public static function checkCache()
 {
     if (sgConfiguration::get('settings.cache_autoload')) {
         $cacheFile = sgConfiguration::get('settings.cache_dir') . '/sgAutoloadCache.cache';
         if (file_exists($cacheFile)) {
             self::$isCached = true;
             self::$_cache = unserialize(file_get_contents($cacheFile));
             return true;
         }
     }
     self::$isCached = false;
     //self::loadPaths(array(dirname(__FILE__) . '/../'));
     return false;
 }