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.staging;
22:
23: import com.db4o.*;
24: import com.db4o.query.*;
25:
26: import db4ounit.*;
27: import db4ounit.extensions.*;
28:
29: // COR-471
30: public class SODAClassTypeDescend extends AbstractDb4oTestCase {
31:
32: public static class DataA {
33: public DataB _val;
34: }
35:
36: public static class DataB {
37: public DataA _val;
38: }
39:
40: public static class DataC {
41: public DataC _next;
42: }
43:
44: protected void store() throws Exception {
45: DataA objectA = new DataA();
46: DataB objectB = new DataB();
47: objectA._val = objectB;
48: objectB._val = objectA;
49: store(objectB);
50: // just to show that the descend to "_val" actually is
51: // recognized - this one doesn't show up in the result
52: store(new DataC());
53: }
54:
55: public void testFieldConstrainedToType() {
56: Query query = newQuery();
57: query.descend("_val").constrain(DataA.class);
58: ObjectSet result = query.execute();
59: Assert.areEqual(1, result.size());
60: Assert.isInstanceOf(DataB.class, result.next());
61: }
62: }
|