ServiceDataAttributesScanner.php

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

class ServiceDataAttributesScanner implements ScannerInterface
{
    public function collectEntities(array $files)
    {
        $extensionClasses = [];
        foreach ($files as $fileName) {
            $dom = new \DOMDocument();
            $dom->loadXML(file_get_contents($fileName));
            $xpath = new \DOMXPath($dom);
            foreach ($xpath->query('//extension_attributes') as $node) {
                $forType = $node->attributes->getNamedItem('for')->nodeValue;
                $extensionClasses[] = str_replace('Interface', 'ExtensionInterface', $forType);
                $extensionClasses[] = str_replace('Interface', 'Extension', $forType);
            }
        }
        return $extensionClasses;
    }
}