ClassReaderDecorator.php

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

use Magento\Setup\Module\Di\Compiler\ConstructorArgument;

class ClassReaderDecorator implements \Magento\Framework\Code\Reader\ClassReaderInterface
{
    private $classReader;

    public function __construct(\Magento\Framework\Code\Reader\ClassReader $classReader)
    {
        $this->classReader = $classReader;
    }

    public function getConstructor($className)
    {
        $unmappedArguments = $this->classReader->getConstructor($className);
        if ($unmappedArguments === null) {
            return $unmappedArguments;
        }

        $arguments = [];
        foreach ($unmappedArguments as $argument) {
            $arguments[] = new ConstructorArgument($argument);
        }

        return $arguments;
    }

    public function getParents($className)
    {
        return $this->classReader->getParents($className);
    }
}