Config.php

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

class Config
{
    private $_servicesConfig;

    public function __construct(array $servicesConfig)
    {
        foreach ($servicesConfig as $serviceName => $serviceInfo) {
            if (!is_string($serviceName) || empty($serviceName)) {
                throw new \InvalidArgumentException('Name for a currency import service has to be specified.');
            }
            if (empty($serviceInfo['class'])) {
                throw new \InvalidArgumentException('Class for a currency import service has to be specified.');
            }
            if (empty($serviceInfo['label'])) {
                throw new \InvalidArgumentException('Label for a currency import service has to be specified.');
            }
        }
        $this->_servicesConfig = $servicesConfig;
    }

    public function getAvailableServices()
    {
        return array_keys($this->_servicesConfig);
    }

    public function getServiceClass($serviceName)
    {
        if (isset($this->_servicesConfig[$serviceName]['class'])) {
            return $this->_servicesConfig[$serviceName]['class'];
        }
        return null;
    }

    public function getServiceLabel($serviceName)
    {
        if (isset($this->_servicesConfig[$serviceName]['label'])) {
            return __($this->_servicesConfig[$serviceName]['label']);
        }
        return null;
    }
}