ModificationChain.php

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<?php
namespace Magento\Setup\Module\Di\Compiler\Config;

class ModificationChain implements ModificationInterface
{
    private $modificationsList;

    public function __construct(array $modificationsList = [])
    {
        array_walk(
            $modificationsList,
            function ($modification) {
                if (!$modification instanceof ModificationInterface) {
                    throw new \InvalidArgumentException('Wrong modifier provided');
                }
            }
        );
        $this->modificationsList = $modificationsList;
    }

    public function modify(array $config)
    {
        $outputConfig = $config;
        foreach ($this->modificationsList as $modification) {
            $outputConfig = $modification->modify($outputConfig);
        }
        return $outputConfig;
    }
}