getOriginalEntity example

    $entity_type_id = $entity->getEntityTypeId();
    if (!$this->contentTranslationManager->isEnabled($entity_type_id, $entity->bundle())) {
      return;
    }
    $synchronized_properties = $this->getSynchronizedPropertiesByField($entity->getFieldDefinitions());
    if (!$synchronized_properties) {
      return;
    }

    /** @var \Drupal\Core\Entity\ContentEntityInterface $original */
    $original = $this->getOriginalEntity($entity);
    $original_translation = $this->getOriginalTranslation($entity, $original);
    if ($this->hasSynchronizedPropertyChanges($entity, $original_translation, $synchronized_properties)) {
      if ($entity->isDefaultTranslationAffectedOnly()) {
        foreach ($entity->getTranslationLanguages(FALSE) as $langcode => $language) {
          if ($entity->getTranslation($langcode)->hasTranslationChanges()) {
            $this->context->addViolation($constraint->defaultTranslationMessage);
            break;
          }
        }
      }
      else {
        

public function synchronizeFields(ContentEntityInterface $entity, $sync_langcode, $original_langcode = NULL) {
    $translations = $entity->getTranslationLanguages();

    // If we have no information about what to sync to, if we are creating a new     // entity, if we have no translations for the current entity and we are not     // creating one, then there is nothing to synchronize.     if (empty($sync_langcode) || $entity->isNew() || count($translations) < 2) {
      return;
    }

    // If the entity language is being changed there is nothing to synchronize.     $entity_unchanged = $this->getOriginalEntity($entity);
    if ($entity->getUntranslated()->language()->getId() != $entity_unchanged->getUntranslated()->language()->getId()) {
      return;
    }

    if ($entity->isNewRevision()) {
      if ($entity->isDefaultTranslationAffectedOnly()) {
        // If changes to untranslatable fields are configured to affect only the         // default translation, we need to skip synchronization in pending         // revisions, otherwise multiple translations would be affected.         if (!$entity->isDefaultRevision()) {
          return;
        }