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


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 which is always valid.
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 NOPValidity
28     implements SourceValidity
29 {
30     public static final SourceValidity SHARED_INSTANCE = new NOPValidity();
31
32     /**
33      * Check if the component is still valid.
34      * If <code>0</code> is returned the isValid(SourceValidity) must be
35      * called afterwards!
36      * If -1 is returned, the component is not valid anymore and if +1
37      * is returnd, the component is valid.
38      */
39     public int isValid()
40     {
41         return 1;
42     }
43
44     public int isValid( final SourceValidity newValidity )
45     {
46         if (newValidity instanceof NOPValidity)
47         {
48             return 1;
49         }
50         return -1;
51     }
52
53     public String JavaDoc toString()
54     {
55         return "NOPValidity";
56     }
57 }
58
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