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.db4ounit.common.soda;
22:
23: import com.db4o.query.Query;
24:
25: import db4ounit.Assert;
26: import db4ounit.extensions.AbstractDb4oTestCase;
27:
28: public class NullIdentityConstraintTestCase extends
29: AbstractDb4oTestCase {
30:
31: public static class Data {
32: public Data _prev;
33:
34: public Data(Data prev) {
35: this ._prev = prev;
36: }
37: }
38:
39: protected void store() throws Exception {
40: Data a = new Data(null);
41: Data b = new Data(a);
42: store(b);
43: }
44:
45: public void testNullIdentity() {
46: Query query = newQuery(Data.class);
47: query.descend("_prev").constrain(null).identity();
48: Assert.areEqual(1, query.execute().size());
49: }
50: }
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