<?php
/**
 * License limited to a single site, for use on another site please purchase a license for this module.
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 *
 * @author    Dingedi.com
 * @copyright Copyright 2020 © Dingedi All right reserved
 * @license   http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
 *
 * @category  Dingedi PrestaShop Modules
 */

namespace Dingedi\PsTranslationsApi;

use Dingedi\PsTranslationsApi\TranslationsProviders\AbstractTranslationProvider;

class ProviderSingleton
{
    private static $_instance;

    /** @var array<AbstractTranslationProvider> */
    private $cache = [];

    private function __construct()
    {
    }

    /**
     * @return \Dingedi\PsTranslationsApi\ProviderSingleton|null
     */
    public static function getInstance()
    {
        if (is_null(self::$_instance)) {
            self::$_instance = new ProviderSingleton();
        }

        return self::$_instance;
    }

    /**
     * @param \Dingedi\PsTranslationsApi\TranslationsProviders\AbstractTranslationProvider $provider
     * @return \Dingedi\PsTranslationsApi\TranslationsProviders\AbstractTranslationProvider
     */
    public function get($provider)
    {
        if (isset($this->cache[$provider->key])) {
            return $this->cache[$provider->key];
        }

        $this->cache[$provider->key] = $provider;

        return $provider;
    }
}
