/**
  * @param ProductValueInterface $productValue
  * @param ProductValueInterface $value
  */
 protected function setProductMetric(ProductValueInterface $productValue, ProductValueInterface $value)
 {
     if (null === ($metric = $productValue->getMetric())) {
         $metric = $this->metricFactory->createMetric($value->getAttribute()->getMetricFamily());
         $productValue->setMetric($metric);
     }
     $metric->setUnit($value->getMetric()->getUnit());
     $metric->setData($value->getMetric()->getData());
 }