package org.orbeon.jaxen.util;
/*
* $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/util/DescendantAxisIterator.java,v 1.12 2006/02/05 21:47:40 elharo Exp $
* $Revision: 1.12 $
* $Date: 2006/02/05 21:47:40 $
*
* ====================================================================
*
* Copyright 2000-2005 bob mcwhirter & James Strachan.
* All rights reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of the Jaxen Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
* This software consists of voluntary contributions made by many
* individuals on behalf of the Jaxen Project and was originally
* created by bob mcwhirter <bob@werken.com> and
* James Strachan <jstrachan@apache.org>. For more information on the
* Jaxen Project, please see <http://www.jaxen.org/>.
*
* $Id: DescendantAxisIterator.java,v 1.12 2006/02/05 21:47:40 elharo Exp $
*/
import org.orbeon.jaxen.JaxenRuntimeException;
import org.orbeon.jaxen.Navigator;
import org.orbeon.jaxen.UnsupportedAxisException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.NoSuchElementException;
public class DescendantAxisIterator implements Iterator
{
private ArrayList stack = new ArrayList();
private Iterator children;
private Navigator navigator;
public DescendantAxisIterator(Object contextNode,
Navigator navigator) throws UnsupportedAxisException
{
this(navigator, navigator.getChildAxisIterator(contextNode));
}
public DescendantAxisIterator(Navigator navigator,
Iterator iterator)
{
this.navigator = navigator;
this.children = iterator;
}
public boolean hasNext()
{
while (!children.hasNext())
{
if (stack.isEmpty())
{
return false;
}
children = (Iterator) stack.remove(stack.size()-1);
}
return true;
}
public Object next()
{
try
{
if (hasNext())
{
Object node = children.next();
stack.add(children);
children = navigator.getChildAxisIterator(node);
return node;
}
throw new NoSuchElementException();
}
catch (UnsupportedAxisException e)
{
throw new JaxenRuntimeException(e);
}
}
public void remove()
{
throw new UnsupportedOperationException();
}
}