RefundOrder.php

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<?php
namespace Magento\Sales\Model\Order\Validation;

use Magento\Sales\Api\Data\CreditmemoInterface;
use Magento\Sales\Api\Data\OrderInterface;
use Magento\Sales\Model\Order\Creditmemo\CreditmemoValidatorInterface;
use Magento\Sales\Model\Order\Creditmemo\Item\Validation\CreationQuantityValidator;
use Magento\Sales\Model\Order\Creditmemo\ItemCreationValidatorInterface;
use Magento\Sales\Model\Order\Creditmemo\Validation\QuantityValidator;
use Magento\Sales\Model\Order\Creditmemo\Validation\TotalsValidator;
use Magento\Sales\Model\Order\OrderValidatorInterface;
use Magento\Sales\Model\ValidatorResultMerger;

class RefundOrder implements RefundOrderInterface
{
    private $orderValidator;

    private $creditmemoValidator;

    private $itemCreationValidator;

    private $validatorResultMerger;

    public function __construct(
        OrderValidatorInterface $orderValidator,
        CreditmemoValidatorInterface $creditmemoValidator,
        ItemCreationValidatorInterface $itemCreationValidator,
        ValidatorResultMerger $validatorResultMerger
    ) {
        $this->orderValidator = $orderValidator;
        $this->creditmemoValidator = $creditmemoValidator;
        $this->itemCreationValidator = $itemCreationValidator;
        $this->validatorResultMerger = $validatorResultMerger;
    }

    public function validate(
        OrderInterface $order,
        CreditmemoInterface $creditmemo,
        array $items = [],
        $notify = false,
        $appendComment = false,
        \Magento\Sales\Api\Data\CreditmemoCommentCreationInterface $comment = null,
        \Magento\Sales\Api\Data\CreditmemoCreationArgumentsInterface $arguments = null
    ) {
        $orderValidationResult = $this->orderValidator->validate(
            $order,
            [
                CanRefund::class
            ]
        );
        $creditmemoValidationResult = $this->creditmemoValidator->validate(
            $creditmemo,
            [
                QuantityValidator::class,
                TotalsValidator::class
            ]
        );

        $itemsValidation = [];
        foreach ($items as $item) {
            $itemsValidation[] = $this->itemCreationValidator->validate(
                $item,
                [CreationQuantityValidator::class],
                $order
            )->getMessages();
        }

        return $this->validatorResultMerger->merge(
            $orderValidationResult,
            $creditmemoValidationResult,
            ...$itemsValidation
        );
    }
}