EntityTypeEvent.php

<?php

namespace Drupal\Core\Entity;

use Drupal\Component\EventDispatcher\Event;

/**
 * Defines a base class for all entity type events.
 */
class EntityTypeEvent extends Event {
    
    /**
     * The entity type.
     *
     * @var \Drupal\Core\Entity\EntityTypeInterface
     */
    protected $entityType;
    
    /**
     * The original entity type.
     *
     * @var \Drupal\Core\Entity\EntityTypeInterface
     */
    protected $original;
    
    /**
     * Constructs a new EntityTypeEvent.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The field storage definition.
     * @param \Drupal\Core\Entity\EntityTypeInterface $original
     *   (optional) The original entity type. This should be passed only when
     *   updating the entity type.
     */
    public function __construct(EntityTypeInterface $entity_type, ?EntityTypeInterface $original = NULL) {
        $this->entityType = $entity_type;
        $this->original = $original;
    }
    
    /**
     * The entity type the event refers to.
     *
     * @return \Drupal\Core\Entity\EntityTypeInterface
     */
    public function getEntityType() {
        return $this->entityType;
    }
    
    /**
     * The original entity type.
     *
     * @return \Drupal\Core\Entity\EntityTypeInterface
     */
    public function getOriginal() {
        return $this->original;
    }

}