SourceValidator.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryImportExport\Model\Import\Validator;

use Magento\Framework\Validation\ValidationResultFactory;
use Magento\InventoryApi\Api\SourceRepositoryInterface;
use Magento\InventoryImportExport\Model\Import\Sources;

class SourceValidator implements ValidatorInterface
{
    private $validationResultFactory;

    private $sourceRepository;

    private $sourceCodes = [];

    public function __construct(
        ValidationResultFactory $validationResultFactory,
        SourceRepositoryInterface $sourceRepository
    ) {
        $this->validationResultFactory = $validationResultFactory;
        $this->sourceRepository = $sourceRepository;
        $this->loadSourceCodes();
    }

    public function validate(array $rowData, int $rowNumber)
    {
        $errors = [];

        if (!isset($rowData[Sources::COL_SOURCE_CODE])) {
            $errors[] = __('Missing required column "%column"', ['column' => Sources::COL_SOURCE_CODE]);
        } elseif (!$this->isExistingSource($rowData[Sources::COL_SOURCE_CODE])) {
            $errors[] = __('Source code "%code" does not exists', ['code' => $rowData[Sources::COL_SOURCE_CODE]]);
        }

        return $this->validationResultFactory->create(['errors' => $errors]);
    }

    private function isExistingSource($sourceCode): bool
    {
        return isset($this->sourceCodes[$sourceCode]);
    }

    private function loadSourceCodes()
    {
        $sources = $this->sourceRepository->getList();
        foreach ($sources->getItems() as $source) {
            $sourceCode = $source->getSourceCode();
            $this->sourceCodes[$sourceCode] = $sourceCode;
        }
    }
}