<?php
Class RootGenerator {
	private static $instance = null;
	private static $generator = null;

	private function __construct() {
		# code...
	}

	protected function __clone ()
	{
		# code...
	}

	public static function getInstance ()
	{
		if(is_null($instance))
		{
			self::$instance = new PHPExcel();
			self::$instance->getProperties()->setCreator("Sdm-club administrator")
								->setLastModifiedBy("Sdm-club administrator")
								->setTitle("Office 2007 XLSX Document")
								->setSubject("Office 2007 XLSX Document")
								->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
								->setKeywords("office 2007 openxml php")
								->setCategory("Report file");
		}
		return self::$instance;
	}
}