StringNormalizer.php

<?php

namespace Drupal\jsonapi_test_data_type\Normalizer;

use Drupal\Core\TypedData\Plugin\DataType\StringData;
use Drupal\serialization\Normalizer\NormalizerBase;
use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;

/**
 * Normalizes string data weirdly: replaces 'super' with 'NOT' and vice versa.
 */
class StringNormalizer extends NormalizerBase implements DenormalizerInterface {
    
    /**
     * {@inheritdoc}
     */
    protected $supportedInterfaceOrClass = StringData::class;
    
    /**
     * {@inheritdoc}
     */
    public function normalize($object, $format = NULL, array $context = []) {
        return str_replace('super', 'NOT', $object->getValue());
    }
    
    /**
     * {@inheritdoc}
     */
    public function denormalize($data, $class, $format = NULL, array $context = []) {
        return str_replace('NOT', 'super', $data);
    }

}