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.*;
24: import com.db4o.internal.*;
25:
26: /**
27: * @exclude
28: */
29: public abstract class AbstractClassIndexStrategy implements
30: ClassIndexStrategy {
31:
32: protected final ClassMetadata _yapClass;
33:
34: public AbstractClassIndexStrategy(ClassMetadata yapClass) {
35: _yapClass = yapClass;
36: }
37:
38: protected int yapClassID() {
39: return _yapClass.getID();
40: }
41:
42: public int ownLength() {
43: return Const4.ID_LENGTH;
44: }
45:
46: protected abstract void internalAdd(Transaction trans, int id);
47:
48: public final void add(Transaction trans, int id) {
49: if (DTrace.enabled) {
50: DTrace.ADD_TO_CLASS_INDEX.log(id);
51: }
52: checkId(id);
53: internalAdd(trans, id);
54: }
55:
56: protected abstract void internalRemove(Transaction ta, int id);
57:
58: public final void remove(Transaction ta, int id) {
59: if (DTrace.enabled) {
60: DTrace.REMOVE_FROM_CLASS_INDEX.log(id);
61: }
62: checkId(id);
63: internalRemove(ta, id);
64: }
65:
66: private void checkId(int id) {
67: if (Deploy.debug) {
68: if (id == 0) {
69: throw new IllegalArgumentException("id can't be zero");
70: }
71: }
72: }
73: }
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