AbstractCurrency.php

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<?php
namespace Magento\Config\Model\Config\Backend\Currency;

abstract class AbstractCurrency extends \Magento\Framework\App\Config\Value
{
    protected function _getAllowedCurrencies()
    {
        if (!$this->isFormData() || $this->getData('groups/options/fields/allow/inherit')) {
            return explode(
                ',',
                (string)$this->_config->getValue(
                    \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_ALLOW,
                    $this->getScope(),
                    $this->getScopeId()
                )
            );
        }

        return (array)$this->getData('groups/options/fields/allow/value');
    }

    protected function _getInstalledCurrencies()
    {
        return explode(
            ',',
            $this->_config->getValue(
                'system/currency/installed',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            )
        );
    }

    protected function _getCurrencyBase()
    {
        $value = $this->getData('groups/options/fields/base/value');
        if (!$this->isFormData() || !$value) {
            $value = $this->_config->getValue(
                \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_BASE,
                $this->getScope(),
                $this->getScopeId()
            );
        }
        return (string)$value;
    }

    protected function _getCurrencyDefault()
    {
        if (!$this->isFormData() || !($value = $this->getData('groups/options/fields/default/value'))) {
            $value = $this->_config->getValue(
                \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_DEFAULT,
                $this->getScope(),
                $this->getScopeId()
            );
        }
        return (string)$value;
    }

    private function isFormData()
    {
        return $this->getData('groups/options/fields') !== null;
    }
}