public function handlePublishPageNumber(PublishEvent $event)
    {
        $document = $event->getDocument();
        $node = $event->getNode();
        $propertyName = $this->propertyEncoder->systemName(static::FIELD);
        if (!$document instanceof PageBehavior) {
            return;
        }

        $node->setProperty($propertyName, $document->getPageNumber());
    }