/*********************************************************************************
Copyright (C) 2007  Ryan Bowman

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

For any questions or comments contact ryan at fiddlerelf dot com
**********************************************************************************/
function WXHistory()
{
	this.nodes = new Array();
	this.index = 0;
	
	this.clear = FHclear;
	this.next = FHnext;
	this.previous = FHprevious;
	this.push = FHpush;
	this.current = FHcurrent;
	this.length = FHlength;
	this.hasNext = FHhasNext;
	this.hasPrevious = FHhasPrevious;
}


function FHhasPrevious()
{
	return this.index > 0;
}
function FHhasNext()
{
	return this.index < (this.nodes.length - 1);
}
function FHpush(nodeId)
{
	while (this.nodes.length > this.index + 1)
	{
		this.nodes.pop();
	}
	this.index = this.nodes.push(nodeId) - 1;
}
function FHnext()
{
	if (this.hasNext())
	{
		return this.nodes[++this.index];
	}
	else
		return null;
}
function FHprevious()
{
	if (this.hasPrevious())
	{
		return this.nodes[--this.index];
	}
	else
		return null;
}
function FHclear()
{
	while(this.nodes.length > 0)
		this.nodes.pop();
}
function FHcurrent()
{
	return this.nodes[index];
}
function FHlength()
{
	return this.nodes.length;
}