XSPSessionHelper


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.cocoon.components.language.markup.xsp;
17  
18  import org.apache.cocoon.environment.Session;
19  
20  import java.util.ArrayList  ;
21  import java.util.Enumeration  ;
22  import java.util.List  ;
23  
24  /**
25   * The <code>Session</code> object helper
26   *
27   * @author <a HREF="mailto:ricardo@apache.org">Ricardo Rocha</a>
28   * @author <a HREF="mailto:vgritsenko@apache.org">Vadim Gritsenko</a>
29   * @version CVS $Id: XSPSessionHelper.java 30932 2004-07-29 17:35:38Z vgritsenko $
30   */
31  public class XSPSessionHelper {
32  
33      /**
34       * Return the given session attribute value or a user-provided default if
35       * none was specified.
36       *
37       * @param session The Session object
38       * @param name The parameter name
39       * @param defaultValue Value to substitute in absence of a parameter value
40       */
41      public static Object   getSessionAttribute(Session session, String   name,
42                                               Object   defaultValue) {
43          Object   value = null;
44          if (session != null) {
45              value = session.getAttribute(name);
46          }
47  
48          if (value == null) {
49              value = defaultValue;
50          }
51  
52          return value;
53      }
54  
55      /**
56       * Get the session attribute names.
57       *
58       * @param session The Session object
59       */
60      public static List   getSessionAttributeNames(Session session) {
61          ArrayList   v = new ArrayList  ();
62          if (session == null) {
63              return v;
64          }
65          Enumeration   e = session.getAttributeNames();
66          while (e.hasMoreElements()) {
67              v.add(e.nextElement());
68          }
69          return v;
70      }
71  }
72
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