<?php
class Registry extends ArrayObject{
	private static $_instance;
	private static $_registry = null;
	private static $_registryClassName = 'Registry';
	
	public function __construct( )
	{
	}
    
    public static function getInstance()
    {
        if (self::$_registry === null) {
            self::setInstance(new self::$_registryClassName());
        }

        return self::$_registry;
    }
    
    public static function setInstance(Registry $registry)
    {
        self::$_registry = $registry;
    }
    
	public static function get($index)
	{
		$instance = self::getInstance();
		return $instance->offsetGet($index);
	}
	
	public static function set($index, $value)
	{
		$instance = self::getInstance();
		$instance->offsetSet($index, $value);
	}
}