QueryFactory.php

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<?php
namespace Magento\Framework\DB;

class QueryFactory
{
    protected $objectManager;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create($className, array $arguments = [])
    {
        $query = $this->objectManager->create($className, $arguments);
        if (!$query instanceof QueryInterface) {
            throw new \Magento\Framework\Exception\LocalizedException(
                new \Magento\Framework\Phrase(
                    '%1 doesn\'t implement \Magento\Framework\DB\QueryInterface',
                    [$className]
                )
            );
        }
        return $query;
    }
}