/* 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 HashtableIterator implements Iterator4 {
private final HashtableIntEntry[] _table;
private HashtableIntEntry _currentEntry;
private int _currentIndex;
public HashtableIterator(HashtableIntEntry[] table) {
_table = table;
reset();
}
private void checkInvalidTable(){
if(_table == null || _table.length == 0){
positionBeyondLast();
}
}
public Object current() {
if (_currentEntry == null) {
throw new IllegalStateException();
}
return _currentEntry;
}
public boolean moveNext() {
if(isBeyondLast()){
return false;
}
if(_currentEntry != null){
_currentEntry = _currentEntry._next;
}
while(_currentEntry == null){
if(_currentIndex >= _table.length){
positionBeyondLast();
return false;
}
_currentEntry = _table[_currentIndex++];
}
return true;
}
public void reset() {
_currentEntry = null;
_currentIndex = 0;
checkInvalidTable();
}
private boolean isBeyondLast(){
return _currentIndex == -1;
}
private void positionBeyondLast(){
_currentIndex = -1;
}
}