public function getQuantity()
        {
            $quantity = 0;
            foreach ($this->getItems() as $item) {
                $quantity += $item->getQuantity();
            }

            return $quantity;
        }
		
		
		/**
		* 商品だけの税額を求める
		* @see https://umebius.com/eccube/calc-product-only-tax/
		* @return int|string
		*/
		public function getProductTax(){
			$tax = 0;
			foreach ($this->getOrderItems() as $orderItem) {
				if ($orderItem->getOrderItemType()->getId() == \Eccube\Entity\Master\OrderItemType::PRODUCT) {
					$tax += $orderItem->getTax() * $orderItem->getQuantity();
				}
			}
			return $tax;
		}
		
		
    }
}