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Java > Open Source Codes > org > apache > excalibur > source > impl > validity > TimeStampValidity


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.excalibur.source.impl.validity;
18
19 import org.apache.excalibur.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 JavaDoc toString()
66     {
67         return "TimeStampValidity: " + m_timeStamp;
68     }
69 }
70
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