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


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 java.io.File JavaDoc;
20
21 import org.apache.excalibur.source.SourceValidity;
22
23 /**
24  * A validation object for time-stamps.
25  *
26  * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
27  * @version CVS $Revision: 1.4 $
28  */
29 public final class FileTimeStampValidity
30     implements SourceValidity
31 {
32     private long m_timeStamp;
33     private File JavaDoc m_file;
34
35     public FileTimeStampValidity( final String JavaDoc filename )
36     {
37         this( new File JavaDoc( filename ) );
38     }
39
40     public FileTimeStampValidity( final File JavaDoc file )
41     {
42         this( file, file.lastModified() );
43     }
44
45     public FileTimeStampValidity( final File JavaDoc file,
46                                   final long timeStamp )
47     {
48         m_file = file;
49         m_timeStamp = timeStamp;
50     }
51
52     /**
53      * Check if the component is still valid.
54      * If <code>0</code> is returned the isValid(SourceValidity) must be
55      * called afterwards!
56      * If -1 is returned, the component is not valid anymore and if +1
57      * is returnd, the component is valid.
58      */
59     public int isValid()
60     {
61         return ( m_file.lastModified() == m_timeStamp ? 1 : -1 );
62     }
63
64     public int isValid( final SourceValidity newValidity )
65     {
66         if( newValidity instanceof FileTimeStampValidity )
67         {
68             final long timeStamp =
69                 ( (FileTimeStampValidity)newValidity ).getTimeStamp();
70             return ( m_timeStamp == timeStamp ? 1 : -1);
71         }
72         return -1;
73     }
74
75     public File JavaDoc getFile()
76     {
77         return this.m_file;
78     }
79
80     public long getTimeStamp()
81     {
82         return this.m_timeStamp;
83     }
84
85     public String JavaDoc toString()
86     {
87         return "FileTimeStampValidity: " + m_file.getPath() + ": " + this.m_timeStamp;
88     }
89 }
90
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