public function getAssignment($assignmentId)
    {
        if ($assignmentId == '')
            throw new Exception('Assignment ID not specified');

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

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

        $responseStream = Utils::processCommand($signedURI, 'GET', '', '');

        $json = json_decode($responseStream);

        if ($json->Code == 200)
            return $json->Assignment;
        else
            return false;
    }