HandlerFactory.php

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<?php
namespace Magento\Catalog\Controller\Adminhtml\Product\Initialization\Helper;

class HandlerFactory
{
    protected $objectManager;

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

    public function create($instance, array $arguments = [])
    {
        if (!is_subclass_of(
            $instance,
            \Magento\Catalog\Controller\Adminhtml\Product\Initialization\Helper\HandlerInterface::class
        )
        ) {
            throw new \InvalidArgumentException(
                $instance .
                ' does not implement ' .
                \Magento\Catalog\Controller\Adminhtml\Product\Initialization\Helper\HandlerInterface::class
            );
        }

        return $this->objectManager->create($instance, $arguments);
    }
}