/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see http://www.gnu.org/licenses/. */
package com.db4o.foundation;
/**
* @exclude
*/
public class Collection4Iterator extends Iterator4Impl {
private final Collection4 _collection;
private final int _initialVersion;
public Collection4Iterator(Collection4 collection, List4 first) {
super(first);
_collection = collection;
_initialVersion = currentVersion();
}
public boolean moveNext() {
validate();
return super.moveNext();
}
public Object current() {
validate();
return super.current();
}
private void validate() {
if (_initialVersion != currentVersion()) {
// FIXME: change to ConcurrentModificationException
throw new InvalidIteratorException();
}
}
private int currentVersion() {
return _collection.version();
}
}