Country.php

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<?php
namespace Magento\Directory\Model\ResourceModel;

class Country extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected function _construct()
    {
        $this->_init('directory_country', 'country_id');
    }

    public function loadByCode(\Magento\Directory\Model\Country $country, $code)
    {
        switch (strlen($code)) {
            case 2:
                $field = 'iso2_code';
                break;

            case 3:
                $field = 'iso3_code';
                break;

            default:
                throw new \Magento\Framework\Exception\LocalizedException(
                    __('Please correct the country code: %1.', htmlspecialchars($code))
                );
        }

        return $this->load($country, $code, $field);
    }
}