RepositoryScanner.php

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<?php
namespace Magento\Setup\Module\Di\Code\Scanner;

use Magento\Framework\Autoload\AutoloaderRegistry;

class RepositoryScanner implements ScannerInterface
{
    private $useAutoload = true;

    public function collectEntities(array $files)
    {
        $repositoryClassNames = [];
        foreach ($files as $fileName) {
            $dom = new \DOMDocument();
            $dom->loadXML(file_get_contents($fileName));
            $xpath = new \DOMXPath($dom);
            foreach ($xpath->query('//preference') as $node) {
                $forType = $node->attributes->getNamedItem('for');
                $replacementType = $node->attributes->getNamedItem('type');
                if ($forType !== null
                    && $replacementType !== null
                    && (substr($forType->nodeValue, -19) == 'RepositoryInterface')
                ) {
                    if (!class_exists($replacementType->nodeValue, false)
                        && !AutoloaderRegistry::getAutoloader()->loadClass($replacementType->nodeValue)) {
                        $persistor = str_replace('\\Repository', 'InterfacePersistor', $replacementType->nodeValue);
                        $factory = str_replace('\\Repository', 'InterfaceFactory', $replacementType->nodeValue);
                        $searchResultFactory
                            = str_replace('\\Repository', 'SearchResultInterfaceFactory', $replacementType->nodeValue);
                        $repositoryClassNames[$persistor] = $persistor;
                        $repositoryClassNames[$factory] = $factory;
                        $repositoryClassNames[$searchResultFactory] = $searchResultFactory;
                        $repositoryClassNames[$replacementType->nodeValue] = $replacementType->nodeValue;
                    }
                }
            }
        }
        return $repositoryClassNames;
    }

    public function setUseAutoload($useAutoload)
    {
        $this->useAutoload = $useAutoload;
    }
}