/**
  * Converts and adds ImageAdjustments to the ImageVariant
  *
  * @param ImageInterface $asset
  * @param mixed $source
  * @param array $convertedChildProperties
  * @param PropertyMappingConfigurationInterface $configuration
  * @return ImageInterface|NULL
  */
 protected function applyTypeSpecificHandling($asset, $source, array $convertedChildProperties, PropertyMappingConfigurationInterface $configuration)
 {
     if ($asset instanceof ImageVariant) {
         $adjustments = [];
         if (isset($source['adjustments'])) {
             foreach ($source['adjustments'] as $adjustmentType => $adjustmentOptions) {
                 if (isset($adjustmentOptions['__type'])) {
                     $adjustmentType = $adjustmentOptions['__type'];
                     unset($adjustmentOptions['__type']);
                 }
                 $identity = null;
                 if (isset($adjustmentOptions['__identity'])) {
                     $identity = $adjustmentOptions['__identity'];
                     unset($adjustmentOptions['__identity']);
                 }
                 $adjustment = $this->propertyMapper->convert($adjustmentOptions, $adjustmentType, $configuration);
                 if ($identity !== null) {
                     ObjectAccess::setProperty($adjustment, 'persistence_object_identifier', $identity, true);
                 }
                 $adjustments[] = $adjustment;
             }
         } elseif (isset($source['processingInstructions'])) {
             $adjustments = $this->processingInstructionsConverter->convertFrom($source['processingInstructions'], 'array');
         }
         if (count($adjustments) > 0) {
             $asset->addAdjustments($adjustments);
         }
     }
     return $asset;
 }