01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: 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.internal.classindex;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25:
26: /**
27: * @exclude
28: */
29: public interface ClassIndexStrategy {
30: void initialize(ObjectContainerBase stream);
31:
32: void read(ObjectContainerBase stream, int indexID);
33:
34: int write(Transaction transaction);
35:
36: void add(Transaction transaction, int id);
37:
38: void remove(Transaction transaction, int id);
39:
40: int entryCount(Transaction transaction);
41:
42: int ownLength();
43:
44: void purge();
45:
46: /**
47: * Traverses all index entries (java.lang.Integer references).
48: */
49: void traverseAll(Transaction transaction, Visitor4 command);
50:
51: void dontDelete(Transaction transaction, int id);
52:
53: Iterator4 allSlotIDs(Transaction trans);
54:
55: // FIXME: Why is this never called?
56: void defragReference(ClassMetadata yapClass, BufferPair readers,
57: int classIndexID);
58:
59: int id();
60:
61: // FIXME: Why is this never called?
62: void defragIndex(BufferPair readers);
63: }
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