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Java > Open Source Codes > com > sun > jdo > spi > persistence > support > sqlstore > query > util > type > NullType


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
24 /*
25  * NullType.java
26  *
27  * Created on March 8, 2000
28  */
29
30 package com.sun.jdo.spi.persistence.support.sqlstore.query.util.type;
31
32 /**
33  * This class represents the type of null.
34  *
35  * @author Michael Bouschen
36  * @version 0.1
37  */
38 public class NullType
39     extends Type
40 {
41     /**
42      *
43      */
44     NullType()
45     {
46         super("null", void.class); //NOI18N
47 }
48
49     /**
50      * An NullType object is compatible to
51      * - the errorType object
52      * - an object of type NullType (to itself)
53      * - an object of type ClassType
54      */
55     public boolean isCompatibleWith(Type type)
56     {
57         return (type.equals(TypeTable.errorType) ||
58                 (type instanceof NullType) ||
59                 (type instanceof ClassType));
60     }
61
62
63 }
64
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