SerializationTestNormalizer.php

<?php

namespace Drupal\serialization_test;

use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
class SerializationTestNormalizer implements NormalizerInterface {
    
    /**
     * The format that this Normalizer supports.
     *
     * @var string
     */
    protected static $format = 'serialization_test';
    
    /**
     * Normalizes an object into a set of arrays/scalars.
     *
     * @param object $object
     *   Object to normalize.
     * @param string|null $format
     *   (optional) Format the normalization result will be encoded as. Defaults
     *   to NULL
     * @param array $context
     *   (optional) The context data. Defaults to an empty array.
     *
     * @return array
     *   An array containing a normalized representation of $object, appropriate
     *   for encoding to the requested format.
     */
    public function normalize($object, $format = NULL, array $context = []) {
        $normalized = (array) $object;
        // Add identifying value that can be used to verify that the expected
        // normalizer was invoked.
        $normalized['normalized_by'] = 'SerializationTestNormalizer';
        return $normalized;
    }
    
    /**
     * Checks whether format is supported by this normalizer.
     *
     * @param mixed $data
     *   Data to normalize.
     * @param string $format
     *   Format the normalization result will be encoded as.
     *
     * @return bool
     *   Returns TRUE if the normalizer can handle the request.
     */
    public function supportsNormalization($data, $format = NULL) {
        return static::$format === $format;
    }

}