Helly's system class

<?php
/*
=================================
			H E L L Y
---------------------------------
 @author  : Fesor
 @email   : fesors@gmail.com
 @homepage: http://helly.fesor.ru
 @version : 0.8 RC1
 @date    : 07.08.2009
=================================
*/

$time = microtime(1);

define('ROOT', dirname(__FILE__).'/');
define('SYSTEM', ROOT.'system/');
define('APPS', ROOT.'apps/');
define('CACHE', ROOT.'cache/');

function __autoload($name)
{
	require SYSTEM.system::$components[strtolower($name)];
}

//Initialisation of components
new cache;
system::$components['db'] = 'db/drivers/'.system::getConfig('dbDriver').'.php';

class system
{
	
	private static $isAjax, 
				   $_app, 
				   $rebuildDataCache=false, 
				   $rebuildMessagesCache=false, 
				   $_messages,
				   $_data;
				   
	
	//Initialisation of system
	function __construct()
	{
		//is site in offline mode?
		if(!self::getConfig('offline'))
			die(self::message('Site is offline!'));
		
		//Define URI string and match route
		new router;
		//Load and dispatch application
		self::$_app = new application( router::getAppName(), router::getRoute() );
		//Return page
		view::renderLayout();
		
	}

	
	function __destruct()
	{
		//Rebuild Cache
		self::app()->clear();
		if(self::$rebuildDataCache)
			cache::set('data', self::$_data);
		if(self::$rebuildMessagesCache)
			cache::set('messages-'.self::$_data['configs']['_system']['local'], self::$_messages);
		
	}
	
	//return's singleton of application
	public function app()
	{
		return self::$_app;
	}
	
	//return's configs
	public function getConfig($name, $app="_system")
	{
		//Load configs if it isn't defined
		if(!is_null(self::$_data))
		{
			if(cache::isCached('data'))
				self::$_data = cache::get('data');
			else
			{
				self::$_data['configs']['_system'] = require ROOT.'data/configs.php';
				self::$rebuildDataCache = true;
			}
		}
		if(!isset(self::$_data['configs'][$app]))
		{
			if($app == '_system')
				self::$_data['configs']['_system'] = require ROOT.'data/configs.php';
			else
				self::$_data['configs'][$app] = require APPS.$app.'/data/configs.php';
			self::$rebuildDataCache = true;
		}
		
		return self::$_data['configs'][$app][$name];
	}

	//return's params
	public function getParams($name, $app="_system")
	{
		//Load params if it isn't defined
		if(!is_null(self::$_data))
		{
			if(cache::isCached('data'))
				self::$_data = cache::get('data');
			else
			{
				self::$_data['params']['_system'] = require ROOT.'data/params.php';
				self::$rebuildDataCache = true;
			}
		}
		if(!isset(self::$_data['params'][$app]))
		{
			if($app == '_system')
				self::$_data['params']['_system'] = require ROOT.'data/params.php';
			else
				self::$_data['params'][$app] = require APPS.$app.'/data/params.php';
			self::$rebuildDataCache = true;
		}
		
		return self::$_data['params'][$app][$name];
	}
	
	public function message($msg, $app="_system")
	{
		if(is_null(self::$_messages) AND cache::isCached('messages-'.system::getConfig('locale')))
			self::$_messages = cache::get('messages-'.system::getConfig('locale'));
		if(!isset(self::$_messages[$app]))
		{
			if($app == '_system')
				self::$_data = require ROOT.'data/messages/'.system::getConfig('locale').'.php';
			else
				self::$_data = require APPS.$app.'/data/messages/'.system::getConfig('locale').'.php';
			self::$rebuildMessageCache = true;
		}
		return isset(self::$_messages[$app][$msg])? self::$_messages[$app][$msg] : $msg ;
	}
	
	//Check's is ajax callback or not
	public function isAjaxCallback()
	{
		if(is_null(self::$isAjax))
			self::$isAjax = ($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest')? true:false;
		return self::$isAjax;
	}
				   
	public static $components = array(
		'application' => 'base/application.php',
		'model' => 'base/model.php',
		'widget' => 'base/widget.php',
		'controller' => 'base/controller.php',
		'view' => 'base/view.php',
		'cache' => 'cache/cache.php',
		'viewcompiler' => 'base/view_compiler.php',
	);
	
	
}

new system;

echo "\n<!-- Generated in ".round(microtime(1)-$time, 4)." seconds | Memory used: ".round(memory_get_usage()/1024)." KB -->";