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Java > Open Source Codes > com > sun > enterprise > admin > util > BaseValidator


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23 package com.sun.enterprise.admin.util;
24
25 import com.sun.enterprise.admin.util.Validator;
26
27 // JDK includes
28 import java.io.Serializable JavaDoc;
29
30
31 /**
32     Optional base class for all implementations of IValidator.
33  */
34 public class BaseValidator implements Validator, Serializable JavaDoc
35 {
36     private final static String JavaDoc kMustBeNonNull =
37                                                     "object must be non-null";
38
39     private static final BaseValidator sInstance = new BaseValidator();
40     
41     /**
42         Validate the object by checking for non-null. It is expected
43         that subclasses will override this behavior but may invoke
44         super.validate() to make this check.
45
46         @param object the object to validate (check for non-null)
47         @returns a ValidatorResult indicating the validity
48      */
49     public ValidatorResult validate( Object JavaDoc object )
50     {
51             ValidatorResult result = ValidatorResult.kValid;
52
53             if ( object == null )
54             {
55                 result = new ValidatorResult( false, kMustBeNonNull );
56             }
57
58             return( result );
59     }
60     
61     /**
62         A convenience for any client that needs the default object Validator
63         (which never changes). It could be used, for example, to invoke
64         getInstance().validate( object ).
65      */
66     public static Validator getInstance()
67     {
68         return( sInstance );
69     }
70 }
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