/exchange/code/trunk/administrator/components/com_exchange/exchange.php

<?php
/**
 * @version		$Id: exchange.php 280 2010-09-18 02:14:15Z eddieajau $
 * @package		NewLifeInIT
 * @subpackage	com_exchange
 * @copyright	Copyright 2005 - 2010 New Life in IT Pty Ltd. All rights reserved.
 * @license		GNU General Public License version 2 or later.
 * @link		http://www.theartofjoomla.com
 */

// no direct access
defined('_JEXEC') or die;

require_once(JPATH_COMPONENT.'/version.php');
require_once(JPATH_COMPONENT.'/helper.php');

// Determine the request protocol
$protocol = JRequest::getWord('protocol');

// Get task command from the request
$cmd = JRequest::getVar('task', null);

// If it was a multiple option post get the selected option
if (is_array($cmd)) {
	$cmd = array_pop(array_keys($cmd));
}

// Filter the command and instantiate the appropriate controller
$cmd = JFilterInput::clean($cmd,'cmd');
if (strpos($cmd, '.') != false) {
	// We have a defined controller/task pair -- lets split them out
	list($controllerName, $task) = explode('.', $cmd);

	// Define the controller name and path
	$controllerName	= strtolower($controllerName);
	$controllerFile = ($protocol) ? $controllerName.'.'.$protocol : $controllerName;
	$controllerPath	= JPATH_COMPONENT.DS.'controllers'.DS.$controllerFile.'.php';

	// If the controller file path exists, include it ... else lets die with a 500 error
	if (file_exists($controllerPath)) {
		require_once($controllerPath);
	}
	else {
		JError::raiseError(500, 'Invalid Controller');
	}
}
else {
	require_once(JPATH_COMPONENT.DS.'controller.php');
	// Base controller, just set the task :)
	$controllerName = null;
	$task = $cmd;
}

// Set the name for the controller and instantiate it
$controllerClass = 'ExchangeController'.ucfirst($controllerName);

if (class_exists($controllerClass)) {
	$controller = new $controllerClass();
} else {
	JError::raiseError(500, 'Invalid Controller Class');
}

// Perform the Request task
$controller->execute($task);

// Redirect if set by the controller
$controller->redirect();

$version = new ExchangeVersion;
echo '<div id="nlitcopy">Exchange Version '.$version->version.'.'.$version->subversion.':'.$version->getBuild().' '.$version->status;
echo ' &bull; Please support us by <a href="http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,4759/Itemid,35/" target="_blank" style="font-weight:bold">rating or writing a review</a> about this extension';
echo '</div>';