FormFactory.php

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<?php
namespace Magento\Framework\Data;

class FormFactory
{
    protected $_objectManager;

    protected $_instanceName;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        $instanceName = \Magento\Framework\Data\Form::class
    ) {
        $this->_objectManager = $objectManager;
        $this->_instanceName = $instanceName;
    }

    public function create(array $data = [])
    {
        $form = $this->_objectManager->create($this->_instanceName, $data);
        if (!$form instanceof \Magento\Framework\Data\Form) {
            throw new \Magento\Framework\Exception\LocalizedException(
                new \Magento\Framework\Phrase(
                    '%1 doesn\'t extend \Magento\Framework\Data\Form',
                    [$this->_instanceName]
                )
            );
        }
        return $form;
    }
}