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Java > Open Source Codes > com > db4o > inside > convert > conversions > ClassIndexesToBTrees_5_5


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

21 package com.db4o.inside.convert.conversions;
22
23 import com.db4o.*;
24 import com.db4o.inside.btree.*;
25 import com.db4o.inside.convert.*;
26 import com.db4o.inside.convert.ConversionStage.*;
27
28
29 /**
30  * @exclude
31  */

32 public class ClassIndexesToBTrees_5_5 extends Conversion {
33     
34     public static final int VERSION = 5;
35
36     public void convert(YapFile yapFile, int classIndexId, BTree bTree){
37         Transaction trans = yapFile.getSystemTransaction();
38         YapReader reader = yapFile.readReaderByID(trans, classIndexId);
39         if(reader == null){
40             return;
41         }
42         int entries = reader.readInt();
43         for (int i = 0; i < entries; i++) {
44             bTree.add(trans, new Integer JavaDoc(reader.readInt()));
45         }
46     }
47
48     public void convert(SystemUpStage stage) {
49         
50         // calling #storedClasses forces reading all classes
51
// That's good enough to load them all and to call the
52
// above convert method.
53

54         stage.file().storedClasses();
55     }
56 }
57
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