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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;
19  import java.util.HashSet;
20  
21  import javax.servlet.http.HttpSession;
22  
23  import org.apache.commons.jxpath.JXPathException;
24  
25  /***
26   * Implementation of the DynamicPropertyHandler interface that provides
27   * access to attributes of a HttpSession.
28   *
29   * @author Dmitri Plotnikov
30   * @version $Revision: 1.6 $ $Date: 2004/05/08 15:10:49 $
31   */
32  public class HttpSessionHandler extends ServletContextHandler {
33  
34      protected void collectPropertyNames(HashSet set, Object bean) {
35          HttpSessionAndServletContext handle = 
36              (HttpSessionAndServletContext) bean;
37          super.collectPropertyNames(set, handle.getServletContext());
38          HttpSession session = handle.getSession();
39          if (session != null) {
40              Enumeration e = session.getAttributeNames();
41              while (e.hasMoreElements()) {
42                  set.add(e.nextElement());
43              }
44          }
45      }
46      
47      public Object getProperty(Object bean, String property) {
48          HttpSessionAndServletContext handle = 
49              (HttpSessionAndServletContext) bean;
50          HttpSession session = handle.getSession();
51          if (session != null) {
52              Object object = session.getAttribute(property);
53              if (object != null) {
54                  return object;
55              }
56          }
57          return super.getProperty(handle.getServletContext(), property);
58      }
59  
60      public void setProperty(Object bean, String property, Object value) {
61          HttpSessionAndServletContext handle = 
62              (HttpSessionAndServletContext) bean;
63          HttpSession session = handle.getSession();
64          if (session != null) {
65              session.setAttribute(property, value);
66          }
67          else {
68              throw new JXPathException("Cannot set session attribute: "
69                      + "there is no session");
70          }
71      }
72  }