SourceItemValidatorChain.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryApi\Model;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Validation\ValidationResult;
use Magento\Framework\Validation\ValidationResultFactory;
use Magento\InventoryApi\Api\Data\SourceItemInterface;

class SourceItemValidatorChain implements SourceItemValidatorInterface
{
    private $validationResultFactory;

    private $validators;

    public function __construct(
        ValidationResultFactory $validationResultFactory,
        array $validators = []
    ) {
        $this->validationResultFactory = $validationResultFactory;

        foreach ($validators as $validator) {
            if (!$validator instanceof SourceItemValidatorInterface) {
                throw new LocalizedException(
                    __('Source item Validator must implement SourceItemValidatorInterface.')
                );
            }
        }
        $this->validators = $validators;
    }

    public function validate(SourceItemInterface $sourceItem): ValidationResult
    {
        $errors = [];
        foreach ($this->validators as $validator) {
            $validationResult = $validator->validate($sourceItem);

            if (!$validationResult->isValid()) {
                $errors = array_merge($errors, $validationResult->getErrors());
            }
        }
        return $this->validationResultFactory->create(['errors' => $errors]);
    }
}