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.foundation;
22:
23: /**
24: * @exclude
25: */
26: public class Collection4Iterator extends Iterator4Impl {
27:
28: private final Collection4 _collection;
29: private final int _initialVersion;
30:
31: public Collection4Iterator(Collection4 collection, List4 first) {
32: super (first);
33: _collection = collection;
34: _initialVersion = currentVersion();
35: }
36:
37: public boolean moveNext() {
38: validate();
39: return super .moveNext();
40: }
41:
42: public Object current() {
43: validate();
44: return super .current();
45: }
46:
47: private void validate() {
48: if (_initialVersion != currentVersion()) {
49: throw new InvalidIteratorException();
50: }
51: }
52:
53: private int currentVersion() {
54: return _collection.version();
55: }
56: }
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