Supplier/EventListener/SupplierDeliveryListener.php
protected function getSupplierDeliveryFromEvent(ResourceEventInterface $event)
    {
        $delivery = $event->getResource();

        if (!$delivery instanceof SupplierDeliveryInterface) {
            throw new Exception\InvalidArgumentException("Expected instance of SupplierDeliveryInterface.");
        }

        return $delivery;
    }
protected function getSupplierDeliveryFromEvent(ResourceEventInterface $event)
    {
        $delivery = $event->getResource();

        if (!$delivery instanceof SupplierDeliveryInterface) {
            throw new Exception\InvalidArgumentException("Expected instance of SupplierDeliveryInterface.");
        }

        return $delivery;
    }
Returns the supplier delivery item from the event.

@param ResourceEventInterface $event

@return SupplierDeliveryInterface
@throws Exception\InvalidArgumentException