/**
  * Bind products
  *
  * @param GroupInterface $group
  * @param array          $appendProducts
  * @param array          $removeProducts
  */
 protected function bindProducts(GroupInterface $group, array $appendProducts, array $removeProducts)
 {
     foreach ($appendProducts as $product) {
         $group->addProduct($product);
     }
     foreach ($removeProducts as $product) {
         $group->removeProduct($product);
     }
 }