.HostSelector"&gt;
33:         *   &lt;host name="uk-site" value="www.foo.co.uk"/&gt;
34:         * &lt;/map:selector&gt;
35:         * </pre>
36:         * <p>Usage:
37:         * <pre>
38:         * &lt;map:select type="host"&gt;
39:         *   &lt;map:when test="uk-site"&gt;
40:         *     &lt;map:transform src="stylesheets/page/uk.xsl"/&gt;
41:         *   &lt;/map:when&gt;
42:         *   &lt;map:otherwise&gt;
43:         *     &lt;map:transform src="stylesheets/page/us.xsl"/&gt;
44:         *   &lt;/map:otherwise&gt;
45:         * &lt;/map:select&gt;
46:         * </pre>
47:         *
48:         * @author <a href="mailto:cbritton@centervilletech.com">Colin Britton</a>
49:         * @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
50:         * @version CVS $Id: HostSelector.java 433543 2006-08-22 06:22:54Z crossley $
51:         */
52:
53:        public class HostSelector extends NamedPatternsSelector {
54:
55:            public void configure(Configuration conf)
56:                    throws ConfigurationException {
57:                configure(conf, "host", "name", "value");
58:            }
59:
60:            public boolean select(String expression, Map objectModel,
61:                    Parameters parameters) {
62:                // Inform proxies that response varies with the Host header
63:                ObjectModelHelper.getResponse(objectModel).addHeader("Vary",
64:                        "Host");
65:
66:                // Get the host request header
67:                String host = ObjectModelHelper.getRequest(objectModel)
68:                        .getHeader("Host");
69:                if (host == null) {
70:                    getLogger().debug("No Host header -- failing.");
71:                    return false;
72:                }
73:
74:                return checkPatterns(expression, host);
75:            }
76:        }