Carew\Event\CarewEvent::setSubject PHP Method

    public function setSubject($subject = null)
    {
        $this->subject = $subject;
    }

 public function onDocuments(CarewEvent $event)
 {
     $document = new Document();
     $document->setLayout('index.atom.twig')->setPath('feed/atom.xml')->setFilePath('feed/atom');
     $documents = $event->getSubject();
     $documents[$document->getFilePath()] = $document;
     $event->setSubject($documents);
     $globals = $event['globals'];
     $globals->documents = array_replace($globals->documents, $documents);
 }