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;
22:
23: import com.db4o.foundation.*;
24:
25: /**
26: * @exclude
27: */
28: public class ReferenceSystemRegistry {
29:
30: private final Collection4 _referenceSystems = new Collection4();
31:
32: public void removeId(final int id) {
33: removeReference(new ReferenceSource() {
34: public ObjectReference referenceFrom(
35: ReferenceSystem referenceSystem) {
36: return referenceSystem.referenceForId(id);
37: }
38: });
39: }
40:
41: public void removeObject(final Object obj) {
42: removeReference(new ReferenceSource() {
43: public ObjectReference referenceFrom(
44: ReferenceSystem referenceSystem) {
45: return referenceSystem.referenceForObject(obj);
46: }
47: });
48: }
49:
50: public void removeReference(final ObjectReference reference) {
51: removeReference(new ReferenceSource() {
52: public ObjectReference referenceFrom(
53: ReferenceSystem referenceSystem) {
54: return reference;
55: }
56: });
57: }
58:
59: private void removeReference(ReferenceSource referenceSource) {
60: Iterator4 i = _referenceSystems.iterator();
61: while (i.moveNext()) {
62: ReferenceSystem referenceSystem = (ReferenceSystem) i
63: .current();
64: ObjectReference reference = referenceSource
65: .referenceFrom(referenceSystem);
66: if (reference != null) {
67: referenceSystem.removeReference(reference);
68: }
69: }
70: }
71:
72: public void addReferenceSystem(ReferenceSystem referenceSystem) {
73: _referenceSystems.add(referenceSystem);
74: }
75:
76: public void removeReferenceSystem(ReferenceSystem referenceSystem) {
77: _referenceSystems.remove(referenceSystem);
78: }
79:
80: private static interface ReferenceSource {
81: ObjectReference referenceFrom(ReferenceSystem referenceSystem);
82: }
83: }
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