class StringNormalizer

class StringNormalizer extends FieldItemNormalizer implements DenormalizerInterface {
  
  /**
   * Normalizes data into a set of arrays/scalars.
   *
   * @param mixed $object
   *   Data to normalize.
   * @param string|null $format
   *   Format the normalization result will be encoded as.
   * @param array<string, mixed> $context
   *   Context options for the normalizer.
   *
   * @return array
   *   Normalized data.
   */
  public function normalize($object, $format = NULL, array $context = []) : array {
    $data = parent::normalize($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,
    ];
  }

}