CompositeScanner.php

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

class CompositeScanner implements ScannerInterface
{
    protected $_children = [];

    public function addChild(ScannerInterface $scanner, $type)
    {
        $this->_children[$type] = $scanner;
    }

    public function collectEntities(array $files)
    {
        $output = [];
        foreach ($this->_children as $type => $scanner) {
            if (!isset($files[$type]) || !is_array($files[$type])) {
                continue;
            }
            $output[$type] = array_unique($scanner->collectEntities($files[$type]));
        }
        return $output;
    }
}