RegionSource.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryAdminUi\Model\OptionSource;

use Magento\Directory\Model\ResourceModel\Region\CollectionFactory;
use Magento\Framework\Data\OptionSourceInterface;

class RegionSource implements OptionSourceInterface
{
    private $regionCollectionFactory;

    private $sourceData;

    public function __construct(CollectionFactory $regionCollectionFactory)
    {
        $this->regionCollectionFactory = $regionCollectionFactory;
    }

    public function toOptionArray()
    {
        if (null === $this->sourceData) {
            $regionCollection = $this->regionCollectionFactory->create();
            $this->sourceData = $regionCollection->toOptionArray();
        }
        return $this->sourceData;
    }
}