FileResolver.php

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<?php
namespace Magento\Framework\App\Config;

use Magento\Framework\App\Filesystem\DirectoryList;

class FileResolver implements \Magento\Framework\Config\FileResolverInterface
{
    protected $_moduleReader;

    protected $iteratorFactory;

    protected $filesystem;

    public function __construct(
        \Magento\Framework\Module\Dir\Reader $moduleReader,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\Config\FileIteratorFactory $iteratorFactory
    ) {
        $this->iteratorFactory = $iteratorFactory;
        $this->filesystem = $filesystem;
        $this->_moduleReader = $moduleReader;
    }

    public function get($filename, $scope)
    {
        switch ($scope) {
            case 'primary':
                $directory = $this->filesystem->getDirectoryRead(DirectoryList::CONFIG);
                $absolutePaths = [];
                foreach ($directory->search('{' . $filename . ',*/' . $filename . '}') as $path) {
                    $absolutePaths[] = $directory->getAbsolutePath($path);
                }
                $iterator = $this->iteratorFactory->create($absolutePaths);
                break;
            case 'global':
                $iterator = $this->_moduleReader->getConfigurationFiles($filename);
                break;
            default:
                $iterator = $this->_moduleReader->getConfigurationFiles($scope . '/' . $filename);
                break;
        }
        return $iterator;
    }
}