Select.php

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<?php
namespace Magento\Eav\Model\Attribute\Data;

use Magento\Framework\App\RequestInterface;

class Select extends \Magento\Eav\Model\Attribute\Data\AbstractData
{
    public function extractValue(RequestInterface $request)
    {
        return $this->_getRequestValue($request);
    }

    public function validateValue($value)
    {
        $errors = [];
        $attribute = $this->getAttribute();

        if ($value === false) {
            // try to load original value and validate it
            $value = $this->getEntity()->getData($attribute->getAttributeCode());
        }

        if ($attribute->getIsRequired() && empty($value) && $value != '0') {
            $label = __($attribute->getStoreLabel());
            $errors[] = __('"%1" is a required value.', $label);
        }

        if (!$errors && !$attribute->getIsRequired() && empty($value)) {
            return true;
        }

        if (count($errors) == 0) {
            return true;
        }

        return $errors;
    }

    public function compactValue($value)
    {
        if ($value !== false) {
            $this->getEntity()->setData($this->getAttribute()->getAttributeCode(), $value);
        }
        return $this;
    }

    public function restoreValue($value)
    {
        return $this->compactValue($value);
    }

    protected function _getOptionText($value)
    {
        return $this->getAttribute()->getSource()->getOptionText($value);
    }

    public function outputValue($format = \Magento\Eav\Model\AttributeDataFactory::OUTPUT_FORMAT_TEXT)
    {
        $value = $this->getEntity()->getData($this->getAttribute()->getAttributeCode());
        switch ($format) {
            case \Magento\Eav\Model\AttributeDataFactory::OUTPUT_FORMAT_JSON:
                $output = $value;
                break;
            default:
                if ($value != '') {
                    $output = $this->_getOptionText($value);
                } else {
                    $output = '';
                }
                break;
        }

        return $output;
    }
}