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<?php
namespace VendorName\ExtraCountries\Plugin\Framework\Locale;
​
use Magento\Framework\Locale\ListsInterface;
​
/**
 * Plugin to add full names of added countries that are not included in Zend Locale Data
 */
class TranslatedListsPlugin
{
    /**
     * Get the full name of added countries
     *
     * Since the locale data for the added country may not be present in the Zend Locale Library,
     * we need to provide full country name matching the added code
     *
     * @param ListsInterface $subject
     * @param callable $proceed
     * @param $value
     * @param null $locale
     * @return string
     */
    public function aroundGetCountryTranslation(
        ListsInterface $subject,
        callable $proceed,
        $value,
        $locale = null
    )
    {
        if ($value == 'XX') {
            return 'Abstract Country';
        }
​
        return $proceed($value, $locale);
    }
}

<?php
namespace Magento\ExtraCountries\Setup\Patch\Data;
​
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\Patch\DataPatchInterface;
use Magento\Framework\Setup\Patch\PatchVersionInterface;
​
/**
 * Add Abstract Country data to the country list
 *
 * @package Magento\ExtraCountries\Setup\Patch
 */
class AddDataForAbstractCountry implements DataPatchInterface, PatchVersionInterface
{
    /**
     * @var ModuleDataSetupInterface
     */
    private $moduleDataSetup;
​
    /**
     * @param ModuleDataSetupInterface $moduleDataSetup
     */
    public function __construct(
        ModuleDataSetupInterface $moduleDataSetup
    ) {
        $this->moduleDataSetup = $moduleDataSetup;
    }
​
    /**
     * @inheritdoc
     */
    public function apply()
    {
        /**
         * Fill table directory/country
         */
        $data = [
            ['XX', 'XX', 'XX']
        ];
​
        $columns = ['country_id', 'iso2_code', 'iso3_code'];
        $this->moduleDataSetup->getConnection()->insertArray(
            $this->moduleDataSetup->getTable('directory_country'),
            $columns,
            $data
        );
    }
​
    /**
     * @inheritdoc
     */
    public static function getDependencies()
    {
        return [];
    }
​
    /**
     * @inheritdoc
     */
    public static function getVersion()
    {
        return '0.0.1';
    }
​
    /**
     * @inheritdoc
     */
    public function getAliases()
    {
        return [];
    }
}