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Java > Open Source Codes > com > db4o > test > PeekPersisted


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;
22
23 import com.db4o.*;
24 import com.db4o.ext.*;
25 import com.db4o.query.*;
26
27
28 public class PeekPersisted {
29     
30     public String JavaDoc name;
31     
32     public PeekPersisted child;
33     
34     public void storeOne(){
35         PeekPersisted current = this;
36         current.name = "1";
37         for (int i = 2; i < 11; i++) {
38             current.child = new PeekPersisted();
39             current.child.name = "" + i;
40             current = current.child;
41         }
42     }
43     
44     public void test(){
45         Query q = Test.query();
46         q.constrain(PeekPersisted.class);
47         q.descend("name").constrain("1");
48         ObjectSet objectSet = q.execute();
49         PeekPersisted pp = (PeekPersisted)objectSet.next();
50         for (int i = 0; i < 10; i++) {
51             peek(pp, i);
52         }
53     }
54     
55     private void peek(PeekPersisted original, int depth){
56         ExtObjectContainer oc = Test.objectContainer();
57         PeekPersisted peeked = (PeekPersisted )oc.peekPersisted(original, depth, true);
58         Test.ensure(peeked != null);
59         Test.ensure(! oc.isStored(peeked));
60         for (int i = 0; i <= depth; i++) {
61             Test.ensure(peeked != null);
62             Test.ensure(! oc.isStored(peeked));
63             peeked = peeked.child;
64         }
65         Test.ensure(peeked == null);
66     }
67
68 }
69
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