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.ext.*;
24:
25: /**
26: * @exclude
27: */
28: public class LazyObjectReference implements ObjectInfo {
29:
30: private final Transaction _transaction;
31:
32: private final int _id;
33:
34: public LazyObjectReference(Transaction transaction, int id) {
35: _transaction = transaction;
36: _id = id;
37: }
38:
39: public long getInternalID() {
40: return _id;
41: }
42:
43: public Object getObject() {
44: synchronized (containerLock()) {
45: return reference().getObject();
46: }
47: }
48:
49: public Db4oUUID getUUID() {
50: synchronized (containerLock()) {
51: return reference().getUUID();
52: }
53: }
54:
55: public long getVersion() {
56: synchronized (containerLock()) {
57: return reference().getVersion();
58: }
59: }
60:
61: private ObjectReference reference() {
62: final HardObjectReference hardRef = _transaction.container()
63: .getHardObjectReferenceById(_transaction, _id);
64: return hardRef._reference;
65: }
66:
67: private Object containerLock() {
68: _transaction.container().checkClosed();
69: return _transaction.container().lock();
70: }
71:
72: }
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