DefaultLocator.php

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

class DefaultLocator
{
    protected $_configuration;

    protected $_storeManager;

    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $configuration,
        \Magento\Store\Model\StoreManagerInterface $storeManager
    ) {
        $this->_configuration = $configuration;
        $this->_storeManager = $storeManager;
    }

    public function getDefaultCurrency(\Magento\Framework\App\RequestInterface $request)
    {
        if ($request->getParam('store')) {
            $store = $request->getParam('store');
            $currencyCode = $this->_storeManager->getStore($store)->getBaseCurrencyCode();
        } else {
            if ($request->getParam('website')) {
                $website = $request->getParam('website');
                $currencyCode = $this->_storeManager->getWebsite($website)->getBaseCurrencyCode();
            } else {
                if ($request->getParam('group')) {
                    $group = $request->getParam('group');
                    $currencyCode = $this->_storeManager->getGroup($group)->getWebsite()->getBaseCurrencyCode();
                } else {
                    $currencyCode = $this->_configuration->getValue(
                        \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_BASE,
                        'default'
                    );
                }
            }
        }

        return $currencyCode;
    }
}