    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  }