Google\Spreadsheet\SpreadsheetService::getSpreadsheetFeed PHP Method

    public function getSpreadsheetFeed()
    {
        return new SpreadsheetFeed(new \SimpleXMLElement(ServiceRequestFactory::getInstance()->get("feeds/spreadsheets/private/full")));
    }

 /**
  *
  * @param string $format
  */
 public function write(Table $table, OutputInterface $output)
 {
     $serviceRequest = new DefaultServiceRequest();
     ServiceRequestFactory::setInstance($serviceRequest);
     $spreadsheetService = new SpreadsheetService();
     $spreadsheetFeed = $spreadsheetService->getSpreadsheetFeed();
 }