ValidatorResultMerger.php

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<?php
namespace Magento\Sales\Model;

class ValidatorResultMerger
{
    private $validatorResultInterfaceFactory;

    public function __construct(ValidatorResultInterfaceFactory $validatorResultInterfaceFactory)
    {
        $this->validatorResultInterfaceFactory = $validatorResultInterfaceFactory;
    }

    public function merge(ValidatorResultInterface $first, ValidatorResultInterface $second, ... $validatorMessages)
    {
        $messages = array_merge($first->getMessages(), $second->getMessages(), ...$validatorMessages);

        $result = $this->validatorResultInterfaceFactory->create();
        foreach ($messages as $message) {
            $result->addMessage($message);
        }

        return $result;
    }
}