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.freespace;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25: import com.db4o.internal.slots.*;
26:
27: /**
28: * @exclude
29: */
30: public abstract class SlotHandler implements Indexable4 {
31:
32: protected Slot _current;
33:
34: public void defragIndexEntry(BufferPair readers) {
35: throw new NotImplementedException();
36: }
37:
38: public int linkLength() {
39: return Slot.MARSHALLED_LENGTH;
40: }
41:
42: public Object readIndexEntry(Buffer reader) {
43: return new Slot(reader.readInt(), reader.readInt());
44: }
45:
46: public void writeIndexEntry(Buffer writer, Object obj) {
47: Slot slot = (Slot) obj;
48: writer.writeInt(slot.address());
49: writer.writeInt(slot.length());
50: }
51:
52: public Comparable4 prepareComparison(Object obj) {
53: _current = (Slot) obj;
54: return this;
55: }
56:
57: }
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