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Java > Open Source Codes > com > db4o > test > legacy > PCollectionReferencedTwice


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 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.legacy;
22
23 import java.util.*;
24
25 import com.db4o.*;
26 import com.db4o.ext.*;
27 import com.db4o.query.*;
28 import com.db4o.test.*;
29
30
31 public class PCollectionReferencedTwice {
32     
33
34     
35     public void store(){
36         
37         Test.deleteAllInstances(this);
38         
39         ExtObjectContainer oc = Test.objectContainer();
40         
41         PCRTHolder one = new PCRTHolder();
42         
43         one._list = oc.collections().newLinkedList();
44         
45         one._list.add("Hi");
46         
47         oc.set(one);
48         
49         PCRTHolder two = new PCRTHolder();
50         
51         two._list = one._list;
52         
53         oc.set(two);
54     }
55     
56     public void test(){
57         
58         tListIdentity();
59         
60         Test.defragment();
61         
62         tListIdentity();
63         
64     }
65     
66     private void tListIdentity(){
67         ExtObjectContainer oc = Test.objectContainer();
68         
69         Query q = oc.query();
70         q.constrain(PCRTHolder.class);
71         
72         ObjectSet res = q.execute();
73         
74         Test.ensure(res.size() == 2);
75         
76         PCRTHolder one = (PCRTHolder) res.next();
77         PCRTHolder two = (PCRTHolder) res.next();
78         
79         Test.ensure(one._list == two._list);
80         
81     }
82     
83     
84     public static class PCRTHolder {
85         
86         public List _list;
87         
88     }
89     
90     
91
92 }
93
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