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1   package org.apache.turbine.modules.actions.sessionvalidator;
2   
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  
22  import org.apache.turbine.modules.Action;
23  
24  /***
25   * The SessionValidator attempts to retrive the User object from the
26   * Servlet API session that is associated with the request.  If the
27   * data cannot be retrieved, it is handled here.  If the user has not
28   * been marked as being logged into the system, the user is rejected
29   * and the screen is set to the screen.homepage value in
30   * TurbineResources.properties.
31   *
32   * <p>
33   *
34   * Other systems generally have a database table which stores this
35   * information, but we take advantage of the Servlet API here to save
36   * a hit to the database for each and every connection that a user
37   * makes.
38   *
39   * <p>
40   *
41   * This action is special in that it should only be executed by the
42   * Turbine servlet.
43   *
44   * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
45   * @version $Id: SessionValidator.java 534527 2007-05-02 16:10:59Z tv $
46   */
47  public abstract class SessionValidator extends Action
48  {
49  }