001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.jxpath.servlet;
018
019 import java.util.Enumeration;
020 import java.util.HashSet;
021 import javax.servlet.http.HttpSession;
022
023 import org.apache.commons.jxpath.JXPathException;
024
025 /**
026 * Implementation of the {@link org.apache.commons.jxpath.DynamicPropertyHandler}
027 * interface that provides access to attributes of a @{link HttpSession}.
028 *
029 * @author Dmitri Plotnikov
030 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
031 */
032 public class HttpSessionHandler extends ServletContextHandler {
033
034 protected void collectPropertyNames(HashSet set, Object bean) {
035 HttpSessionAndServletContext handle =
036 (HttpSessionAndServletContext) bean;
037 super.collectPropertyNames(set, handle.getServletContext());
038 HttpSession session = handle.getSession();
039 if (session != null) {
040 Enumeration e = session.getAttributeNames();
041 while (e.hasMoreElements()) {
042 set.add(e.nextElement());
043 }
044 }
045 }
046
047 public Object getProperty(Object bean, String property) {
048 HttpSessionAndServletContext handle =
049 (HttpSessionAndServletContext) bean;
050 HttpSession session = handle.getSession();
051 if (session != null) {
052 Object object = session.getAttribute(property);
053 if (object != null) {
054 return object;
055 }
056 }
057 return super.getProperty(handle.getServletContext(), property);
058 }
059
060 public void setProperty(Object bean, String property, Object value) {
061 HttpSessionAndServletContext handle =
062 (HttpSessionAndServletContext) bean;
063 HttpSession session = handle.getSession();
064 if (session != null) {
065 session.setAttribute(property, value);
066 }
067 else {
068 throw new JXPathException("Cannot set session attribute: "
069 + "there is no session");
070 }
071 }
072 }