GetList.php

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<?php
declare(strict_types=1);

namespace Magento\Inventory\Model\Source\Command;

use Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface;
use Magento\Framework\Api\SearchCriteriaBuilder;
use Magento\Framework\Api\SearchCriteriaInterface;
use Magento\Inventory\Model\ResourceModel\Source\Collection;
use Magento\Inventory\Model\ResourceModel\Source\CollectionFactory;
use Magento\InventoryApi\Api\Data\SourceSearchResultsInterface;
use Magento\InventoryApi\Api\Data\SourceSearchResultsInterfaceFactory;

class GetList implements GetListInterface
{
    private $collectionProcessor;

    private $sourceCollectionFactory;

    private $sourceSearchResultsFactory;

    private $searchCriteriaBuilder;

    public function __construct(
        CollectionProcessorInterface $collectionProcessor,
        CollectionFactory $sourceCollectionFactory,
        SourceSearchResultsInterfaceFactory $sourceSearchResultsFactory,
        SearchCriteriaBuilder $searchCriteriaBuilder
    ) {
        $this->collectionProcessor = $collectionProcessor;
        $this->sourceCollectionFactory = $sourceCollectionFactory;
        $this->sourceSearchResultsFactory = $sourceSearchResultsFactory;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
    }

    public function execute(SearchCriteriaInterface $searchCriteria = null): SourceSearchResultsInterface
    {
        $collection = $this->sourceCollectionFactory->create();

        if (null === $searchCriteria) {
            $searchCriteria = $this->searchCriteriaBuilder->create();
        } else {
            $this->collectionProcessor->process($searchCriteria, $collection);
        }

        $searchResult = $this->sourceSearchResultsFactory->create();
        $searchResult->setItems($collection->getItems());
        $searchResult->setTotalCount($collection->getSize());
        $searchResult->setSearchCriteria($searchCriteria);
        return $searchResult;
    }
}