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Java > Open Source Codes > smallsql > database > StorePageLink


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  * StorePageLink.java
29  * ---------------
30  * Author: Volker Berlin
31  *
32  * Created on 09.08.2004
33  */
34 package smallsql.database;
35
36 /**
37  * This class is a reference to a StorePage. The link can point to a uncommited StorePage in Memory
38  * or it can link to a filepos.
39  *
40  * @author Volker Berlin
41  */
42 class StorePageLink {
43     long filePos;
44     TableStorePage page;
45     
46     StoreImpl getStore(Table table, SSConnection con, int lock) throws Exception JavaDoc{
47         TableStorePage page = this.page;
48         if(page == null)
49             return table.getStore( con, filePos, lock );
50         while(page.nextLock != null) page = page.nextLock;
51         return table.getStore( page, lock);
52     }
53 }
54
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