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Java > Open Source Codes > com > db4o > inside > mapping > DefragContext


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.mapping;
22
23 import com.db4o.*;
24 import com.db4o.foundation.*;
25 import com.db4o.inside.btree.*;
26
27 /**
28  * Encapsulates services involving source and target database files during defragmenting.
29  *
30  * @exclude
31  */
32 public interface DefragContext extends IDMapping {
33     
34     YapReader sourceReaderByAddress(int address,int length);
35     YapReader targetReaderByAddress(int address,int length);
36
37     YapReader sourceReaderByID(int sourceID);
38
39     int allocateTargetSlot(int targetLength);
40
41     void targetWriteBytes(YapReader targetPointerReader, int targetID);
42
43     Transaction systemTrans();
44
45     void targetWriteBytes(ReaderPair readers, int targetAddress);
46
47     void traverseAllIndexSlots(BTree tree, Visitor4 visitor4);
48     
49     YapClass yapClass(int id);
50
51     YapWriter sourceWriterByID(int sourceID);
52     
53     int mappedID(int id,boolean lenient);
54
55     void registerUnindexed(int id);
56     
57     Iterator4 unindexedIDs();
58 }
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