Source.php

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<?php
namespace Magento\Tax\Model\Rate;

use Magento\Framework\Api\SearchCriteriaBuilder;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Convert\DataObject as Converter;
use Magento\Tax\Api\TaxRateRepositoryInterface;
use Magento\Tax\Model\Rate\Provider as RateProvider;

class Source implements \Magento\Framework\Data\OptionSourceInterface
{
    protected $options;

    protected $taxRateRepository;

    protected $searchCriteriaBuilder;

    protected $converter;

    protected $rateProvider;

    public function __construct(
        TaxRateRepositoryInterface $taxRateRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder,
        Converter $converter,
        RateProvider $rateProvider = null
    ) {
        $this->taxRateRepository = $taxRateRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
        $this->converter = $converter;
        $this->rateProvider = $rateProvider ?: ObjectManager::getInstance()->get(RateProvider::class);
    }

    public function toOptionArray()
    {
        if (!$this->options) {
            $searchCriteria = $this->searchCriteriaBuilder
                ->setPageSize($this->rateProvider->getPageSize())
                ->setCurrentPage(1)
                ->create();

            $this->options = $this->rateProvider->toOptionArray($searchCriteria);
        }

        return $this->options;
    }
}