Downloadable.php

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<?php
namespace Magento\Wishlist\Pricing\ConfiguredPrice;

use Magento\Catalog\Model\Product\Configuration\Item\ItemInterface;
use Magento\Catalog\Pricing\Price\ConfiguredPriceInterface;
use Magento\Catalog\Pricing\Price\FinalPrice;

class Downloadable extends FinalPrice implements ConfiguredPriceInterface
{
    const PRICE_CODE = 'configured_price';

    private $item;

    public function getValue()
    {
        return max(0, parent::getValue() + $this->getLinkPrice());
    }

    private function getLinkPrice()
    {
        $result = 0;
        if ($this->getProduct()->getLinksPurchasedSeparately()) {
            $customOption = $this->getProduct()->getCustomOption('downloadable_link_ids');
            if ($customOption) {
                $links = $this->getLinks();
                $linkIds = explode(',', $customOption->getValue());
                foreach ($linkIds as $linkId) {
                    if (isset($links[$linkId])) {
                        $result += $links[$linkId]->getPrice();
                    }
                }
            }
        }
        return $result;
    }

    private function getLinks()
    {
        $productType = $this->getProduct()->getTypeInstance();
        $links = $productType->getLinks($this->getProduct());
        return $links;
    }

    public function setItem(ItemInterface $item)
    {
        $this->item = $item;
        return $this;
    }
}