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Java > Open Source Codes > com > quadcap > sql > NonUniqueIndexConstraint


1 package com.quadcap.sql;
2
3 /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.io.ByteArrayOutputStream JavaDoc;
42 import java.io.Externalizable JavaDoc;
43 import java.io.IOException JavaDoc;
44 import java.io.ObjectInput JavaDoc;
45 import java.io.ObjectOutput JavaDoc;
46
47 import java.util.Vector JavaDoc;
48
49 import java.sql.ResultSet JavaDoc;
50 import java.sql.SQLException JavaDoc;
51
52 import com.quadcap.sql.io.ObjectInputStream;
53 import com.quadcap.sql.io.ObjectOutputStream;
54
55 import com.quadcap.sql.index.Btree;
56
57 import com.quadcap.sql.file.BlockFile;
58
59 import com.quadcap.sql.types.ValueInteger;
60
61 import com.quadcap.util.Debug;
62 import com.quadcap.util.Util;
63
64 /**
65  * Index constraint for indexes which do not require unique values.
66  *
67  * @author Stan Bailes
68  */
69 public class NonUniqueIndexConstraint
70     extends IndexConstraint
71     implements Externalizable JavaDoc
72 {
73     public NonUniqueIndexConstraint() {}
74
75     public NonUniqueIndexConstraint(String JavaDoc name) {
76     super(name);
77     }
78     
79     public NonUniqueIndexConstraint(String JavaDoc name, Vector JavaDoc names) {
80     super(name, names);
81     }
82
83     public void readExternal(ObjectInput JavaDoc in)
84     throws IOException JavaDoc, ClassNotFoundException JavaDoc
85     {
86     super.readExternal(in);
87     }
88     
89     public void writeExternal(ObjectOutput JavaDoc out) throws IOException JavaDoc {
90     super.writeExternal(out);
91     }
92
93     public void checkInsert(Session session, Row row)
94     throws SQLException JavaDoc, IOException JavaDoc
95     {
96     }
97
98     public byte[] makeKey(Session session, Row row, long rowId)
99     throws SQLException JavaDoc
100     {
101         byte[] key = Key.makeKey(table, row, getColumns(), rowId, true);
102         return key;
103     }
104
105     public boolean isUnique() { return false; }
106
107     public int getIndexColumnCount() {
108     return getColumnCount() + 1;
109     }
110
111     public String JavaDoc toString() {
112     return "NonUniqueIndexConstraint: " + super.toString();
113     }
114
115     public String JavaDoc constraintType() { return "non-unique index"; }
116 }
117
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