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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     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.commons.jxpath.servlet;
18  
19  import java.util.Enumeration;
20  import java.util.HashSet;
21  import javax.servlet.http.HttpSession;
22  
23  import org.apache.commons.jxpath.JXPathException;
24  
25  /**
26   * Implementation of the {@link org.apache.commons.jxpath.DynamicPropertyHandler}
27   * interface that provides access to attributes of a @{link HttpSession}.
28   *
29   * @author Dmitri Plotnikov
30   * @version $Revision: 652845 $ $Date: 2008-05-02 13:46:46 -0400 (Fri, 02 May 2008) $
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  }