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1   /* 
2    * Copyright 2002-2004 The Apache Software Foundation
3    * Licensed  under the  Apache License,  Version 2.0  (the "License");
4    * you may not use  this file  except in  compliance with the License.
5    * You may obtain a copy of the License at 
6    * 
7    *   http://www.apache.org/licenses/LICENSE-2.0
8    * 
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed  under the  License is distributed on an "AS IS" BASIS,
11   * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
12   * implied.
13   * 
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.struts.flow.core.source.impl.validity;
18  
19  import org.apache.struts.flow.core.source.SourceValidity;
20  
21  /***
22   * A validation object for time-stamps.
23   *
24   * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
25   * @version CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:17 $
26   */
27  public final class TimeStampValidity
28      implements SourceValidity
29  {
30      private long m_timeStamp;
31  
32      public TimeStampValidity( final long timeStamp )
33      {
34          m_timeStamp = timeStamp;
35      }
36  
37      /***
38       * Check if the component is still valid.
39       * If <code>0</code> is returned the isValid(SourceValidity) must be
40       * called afterwards!
41       * If -1 is returned, the component is not valid anymore and if +1
42       * is returnd, the component is valid.
43       */
44      public int isValid()
45      {
46          return 0;
47      }
48  
49      public int isValid( SourceValidity newValidity )
50      {
51          if( newValidity instanceof TimeStampValidity )
52          {
53              final long timeStamp =
54                  ( (TimeStampValidity)newValidity ).getTimeStamp();
55              return (m_timeStamp == timeStamp ? +1 : -1);
56          }
57          return -1;
58      }
59  
60      public long getTimeStamp()
61      {
62          return m_timeStamp;
63      }
64  
65      public String toString()
66      {
67          return "TimeStampValidity: " + m_timeStamp;
68      }
69  }