trait EntityTypeEventSubscriberTrait

trait EntityTypeEventSubscriberTrait {
    
    /**
     * Gets the subscribed events.
     *
     * @return array
     *   An array of subscribed event names.
     *
     * @see \Symfony\Component\EventDispatcher\EventSubscriberInterface::getSubscribedEvents()
     */
    public static function getEntityTypeEvents() {
        $event = [
            'onEntityTypeEvent',
            100,
        ];
        $events[EntityTypeEvents::CREATE][] = $event;
        $events[EntityTypeEvents::UPDATE][] = $event;
        $events[EntityTypeEvents::DELETE][] = $event;
        return $events;
    }
    
    /**
     * Listener method for any entity type definition event.
     *
     * @param \Drupal\Core\Entity\EntityTypeEvent $event
     *   The field storage definition event object.
     * @param string $event_name
     *   The event name.
     */
    public function onEntityTypeEvent(EntityTypeEvent $event, $event_name) {
        switch ($event_name) {
            case EntityTypeEvents::CREATE:
                $this->onEntityTypeCreate($event->getEntityType());
                break;
            case EntityTypeEvents::UPDATE:
                $this->onEntityTypeUpdate($event->getEntityType(), $event->getOriginal());
                break;
            case EntityTypeEvents::DELETE:
                $this->onEntityTypeDelete($event->getEntityType());
                break;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function onEntityTypeCreate(EntityTypeInterface $entity_type) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function onFieldableEntityTypeCreate(EntityTypeInterface $entity_type, array $field_storage_definitions) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function onEntityTypeUpdate(EntityTypeInterface $entity_type, EntityTypeInterface $original) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function onFieldableEntityTypeUpdate(EntityTypeInterface $entity_type, EntityTypeInterface $original, array $field_storage_definitions, array $original_field_storage_definitions, array &$sandbox = NULL) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function onEntityTypeDelete(EntityTypeInterface $entity_type) {
    }

}