Resolver.php

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<?php
namespace Magento\Framework\Locale;

use Magento\Framework\App\Config\ScopeConfigInterface;

class Resolver implements ResolverInterface
{
    const DEFAULT_LOCALE = 'en_US';

    protected $defaultLocale;

    protected $scopeType;

    protected $locale;

    protected $scopeConfig;

    protected $emulatedLocales = [];

    private $defaultLocalePath;

    public function __construct(
        ScopeConfigInterface $scopeConfig,
        $defaultLocalePath,
        $scopeType,
        $locale = null
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->defaultLocalePath = $defaultLocalePath;
        $this->scopeType = $scopeType;
        $this->setLocale($locale);
    }

    public function getDefaultLocalePath()
    {
        return $this->defaultLocalePath;
    }

    public function setDefaultLocale($locale)
    {
        $this->defaultLocale = $locale;
        return $this;
    }

    public function getDefaultLocale()
    {
        if (!$this->defaultLocale) {
            $locale = $this->scopeConfig->getValue($this->getDefaultLocalePath(), $this->scopeType);
            if (!$locale) {
                $locale = self::DEFAULT_LOCALE;
            }
            $this->defaultLocale = $locale;
        }
        return $this->defaultLocale;
    }

    public function setLocale($locale = null)
    {
        if ($locale !== null && is_string($locale)) {
            $this->locale = $locale;
        } else {
            $this->locale = $this->getDefaultLocale();
        }
        return $this;
    }

    public function getLocale()
    {
        if ($this->locale === null) {
            $this->setLocale();
        }
        return $this->locale;
    }

    public function emulate($scopeId)
    {
        $result = null;
        if ($scopeId) {
            $this->emulatedLocales[] = $this->getLocale();
            $this->locale = $this->scopeConfig->getValue(
                $this->getDefaultLocalePath(),
                $this->scopeType,
                $scopeId
            );
            $result = $this->locale;
        } else {
            $this->emulatedLocales[] = false;
        }
        return $result;
    }

    public function revert()
    {
        $result = null;
        $localeCode = array_pop($this->emulatedLocales);
        if ($localeCode) {
            $this->locale = $localeCode;
            $result = $this->locale;
        }
        return $result;
    }
}