Data.php

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<?php
namespace Magento\DownloadableImportExport\Helper;

use Magento\DownloadableImportExport\Model\Import\Product\Type\Downloadable;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    public function isRowDownloadableEmptyOptions(array $rowData)
    {
        $result = isset($rowData[Downloadable::COL_DOWNLOADABLE_LINKS])
            && $rowData[Downloadable::COL_DOWNLOADABLE_LINKS] == ''
            && isset($rowData[Downloadable::COL_DOWNLOADABLE_SAMPLES])
            && $rowData[Downloadable::COL_DOWNLOADABLE_SAMPLES] == '';
        return $result;
    }

    public function isRowDownloadableNoValid(array $rowData)
    {
        $result = isset($rowData[Downloadable::COL_DOWNLOADABLE_SAMPLES]) ||
            isset($rowData[Downloadable::COL_DOWNLOADABLE_LINKS]);
        return $result;
    }

    public function fillExistOptions(array $base, array $option, array $existingOptions)
    {
        $result = [];
        foreach ($existingOptions as $existingOption) {
            if ($option['link_url'] == $existingOption['link_url']
                && $option['link_file'] == $existingOption['link_file']
                && $option['link_type'] == $existingOption['link_type']
                && $option['sample_url'] == $existingOption['sample_url']
                && $option['sample_file'] == $existingOption['sample_file']
                && $option['sample_type'] == $existingOption['sample_type']
                && $option['product_id'] == $existingOption['product_id']) {
                $result = array_replace($base, $option, $existingOption);
            }
        }
        return $result;
    }

    public function prepareDataForSave(array $base, array $replacement)
    {
        $result = [];
        foreach ($replacement as $item) {
            $result[] = array_intersect_key($item, $base);
        }
        return $result;
    }

    public function getTypeByValue($option)
    {
        $result = Downloadable::FILE_OPTION_VALUE;
        if (preg_match('/\bhttps?:\/\//i', $option)) {
            $result = Downloadable::URL_OPTION_VALUE;
        }
        return $result;
    }
}