/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.collections.Stack");
dojo.require("dojo.collections.Collections");

dojo.collections.Stack=function(/* array? */arr){
	//	summary
	//	returns an object of type dojo.collections.Stack
	var q=[];
	if (arr) q=q.concat(arr);
	this.count=q.length;
	this.clear=function(){
		//	summary
		//	Clear the internal array and reset the count
		q=[];
		this.count=q.length;
	};
	this.clone=function(){
		//	summary
		//	Create and return a clone of this Stack
		return new dojo.collections.Stack(q);
	};
	this.contains=function(/* object */o){
		//	summary
		//	check to see if the stack contains object o
		for (var i=0; i<q.length; i++){
			if (q[i] == o){
				return true;	//	bool
			}
		}
		return false;	//	bool
	};
	this.copyTo=function(/* array */ arr, /* int */ i){
		//	summary
		//	copy the stack into array arr at index i
		arr.splice(i,0,q);
	};
	this.forEach=function(/* function */ fn, /* object? */ scope){
		//	summary
		//	functional iterator, following the mozilla spec.
		var s=scope||dj_global;
		if(Array.forEach){
			Array.forEach(q, fn, s);
		}else{
			for(var i=0; i<q.length; i++){
				fn.call(s, q[i], i, q);
			}
		}
	};
	this.getIterator=function(){
		//	summary
		//	get an iterator for this collection
		return new dojo.collections.Iterator(q);	//	dojo.collections.Iterator
	};
	this.peek=function(){
		//	summary
		//	Return the next item without altering the stack itself.
		return q[(q.length-1)];	//	object
	};
	this.pop=function(){
		//	summary
		//	pop and return the next item on the stack
		var r=q.pop();
		this.count=q.length;
		return r;	//	object
	};
	this.push=function(/* object */ o){
		//	summary
		//	Push object o onto the stack
		this.count=q.push(o);
	};
	this.toArray=function(){
		//	summary
		//	create and return an array based on the internal collection
		return [].concat(q);	//	array
	};
}