FixtureConfig.php

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<?php
namespace Magento\Setup\Fixtures;

use Magento\Framework\Xml\Parser;

class FixtureConfig
{
    private $config;

    private $parser;

    public function __construct(Parser $parser)
    {
        $this->parser = $parser;
    }

    public function loadConfig($filename)
    {
        if (!is_readable($filename)) {
            throw new \Exception("Profile configuration file `{$filename}` is not readable or does not exists.");
        }
        $this->parser->getDom()->load($filename);
        $this->parser->getDom()->xinclude();
        $this->config = $this->parser->xmlToArray();
        $this->config['config']['profile']['di'] = dirname($filename) . '/'
            . (isset($this->config['config']['profile']['di'])
                ? $this->config['config']['profile']['di']
                : '../../config/di.xml'
            );
    }

    public function getValue($key, $default = null)
    {
        return isset($this->config['config']['profile'][$key]) ?
            (
                // Work around for how attributes are handled in the XML parser when injected via xinclude due to the
                // files existing outside of the current working directory.
            isset($this->config['config']['profile'][$key]['_value']) ?
                $this->config['config']['profile'][$key]['_value'] : $this->config['config']['profile'][$key]
            ) : $default;
    }
}