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


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.Externalizable JavaDoc;
42 import java.io.IOException JavaDoc;
43 import java.io.ObjectInput JavaDoc;
44 import java.io.ObjectOutput JavaDoc;
45
46 import java.util.Vector JavaDoc;
47
48 import java.sql.ResultSetMetaData JavaDoc;
49 import java.sql.SQLException JavaDoc;
50
51 import com.quadcap.sql.types.Value;
52
53 import com.quadcap.util.Debug;
54
55 /**
56  * Constraint implementation of <b>NOT NULL</b>
57  *
58  * @author Stan Bailes
59  */
60 public class NotNullConstraint extends Constraint implements Externalizable JavaDoc {
61     public NotNullConstraint() {}
62
63     public NotNullConstraint(String JavaDoc name) {
64     super(name);
65     }
66
67     public NotNullConstraint(String JavaDoc name, Vector JavaDoc names) {
68     super(name, names);
69     }
70
71     public void add(Session session) {
72     }
73     
74     public void checkInsert(Session session, Row row)
75     throws SQLException JavaDoc, IOException JavaDoc
76     {
77     int[] cols = getColumns();
78     for (int i = 0; i < cols.length; i++) {
79         int col = cols[i];
80         if (Value.isNull(row.item(col))) {
81         throw new SQLException JavaDoc(
82             "Not null constraint violated, column " +
83             table.getColumn(col).getShortName() + " in table " +
84             table.getName(),
85             "23000");
86         }
87     }
88     }
89
90     public void applyInsert(Session session, Row row, long rowId,
91                 Constraint activeIndex)
92     throws SQLException JavaDoc, IOException JavaDoc
93     {
94     }
95
96     public void checkUpdate(Session session, byte[] oldKey, Row row,
97                             Row oldRow, long rowId, Constraint activeIndex)
98     throws SQLException JavaDoc, IOException JavaDoc
99     {
100     checkInsert(session, row);
101     }
102     
103     public void applyUpdate(Session session, byte[] oldKey, Row row,
104                 Row oldRow, long rowId, Constraint activeIndex)
105     throws SQLException JavaDoc, IOException JavaDoc
106     {
107     }
108
109     public void checkDelete(Session session, Row row, long rowId)
110     throws SQLException JavaDoc, IOException JavaDoc
111     {
112     }
113
114     public void applyDelete(Session session, Row row, long rowId,
115                 Constraint activeIndex)
116     throws SQLException JavaDoc, IOException JavaDoc
117     {
118     }
119
120     public void delete(Session session) {}
121
122     public void readExternal(ObjectInput JavaDoc in)
123     throws IOException JavaDoc, ClassNotFoundException JavaDoc
124     {
125     super.readExternal(in);
126     }
127     
128     public void writeExternal(ObjectOutput JavaDoc out) throws IOException JavaDoc {
129     super.writeExternal(out);
130     }
131
132     public void setTable(Table t) throws SQLException JavaDoc {
133         super.setTable(t);
134         int[] cols = getColumns();
135     final int notnull = ResultSetMetaData.columnNoNulls;
136         for (int i = 0; i < cols.length; i++) {
137             t.getColumn(cols[i]).setNullable(notnull);
138         }
139     }
140 }
141
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