Config.php

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<?php
namespace Magento\Backend\App;

use Magento\Config\App\Config\Type\System;
use Magento\Framework\App\Config\ScopeConfigInterface;

class Config implements ConfigInterface
{
    protected $appConfig;

    private $data;

    public function __construct(\Magento\Framework\App\Config $appConfig)
    {
        $this->appConfig = $appConfig;
    }

    public function getValue($path)
    {
        if (isset($this->data[$path])) {
            return $this->data[$path];
        }

        $configPath = ScopeConfigInterface::SCOPE_TYPE_DEFAULT;
        if ($path) {
            $configPath .= '/' . $path;
        }
        return $this->appConfig->get(System::CONFIG_TYPE, $configPath);
    }

    public function setValue($path, $value)
    {
        $this->data[$path] = $value;
    }

    public function isSetFlag($path)
    {
        $configPath = ScopeConfigInterface::SCOPE_TYPE_DEFAULT;
        if ($path) {
            $configPath .= '/' . $path;
        }
        return (bool) $this->appConfig->get(System::CONFIG_TYPE, $configPath);
    }
}