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Java > Open Source Codes > org > apache > commons > jxpath > servlet > ServletContextHandler


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.commons.jxpath.servlet;
17
18 import java.util.Enumeration JavaDoc;
19 import java.util.HashSet JavaDoc;
20
21 import javax.servlet.ServletContext JavaDoc;
22
23 import org.apache.commons.jxpath.DynamicPropertyHandler;
24
25 /**
26  * Implementation of the DynamicPropertyHandler interface that provides
27  * access to attributes of a ServletContext.
28  *
29  * @author Dmitri Plotnikov
30  * @version $Revision: 1.6 $ $Date: 2004/05/08 15:10:49 $
31  */
32 public class ServletContextHandler implements DynamicPropertyHandler {
33     
34     private static final String JavaDoc[] STRING_ARRAY = new String JavaDoc[0];
35
36     public String JavaDoc[] getPropertyNames(Object JavaDoc context) {
37         HashSet JavaDoc list = new HashSet JavaDoc(16);
38         collectPropertyNames(list, context);
39         return (String JavaDoc[]) list.toArray(STRING_ARRAY);
40     }
41     
42     protected void collectPropertyNames(HashSet JavaDoc set, Object JavaDoc bean) {
43         Enumeration JavaDoc e = ((ServletContext JavaDoc) bean).getAttributeNames();
44         while (e.hasMoreElements()) {
45             set.add(e.nextElement());
46         }
47     }
48
49     public Object JavaDoc getProperty(Object JavaDoc context, String JavaDoc property) {
50         return ((ServletContext JavaDoc) context).getAttribute(property);
51     }
52
53     public void setProperty(Object JavaDoc context, String JavaDoc property, Object JavaDoc value) {
54         ((ServletContext JavaDoc) context).setAttribute(property, value);
55     }
56 }
57
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