subdomain component for cakephp that depends on a model

subdomain.php

<?php
class SubdomainComponent extends Object {

    var $__settings = array(
        'base' => 'example.com',
        'domains' => array(),
        'param' => 'subdomain',
        'redirect' => true,
        'redirectTo' => 'http://example.com',
        'model' => 'DomainPrefix',
        'method' => 'getSubdomain',
        'cookie' => false,
    );
    var $components = array('Cookie');
    var $Controller = null;
/**
 * Called before the Controller::beforeFilter().
 *
 * @param object  A reference to the controller
 * @return void
 * @access public
 * @link http://book.cakephp.org/view/65/MVC-Class-Access-Within-Components
 */
    function initialize(&$controller, $settings = array()) {
        $this->__settings = array_merge($this->__settings, $settings);
		$this->Controller = $controller;
 
        if (!in_array(strtolower($_SERVER['HTTP_HOST']), $this->__settings['domains'])) {  
			$urlParts = explode('.', strtolower($_SERVER['HTTP_HOST']));
            $subdomain = ($urlParts[0] == 'www') ? $urlParts[1] : $urlParts[0];

            if (($record = Cache::read("subdomain.{$subdomain}")) === false) {
                $this->Controller->loadModel($this->__settings['model']);
                $record = $this->Controller->{$this->__settings['model']}->{$this->__settings['method']}($subdomain);
                if ($record) {
                    Cache::write("subdomain.{$subdomain}", $record);
                }
            }

            if ($record) {
                // Cool cause now we can check the subdomain in every action
                $this->Controller->params[$this->__settings['param']] = $record;

                if ($this->__settings['cookie']) {
                    $this->Cookie->domain = '.' . $this->__settings['base'];
                    $this->Cookie->key = Configure::read('Security.salt');

                    if (!class_exists('Set')) {
                        App::import('Core', 'Set');
                    }

                    $this->Cookie->write('subdomain', Set::classicExtract($record, $this->__settings['cookie']));
                }
                return;
            }
            
            // Optionally, you could redirect to an error page or something
            $this->Controller->params[$this->__settings['param']] = null;
            if ($this->__settings['redirect'] && $this->__settings['redirectTo']){
                $this->Controller->redirect($this->__settings['redirectTo'], 404);
            }
        }
    }

    function redirectOnCookie() {
        if (!empty($this->Controller->params[$this->__settings['param']])) {
            return;
        }
 
        $this->Cookie->domain = '.' . $this->__settings['base'];
        $this->Cookie->key = Configure::read('Security.salt');
        $subdomain = $this->Cookie->read('subdomain');
        if ($subdomain) {
            $this->Controller->redirect('http://' . $subdomain . '.' . $this->__settings['base']);
        }
    }
}