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Java > Open Source Codes > org > apache > ojb > broker > util > ObjectModification


1 package org.apache.ojb.broker.util;
2
3 /* Copyright 2002-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import java.io.Serializable JavaDoc;
19
20 /**
21  *
22  * The Interface ObjectModification represents information about
23  * modifications of persistence capable objects.
24  * Allows clients of the PersistenceBroker (e.g. a TransactionServer)
25  * to interact with the Broker in order to generate optimized SQL Statements.
26  *
27  * @author Thomas Mahler
28  * @version $Id: ObjectModification.java,v 1.6.2.2 2005/12/21 22:27:47 tomdz Exp $
29  */
30 public interface ObjectModification extends Serializable JavaDoc
31 {
32     static final long serialVersionUID = -3208237880606252967L;
33
34     /**
35      * Default implementation of this interface usable for INSERT.
36      */
37     public static final ObjectModification INSERT = new ObjectModification()
38     {
39         public boolean needsInsert()
40         {
41             return true;
42         }
43
44         public boolean needsUpdate()
45         {
46             return false;
47         }
48     };
49
50     /**
51      * Default implementation of this interface usable for UPDATE.
52      */
53     public static final ObjectModification UPDATE = new ObjectModification()
54     {
55         public boolean needsInsert()
56         {
57             return false;
58         }
59
60         public boolean needsUpdate()
61         {
62             return true;
63         }
64     };
65
66     /**
67      * Returns true if the underlying Object needs an INSERT statement.
68      * else Returns false.
69      */
70     public boolean needsInsert();
71
72     /**
73      * Returns true if the underlying Object needs an UPDATE statement.
74      * else Returns false.
75      */
76     public boolean needsUpdate();
77 }
78
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