BackendFactory.php

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<?php
namespace Magento\Config\Model\Config;

class BackendFactory
{
    protected $_objectManager;

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

    public function create($modelName, array $arguments = [])
    {
        $model = $this->_objectManager->create($modelName, $arguments);
        if (!$model instanceof \Magento\Framework\App\Config\ValueInterface) {
            throw new \InvalidArgumentException('Invalid config field backend model: ' . $modelName);
        }
        return $model;
    }
}