ResultFactory.php

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<?php
namespace Magento\Framework\View\TemplateEngine\Xhtml;

use Magento\Framework\Phrase;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\ObjectManagerInterface;

class ResultFactory
{
    protected $objectManager;

    protected $instanceName;

    public function __construct(
        ObjectManagerInterface $objectManager,
        $instanceName = \Magento\Framework\View\TemplateEngine\Xhtml\ResultInterface::class
    ) {
        $this->objectManager = $objectManager;
        $this->instanceName = $instanceName;
    }

    public function create(array $arguments = [])
    {
        $object = $this->objectManager->create($this->instanceName, $arguments);

        if (!($object instanceof ResultInterface)) {
            throw new LocalizedException(new Phrase('This class must implement the "ResultInterface"'));
        }

        return $object;
    }
}