Postcode.php

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

use Magento\Directory\Helper\Data as DirectoryHelper;
use Magento\Eav\Model\AttributeDataFactory;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Locale\ResolverInterface;
use Psr\Log\LoggerInterface as PsrLogger;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface as MagentoTimezone;

class Postcode extends \Magento\Eav\Model\Attribute\Data\AbstractData
{
    protected $directoryHelper;

    public function __construct(
        MagentoTimezone $localeDate,
        PsrLogger $logger,
        ResolverInterface $localeResolver,
        DirectoryHelper $directoryHelper
    ) {
        $this->directoryHelper = $directoryHelper;
        parent::__construct($localeDate, $logger, $localeResolver);
    }

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

        $countryId = $this->getExtractedData('country_id');
        if ($this->directoryHelper->isZipCodeOptional($countryId)) {
            return true;
        }

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

    public function extractValue(RequestInterface $request)
    {
        $value = $this->_getRequestValue($request);
        return $this->_applyInputFilter($value);
    }

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

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

    public function outputValue($format = AttributeDataFactory::OUTPUT_FORMAT_TEXT)
    {
        $value = $this->getEntity()
            ->getData($this->getAttribute()->getAttributeCode());
        $value = $this->_applyOutputFilter($value);
        return $value;
    }
}