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Java > Open Source Codes > org > hsqldb > ConstraintCore


1 /* Copyright (c) 1995-2000, The Hypersonic SQL Group.
2  * All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * Redistributions of source code must retain the above copyright notice, this
8  * list of conditions and the following disclaimer.
9  *
10  * Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  *
14  * Neither the name of the Hypersonic SQL Group nor the names of its
15  * contributors may be used to endorse or promote products derived from this
16  * software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
22  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  *
30  * This software consists of voluntary contributions made by many individuals
31  * on behalf of the Hypersonic SQL Group.
32  *
33  *
34  * For work added by the HSQL Development Group:
35  *
36  * Copyright (c) 2001-2005, The HSQL Development Group
37  * All rights reserved.
38  *
39  * Redistribution and use in source and binary forms, with or without
40  * modification, are permitted provided that the following conditions are met:
41  *
42  * Redistributions of source code must retain the above copyright notice, this
43  * list of conditions and the following disclaimer.
44  *
45  * Redistributions in binary form must reproduce the above copyright notice,
46  * this list of conditions and the following disclaimer in the documentation
47  * and/or other materials provided with the distribution.
48  *
49  * Neither the name of the HSQL Development Group nor the names of its
50  * contributors may be used to endorse or promote products derived from this
51  * software without specific prior written permission.
52  *
53  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
54  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56  * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
57  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
58  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
59  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
60  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
61  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
62  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
63  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64  */
65
66
67 package org.hsqldb;
68
69 import org.hsqldb.HsqlNameManager.HsqlName;
70
71 /**
72  * This class consists of the data structure for a Constraint. This
73  * structure is shared between two Constraint Objects that together form a
74  * foreign key constraint. This simplifies structural modifications to a
75  * table. When changes to the column indexes are applied to the table's
76  * Constraint Objects, they are reflected in the Constraint Objects of any
77  * other table that shares a foreign key constraint with the modified
78  * table.
79  *
80  * New class based on Hypersonic original
81  *
82  * @author Thomas Mueller (Hypersonic SQL Group)
83  * @version 1.7.1
84  * @since 1.7.1
85  */
86 class ConstraintCore {
87
88     // fkName and pkName are for foreign keys only
89 HsqlName fkName;
90     HsqlName pkName;
91
92     // iLen is the number of columns involved in the constraint.
93 // it is equal to the size of iColMain but can be smaller than the
94 // size of iColRef
95 int colLen;
96
97     // Main is the sole table in a UNIQUE constraint
98 // Or the table that is referenced by FOREIGN KEY ... REFERENCES
99 Table mainTable;
100     int[] mainColArray;
101     Index mainIndex;
102
103     // Ref is the table that has a reference to the main table
104 Table refTable;
105     int[] refColArray;
106     Index refIndex;
107     int deleteAction;
108     int updateAction;
109
110     //
111 Expression check;
112     TableFilter checkFilter;
113 }
114
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