Element.php

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<?php
namespace Magento\Eav\Model\Form;

use Magento\Framework\Exception\LocalizedException;

class Element extends \Magento\Framework\Model\AbstractModel
{
    protected $_eventPrefix = 'eav_form_element';

    protected $_eavConfig;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Eav\Model\Config $eavConfig,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
        $this->_eavConfig = $eavConfig;
    }

    protected function _construct()
    {
        $this->_init(\Magento\Eav\Model\ResourceModel\Form\Element::class);
    }

    public function beforeSave()
    {
        if (!$this->getTypeId()) {
            throw new LocalizedException(__('The form type is invalid. Reset the type and try again.'));
        }
        if (!$this->getAttributeId()) {
            throw new LocalizedException(__('The EAV attribute is invalid. Verify the attribute and try again.'));
        }

        return parent::beforeSave();
    }

    public function getAttribute()
    {
        if (!$this->hasData('attribute')) {
            $attribute = $this->_eavConfig->getAttribute($this->getEntityTypeId(), $this->getAttributeId());
            $this->setData('attribute', $attribute);
        }
        return $this->_getData('attribute');
    }
}