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Java > Open Source Codes > smallsql > database > ForeignKeys


1 /* =============================================================
2  * SmallSQL : a free Java DBMS library for the Java(tm) platform
3  * =============================================================
4  *
5  * (C) Copyright 2004-2006, by Volker Berlin.
6  *
7  * Project Info: http://www.smallsql.de/
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ---------------
28  * ForeignKeys.java
29  * ---------------
30  * Author: Volker Berlin
31  *
32  * Created on 23.04.2005
33  */

34 package smallsql.database;
35 /**
36  * A typed implementation of Arraylist for ForeignKey.
37  *
38  * @author Volker Berlin
39  *
40  */

41 class ForeignKeys {
42     private int size;
43     private ForeignKey[] data;
44     
45     
46     ForeignKeys(){
47         data = new ForeignKey[16];
48     }
49     
50
51     final int size(){
52         return size;
53     }
54     
55
56     final ForeignKey get(int idx){
57         if (idx >= size)
58             throw new IndexOutOfBoundsException JavaDoc("Column index: "+idx+", Size: "+size);
59         return data[idx];
60     }
61     
62     
63     final void add(ForeignKey foreignKey){
64         if(size >= data.length ){
65             resize(size << 1);
66         }
67         data[size++] = foreignKey;
68     }
69     
70     
71     private final void resize(int newSize){
72         ForeignKey[] dataNew = new ForeignKey[newSize];
73         System.arraycopy(data, 0, dataNew, 0, size);
74         data = dataNew;
75     }
76 }
77
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