CommentFactory.php

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

class CommentFactory
{
    protected $_objectManager;

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

    public function create($type)
    {
        $commentModel = $this->_objectManager->create($type);
        if (!$commentModel instanceof CommentInterface) {
            throw new \InvalidArgumentException('Incorrect comment model provided');
        }
        return $commentModel;
    }
}