/**
     * @param  string  $mokuteki
     * @return CartItem
     */
    public function setMokuteki($mokuteki)
    {
        $this->mokuteki = $mokuteki;

        return $this;
    }

    /**
     * @return string
     */
    public function getMokuteki()
    {
        return $this-> mokuteki;
    }

 
    /**
     *
     * @param  string $productClassId
     * @param  string $mokuteki
     * @return \Eccube\Service\CartService
     */
    public function addProduct($productClassId, $mokuteki)
    {
        $mokuteki += $this->getProductMokuteki($productClassId);
        $this->setProductMokuteki($productClassId, $mokuteki);

        return $this;
    }
    /**
     * @param  string $productClassId
     * @return integer
     */
    public function getProductMokuteki($productClassId)
    {
        $CartItem = $this->cart->getCartItemByIdentifier('Eccube\Entity\ProductClass', (string) $productClassId);
        if ($CartItem) {
            return $CartItem->getMokuteki();
        } else {
            return 0;
        }
    }
    /**
     * @param  \Eccube\Entity\ProductClass|integer $ProductClass
     * @param  string $mokuteki
     * @return \Eccube\Service\CartService
     * @throws CartException
     */
    public function setProductMokuteki($ProductClass, $mokuteki)
    {
        if (!$ProductClass instanceof ProductClass) {
            $ProductClass = $this->entityManager
                ->getRepository('Eccube\Entity\ProductClass')
                ->find($ProductClass);
            if (!$ProductClass) {
                throw new CartException('cart.product.delete');
            }
        }
        if ($ProductClass->getProduct()->getStatus()->getId() !== Disp::DISPLAY_SHOW) {
            $this->removeProduct($ProductClass->getId());
            throw new CartException('cart.product.not.status');
        }

        $productName = $ProductClass->getProduct()->getName();
        if ($ProductClass->hasClassCategory1()) {
            $productName .= " - ".$ProductClass->getClassCategory1()->getName();
        }
        if ($ProductClass->hasClassCategory2()) {
            $productName .= " - ".$ProductClass->getClassCategory2()->getName();
        }

        $CartItem = new CartItem();
        $CartItem
            ->setClassName('Eccube\Entity\ProductClass')
            ->setClassId((string) $ProductClass->getId())
            ->setMokuteki($mokuteki);

        $this->cart->setCartItem($CartItem);

        return $this;
    }

$app['eccube.service.cart']->addProduct($addCartData['product_class_id'], $addCartData['quantity'], $addCartData['mokuteki'])->save();