Config.php

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<?php
namespace Magento\Framework\App;

use Magento\Framework\App\Config\ConfigTypeInterface;
use Magento\Framework\App\Config\ScopeCodeResolver;
use Magento\Framework\App\Config\ScopeConfigInterface;

class Config implements ScopeConfigInterface
{
    const CACHE_TAG = 'CONFIG';

    private $scopeCodeResolver;

    private $types;

    public function __construct(
        ScopeCodeResolver $scopeCodeResolver,
        array $types = []
    ) {
        $this->scopeCodeResolver = $scopeCodeResolver;
        $this->types = $types;
    }

    public function getValue(
        $path = null,
        $scope = ScopeConfigInterface::SCOPE_TYPE_DEFAULT,
        $scopeCode = null
    ) {
        if ($scope === 'store') {
            $scope = 'stores';
        } elseif ($scope === 'website') {
            $scope = 'websites';
        }
        $configPath = $scope;
        if ($scope !== 'default') {
            if (is_numeric($scopeCode) || $scopeCode === null) {
                $scopeCode = $this->scopeCodeResolver->resolve($scope, $scopeCode);
            } elseif ($scopeCode instanceof \Magento\Framework\App\ScopeInterface) {
                $scopeCode = $scopeCode->getCode();
            }
            if ($scopeCode) {
                $configPath .= '/' . $scopeCode;
            }
        }
        if ($path) {
            $configPath .= '/' . $path;
        }
        return $this->get('system', $configPath);
    }

    public function isSetFlag($path, $scope = ScopeConfigInterface::SCOPE_TYPE_DEFAULT, $scopeCode = null)
    {
        return !!$this->getValue($path, $scope, $scopeCode);
    }

    public function clean()
    {
        foreach ($this->types as $type) {
            $type->clean();
        }
        $this->scopeCodeResolver->clean();
    }

    public function get($configType, $path = '', $default = null)
    {
        $result = null;
        if (isset($this->types[$configType])) {
            $result = $this->types[$configType]->get($path);
        }

        return $result !== null ? $result : $default;
    }
}