Factory.php

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<?php
namespace Magento\ImportExport\Model\Export;

class Factory
{
    protected $_objectManager;

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

    public function create($className)
    {
        if (!$className) {
            throw new \InvalidArgumentException('Incorrect class name');
        }

        $attributeCollection = $this->_objectManager->create($className);

        if (!$attributeCollection instanceof \Magento\Framework\Data\Collection) {
            throw new \InvalidArgumentException(
                sprintf(
                    "Attribute factory class \"%s\" must implement \Magento\Framework\Data\Collection.",
                    get_class($attributeCollection)
                )
            );
        }
        return $attributeCollection;
    }
}