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Java > Open Source Codes > org > apache > cocoon > matching > WildcardRequestAttributeMatcher


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.cocoon.matching;
17
18 import org.apache.avalon.framework.configuration.Configurable;
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
23 import org.apache.cocoon.environment.ObjectModelHelper;
24
25 import java.util.Map JavaDoc;
26
27 /**
28  * Matches a request attribute against a wildcard expression.
29  *
30  * <p><b>Global and local configuration</b></p>
31  * <tableborder="1">
32  * <tr><td><code>attribute-name</code></td><td>String identifying the request attribute</td></tr>
33  * </table>
34  *
35  * @author <a HREF="mailto:haul@apache.org">Christian Haul</a>
36  * @author <a HREF="mailto:sylvain@apache.org">Sylvain Wallez</a>
37  * @author <a HREF="mailto:vgritsenko@apache.org">Vadim Gritsenko</a>
38  * @version CVS $Id: WildcardRequestAttributeMatcher.java 30932 2004-07-29 17:35:38Z vgritsenko $
39  */
40 public class WildcardRequestAttributeMatcher extends AbstractWildcardMatcher
41     implements Configurable
42 {
43     private String JavaDoc defaultParam;
44
45     public void configure(Configuration config) throws ConfigurationException {
46         this.defaultParam = config.getChild("attribute-name").getValue(null);
47         if (getLogger().isDebugEnabled()) {
48             getLogger().debug("Default attribute-name is = '" + this.defaultParam + "'");
49         }
50     }
51
52     protected String JavaDoc getMatchString(Map JavaDoc objectModel, Parameters parameters) {
53
54         String JavaDoc paramName = parameters.getParameter("attribute-name", this.defaultParam);
55         if (paramName == null) {
56             getLogger().warn("No attribute name given. FAILING");
57             return null;
58         }
59
60         Object JavaDoc result = ObjectModelHelper.getRequest(objectModel).getAttribute(paramName);
61         if (result == null) {
62             getLogger().debug("Request attribute '" + paramName + "' not set.");
63             return null;
64         }
65
66         return result.toString();
67     }
68 }
69
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