StringNormalizer.php

<?php

namespace Drupal\jsonapi_test_field_type\Normalizer;

use Drupal\Core\Field\Plugin\Field\FieldType\StringItem;
use Drupal\serialization\Normalizer\FieldItemNormalizer;
use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;

/**
 * Normalizes string fields weirdly: replaces 'super' with 'NOT' and vice versa.
 */
class StringNormalizer extends FieldItemNormalizer implements DenormalizerInterface {
    
    /**
     * {@inheritdoc}
     */
    public function normalize($object, $format = NULL, array $context = []) : array|string|int|float|bool|\ArrayObject|null {
        $data = parent::normalize($object, $format, $context);
        $data['value'] = str_replace('super', 'NOT', $data['value']);
        return $data;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function constructValue($data, $context) {
        $data = parent::constructValue($data, $context);
        $data['value'] = str_replace('NOT', 'super', $data['value']);
        return $data;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSupportedTypes(?string $format) : array {
        return [
            StringItem::class => TRUE,
        ];
    }

}