RevisionableContentEntityBase.php

<?php

namespace Drupal\Core\Entity;


/**
 * Provides a content entity with extended support for revisions.
 *
 * In addition to the parent entity class, base fields and methods for
 * accessing the revision log message, revision owner and the revision creation
 * time are provided.
 *
 * @ingroup entity_api
 */
abstract class RevisionableContentEntityBase extends ContentEntityBase implements RevisionLogInterface {
    use RevisionLogEntityTrait;
    
    /**
     * {@inheritdoc}
     */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
        $fields = parent::baseFieldDefinitions($entity_type);
        $fields += static::revisionLogBaseFieldDefinitions($entity_type);
        return $fields;
    }

}