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.test;
22:
23: import java.util.*;
24:
25: import com.db4o.*;
26: import com.db4o.query.*;
27:
28: public class CollectionSubQuery {
29: private final static String ID = "X";
30:
31: public static class Data {
32: public String id;
33:
34: public Data(String id) {
35: this .id = id;
36: }
37: }
38:
39: public List list;
40:
41: public void storeOne() {
42: this .list = new ArrayList();
43: this .list.add(new Data(ID));
44: }
45:
46: public void test() {
47: Query q = Test.query();
48: q.constrain(CollectionSubQuery.class);
49: Query sub = q.descend("list");
50: // Commenting out this constraint doesn't effect behavior
51: sub.constrain(Data.class);
52: // If this subsub constraint is commented out, the result
53: // contains a Data instance as expected. With this constraint,
54: // we get the containing ArrayList.
55: Query subsub = sub.descend("id");
56: subsub.constrain(ID);
57: ObjectSet result = sub.execute();
58: Test.ensure(result.size() == 1);
59: Test.ensure(result.next().getClass() == Data.class);
60: }
61:
62: public static void main(String[] args) {
63: AllTests.run(CollectionSubQuery.class);
64: }
65: }
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