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Java > Open Source Codes > com > db4o > inside > classindex > ClassIndexStrategy


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.classindex;
22
23 import com.db4o.*;
24 import com.db4o.foundation.*;
25
26 /**
27  * @exclude
28  */
29 public interface ClassIndexStrategy {
30     void initialize(YapStream stream);
31     void read(YapStream stream, int indexID);
32     int write(Transaction transaction);
33     void add(Transaction transaction, int id);
34     void remove(Transaction transaction, int id);
35     int entryCount(Transaction transaction);
36     int ownLength();
37     void purge();
38     
39     /**
40      * Traverses all index entries (java.lang.Integer references).
41      */
42     void traverseAll(Transaction transaction,Visitor4 command);
43     void dontDelete(Transaction transaction, int id);
44     
45     Iterator4 allSlotIDs(Transaction trans);
46     void defragReference(YapClass yapClass,ReaderPair readers,int classIndexID);
47     int id();
48     void defragIndex(ReaderPair readers);
49 }
50
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