package org.apache.ojb.odmg.collections;
/* Copyright 2003-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.ListIterator;
import org.apache.ojb.odmg.TransactionImpl;
import org.apache.ojb.odmg.RuntimeObject;
import org.odmg.Transaction;
/**
* Iterator implementation for {@link org.odmg.DList} implementation.
*
* @version $Id: DListIterator.java,v 1.8.2.4 2005/12/21 22:29:50 tomdz Exp $
*/
class DListIterator implements ListIterator
{
protected ListIterator iter;
private DListImpl dlist;
private DListEntry currentEntry = null;
/**
* DListIterator constructor comment.
*/
public DListIterator(DListImpl list)
{
this.dlist = list;
this.iter = list.getElements().listIterator();
}
/**
* DListIterator constructor comment.
*/
public DListIterator(DListImpl list, int index)
{
this.dlist = list;
this.iter = list.getElements().listIterator(index);
}
/**
* @see ListIterator#add(Object)
*/
public void add(Object obj)
{
DListEntry entry = new DListEntry(this.dlist, obj);
entry.setPosition(this.nextIndex() - 1);
iter.add(entry);
TransactionImpl tx = dlist.getTransaction();
if (tx != null)
{
RuntimeObject rt = new RuntimeObject(entry, tx, true);
tx.lockAndRegister(rt, Transaction.WRITE, false, tx.getRegistrationList());
}
}
/**
* @see java.util.ListIterator#hasNext()
*/
public boolean hasNext()
{
return iter.hasNext();
}
/**
* @see java.util.ListIterator#hasPrevious()
*/
public boolean hasPrevious()
{
return iter.hasPrevious();
}
/**
* @see java.util.ListIterator#next()
*/
public Object next()
{
currentEntry = ((DListEntry) iter.next());
return currentEntry.getRealSubject();
}
/**
* @see java.util.ListIterator#nextIndex()
*/
public int nextIndex()
{
return iter.nextIndex();
}
/**
* @see java.util.ListIterator#previous()
*/
public Object previous()
{
currentEntry = ((DListEntry) iter.previous());
return currentEntry.getRealSubject();
}
/**
* @see java.util.ListIterator#previousIndex()
*/
public int previousIndex()
{
return iter.previousIndex();
}
/**
* @see java.util.ListIterator#remove()
*/
public void remove()
{
iter.remove();
TransactionImpl tx = dlist.getTransaction();
if (tx != null)
{
tx.markDelete(currentEntry);
}
currentEntry = null;
}
/**
* @see ListIterator#set(Object)
*/
public void set(Object o)
{
throw new UnsupportedOperationException("Method is not supported");
// currentEntry.setRealSubject(o);
}
}