1 /*
2 * $Id: SessionScopeExtractor.java 1199216 2011-11-08 12:25:24Z mck $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.tiles.request.servlet.extractor;
22
23 import java.util.Enumeration;
24 import java.util.Collections;
25
26 import javax.servlet.http.HttpServletRequest;
27 import javax.servlet.http.HttpSession;
28
29 import org.apache.tiles.request.attribute.AttributeExtractor;
30
31 /**
32 * Extract attributes from session scope.
33 *
34 * @version $Rev: 1199216 $ $Date: 2011-11-08 23:25:24 +1100 (Tue, 08 Nov 2011) $
35 */
36 public class SessionScopeExtractor implements AttributeExtractor {
37
38 /**
39 * The servlet request.
40 */
41 private HttpServletRequest request;
42
43 /**
44 * Constructor.
45 *
46 * @param request The servlet request.
47 */
48 public SessionScopeExtractor(HttpServletRequest request) {
49 this.request = request;
50 }
51
52 @Override
53 public void setValue(String name, Object value) {
54 request.getSession().setAttribute(name, value);
55 }
56
57 @Override
58 public void removeValue(String name) {
59 HttpSession session = request.getSession(false);
60 if (session != null) {
61 session.removeAttribute(name);
62 }
63 }
64
65 @SuppressWarnings("unchecked")
66 @Override
67 public Enumeration<String> getKeys() {
68 HttpSession session = request.getSession(false);
69 if (session != null) {
70 return session.getAttributeNames();
71 }
72 return Collections.enumeration(Collections.<String>emptySet());
73 }
74
75 @Override
76 public Object getValue(String key) {
77 HttpSession session = request.getSession(false);
78 if (session != null) {
79 return session.getAttribute(key);
80 }
81 return null;
82 }
83 }