Haanga::checkCacheDir PHP Method

    public static function checkCacheDir()
    {
        $dir = self::$cache_dir;
        if (!is_dir($dir)) {
            $old = umask(0);
            if (!mkdir($dir, 0777, TRUE)) {
                throw new Haanga_Exception("{$dir} is not a valid directory");
            }
            umask($old);
        }
        if (!is_writable($dir)) {
            throw new Haanga_Exception("{$dir} can't be written");
        }
    }