XmlToArrayConfigConverter.php

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<?php
namespace Magento\Signifyd\Model\PaymentMethodMapper;

use Magento\Framework\Config\Dom\ValidationSchemaException;

class XmlToArrayConfigConverter implements \Magento\Framework\Config\ConverterInterface
{
    private static $paymentMethodNodeType = 'payment_method';

    private static $magentoCodeNodeType = 'magento_code';

    private static $signifydCodeNodeType = 'signifyd_code';

    public function convert($source)
    {
        $paymentMethods = $source->getElementsByTagName(self::$paymentMethodNodeType);
        $paymentsList = [];
        foreach ($paymentMethods as $paymentMethod) {
            $paymentsList += $this->getPaymentMethodMapping($paymentMethod);
        }

        return $paymentsList;
    }

    private function getPaymentMethodMapping(\DOMElement $payment)
    {
        $paymentMethodCode = $this->readSubnodeValue($payment, self::$magentoCodeNodeType);
        $signifyPaymentMethodCode = $this->readSubnodeValue($payment, self::$signifydCodeNodeType);

        return [$paymentMethodCode => $signifyPaymentMethodCode];
    }

    private function readSubnodeValue(\DOMElement $element, $subNodeType)
    {
        $domList = $element->getElementsByTagName($subNodeType);
        if (empty($domList[0])) {
            throw new ValidationSchemaException(__('Only single entrance of "%1" node is required.', $subNodeType));
        }

        $subNodeValue = trim($domList[0]->nodeValue);
        if (!$subNodeValue) {
            throw new ValidationSchemaException(__('Not empty value for "%1" node is required.', $subNodeType));
        }

        return $subNodeValue;
    }
}