Postcode.php

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<?php
namespace Magento\Customer\Model\Metadata\Form;

use Magento\Customer\Api\Data\AttributeMetadataInterface;
use Magento\Customer\Model\Metadata\ElementFactory;
use Magento\Directory\Helper\Data as DirectoryHelper;
use Magento\Framework\Locale\ResolverInterface;
use Psr\Log\LoggerInterface as PsrLogger;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface as MagentoTimezone;

class Postcode extends AbstractData
{
    protected $directoryHelper;

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

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

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

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

    public function extractValue(\Magento\Framework\App\RequestInterface $request)
    {
        return $this->_applyInputFilter($this->_getRequestValue($request));
    }

    public function compactValue($value)
    {
        return $value;
    }

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

    public function outputValue($format = ElementFactory::OUTPUT_FORMAT_TEXT)
    {
        return $this->_applyOutputFilter($this->_value);
    }
}