MaskEntityTrait.php

<?php

namespace Drupal\ctools_entity_mask;


/**
 * Provides common functionality for mask entities.
 */
trait MaskEntityTrait {
    
    /**
     * Implements \Drupal\Core\Entity\EntityInterface::id().
     *
     * Mask entities are generally not saved to the database like standard content
     * entities, so it cannot be assumed that they will have a serial ID at any
     * point in their lives. However, Drupal still expects all entities to have an
     * identifier of some kind, so this dual-purposes the UUID as the canonical
     * entity ID. (It would be nice if core did this as a rule for all entities
     * and stopped using serial IDs, but, y'know, baby steps.)
     *
     * @return string
     *   Returns the UUID of the Entity.
     */
    public function id() {
        return $this->uuid();
    }

}