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 com.db4o.*;
24: import com.db4o.ext.*;
25: import com.db4o.query.*;
26:
27: public class DeleteDeep {
28:
29: public String name;
30:
31: public DeleteDeep child;
32:
33: public void storeOne() {
34: addNodes(10);
35: name = "root";
36: }
37:
38: private void addNodes(int count) {
39: if (count > 0) {
40: child = new DeleteDeep();
41: child.name = "" + count;
42: child.addNodes(count - 1);
43: }
44: }
45:
46: public void test() {
47: ObjectContainer objectContainer = Test.objectContainer();
48: Query q = objectContainer.query();
49: q.constrain(DeleteDeep.class);
50: q.descend("name").constrain("root");
51: DeleteDeep root = (DeleteDeep) q.execute().next();
52: objectContainer.activate(root, Integer.MAX_VALUE);
53:
54: deleteDeep(objectContainer, root);
55:
56: objectContainer.commit();
57: Test.ensureOccurrences(DeleteDeep.class, 0);
58: }
59:
60: private void deleteDeep(ObjectContainer objectContainer, Object obj) {
61: ObjectContainer allToDelete = ExtDb4o.openMemoryFile(null);
62: allToDelete.set(obj);
63: ObjectSet objectSet = allToDelete.get(null);
64: while (objectSet.hasNext()) {
65: objectContainer.delete(objectSet.next());
66: }
67: allToDelete.close();
68: }
69:
70: }
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