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: /**
24: * @exclude
25: */
26: public class HardObjectReference {
27:
28: public static final HardObjectReference INVALID = new HardObjectReference(
29: null, null);
30:
31: public final ObjectReference _reference;
32:
33: public final Object _object;
34:
35: public HardObjectReference(ObjectReference ref, Object obj) {
36: _reference = ref;
37: _object = obj;
38: }
39:
40: public static HardObjectReference peekPersisted(Transaction trans,
41: int id, int depth) {
42: Object obj = trans.container().peekPersisted(trans, id, depth,
43: true);
44: if (obj == null) {
45: return null;
46: }
47: ObjectReference ref = trans.referenceForId(id);
48: return new HardObjectReference(ref, obj);
49: }
50: }
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