Runtime.php

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<?php
namespace Magento\Framework\ObjectManager\Relations;

class Runtime implements \Magento\Framework\ObjectManager\RelationsInterface
{
    protected $_classReader;

    protected $_default = [];

    public function __construct(\Magento\Framework\Code\Reader\ClassReaderInterface $classReader = null)
    {
        $this->_classReader = $classReader ?: new \Magento\Framework\Code\Reader\ClassReader();
    }

    public function has($type)
    {
        return class_exists($type) || interface_exists($type);
    }

    public function getParents($type)
    {
        if (!class_exists($type)) {
            return $this->_default;
        }
        return $this->_classReader->getParents($type) ?: $this->_default;
    }
}