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Java > Open Source Codes > com > sleepycat > persist > model > Relationship


1 /*-
2  * See the file LICENSE for redistribution information.
3  *
4  * Copyright (c) 2002,2006 Oracle. All rights reserved.
5  *
6  * $Id: Relationship.java,v 1.4 2006/10/30 21:14:33 bostic Exp $
7  */
8
9 package com.sleepycat.persist.model;
10
11 /**
12  * Defines the relationship between instances of the entity class and the
13  * secondary keys. This can be specified using a {@link SecondaryKey#relate}
14  * annotation.
15  *
16  * @author Mark Hayes
17  */
18 public enum Relationship {
19
20     /**
21      * Relates many entities to one secondary key.
22      *
23      * <p>The secondary index will have non-unique keys; in other words,
24      * duplicates will be allowed.</p>
25      *
26      * <p>The secondary key field is singular, in other words, it may not be an
27      * array or collection type.</p>
28      */
29     MANY_TO_ONE,
30
31     /**
32      * Relates one entity to many secondary keys.
33      *
34      * <p>The secondary index will have unique keys, in other words, duplicates
35      * will not be allowed.</p>
36      *
37      * <p>The secondary key field must be an array or collection type.</p>
38      */
39     ONE_TO_MANY,
40
41     /**
42      * Relates many entities to many secondary keys.
43      *
44      * <p>The secondary index will have non-unique keys, in other words,
45      * duplicates will be allowed.</p>
46      *
47      * <p>The secondary key field must be an array or collection type.</p>
48      */
49     MANY_TO_MANY,
50
51     /**
52      * Relates one entity to one secondary key.
53      *
54      * <p>The secondary index will have unique keys, in other words, duplicates
55      * will not be allowed.</p>
56      *
57      * <p>The secondary key field is singular, in other words, it may not be an
58      * array or collection type.</p>
59      */
60     ONE_TO_ONE;
61 }
62
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