<?php
/**
 * Simple AJAX stub: CacheControl
 *
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage base
 */

WBClass::load('WBAjax');

/**
 * Simple AJAX stub: CacheControl
 *
 * Flush caches
 *
 * @version 0.1.1
 * @package WB
 * @subpackage base
 */
class WBAjax_CacheControl extends WBAjax
{
    /**
     * Config
     * @var WBConfig
     */
    protected $config;

    /**
     * @var WBCache_Control
     */
    private $cacheControl;

    /**
     * Second construcotr
     * 
     * Called by constructer of super class.
     * @see include/WB/WBAjax#init()
     */
    protected function init()
    {
        $this->cacheControl =   WBClass::create('WBCache_Control');
    }
    
    /**
     * Flush Cache
     * 
     * @return string zero
     */
    protected function flush()
    {
        // check permissions
        if (!$this->user->isAuthenticated()) {
            return 0;
        }
        if (!$this->user->isInGroup('admin')) {
            return 0;
        }

        $this->cacheControl->flush();
        return 0;
    }
}