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Java > Open Source Codes > com > db4o > inside > convert > conversions > FieldIndexesToBTrees_5_7


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.header.*;
25 import com.db4o.inside.convert.Conversion;
26 import com.db4o.inside.convert.ConversionStage.*;
27
28
29 /**
30  * @exclude
31  */
32 public class FieldIndexesToBTrees_5_7 extends Conversion{
33     
34     public static final int VERSION = 6;
35
36     public void convert(SystemUpStage stage) {
37         stage.file().classCollection().writeAllClasses();
38         rebuildUUIDIndex(stage.file());
39         freeOldUUIDMetaIndex(stage.file());
40     }
41     
42     private void rebuildUUIDIndex(YapFile file) {
43         final YapFieldUUID uuid = file.getFieldUUID();
44         final YapClassCollectionIterator i = file.classCollection().iterator();
45         while (i.moveNext()) {
46             final YapClass clazz = i.currentClass();
47             if (clazz.generateUUIDs()) {
48                 uuid.rebuildIndexForClass(file, clazz);
49             }
50         }
51     }
52
53     private void freeOldUUIDMetaIndex(YapFile file) {
54         FileHeader fh = file.getFileHeader();
55         if(! (fh instanceof FileHeader0)){
56             return;
57         }
58         final MetaIndex metaIndex = ((FileHeader0)fh).getUUIDMetaIndex();
59         if(metaIndex == null){
60             return;
61         }
62         file.free(metaIndex.indexAddress, metaIndex.indexLength);
63     }
64 }
65
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