/* 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 Iterator4Impl<T> implements Iterator4 {
private final List4<T> _first;
private List4<T> _next;
private Object _current;
public Iterator4Impl(List4 first){
_first = first;
_next = first;
_current = Iterators.NO_ELEMENT;
}
public boolean moveNext() {
if (_next == null) {
_current = Iterators.NO_ELEMENT;
return false;
}
_current = _next._element;
_next = _next._next;
return true;
}
public T current(){
if (Iterators.NO_ELEMENT == _current) {
throw new IllegalStateException();
}
return (T) _current;
}
public void reset() {
_next = _first;
_current = Iterators.NO_ELEMENT;
}
}