public function addCalendar($jsonData)
    {
        if ($jsonData == '')
            throw new Exception('Data not specified');

        //build URI
        $strURI = Product::$baseProductUri . '/tasks/' . $this->getFileName() . '/calendars/';

        //sign URI
        $signedURI = Utils::sign($strURI);

        $responseStream = Utils::processCommand($signedURI, 'POST', 'json', $jsonData);

        $json = json_decode($responseStream);

        if ($json->Status == 'Created')
            return $json->CalendarItem;
        else
            return false;
    }