class FieldStorageDefinitionEvent

class FieldStorageDefinitionEvent extends Event {
    
    /**
     * The field storage definition.
     *
     * @var \Drupal\Core\Field\FieldStorageDefinitionInterface
     */
    protected $fieldStorageDefinition;
    
    /**
     * The original field storage definition.
     *
     * @var \Drupal\Core\Field\FieldStorageDefinitionInterface
     */
    protected $original;
    
    /**
     * Constructs a new FieldStorageDefinitionEvent.
     *
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $field_storage_definition
     *   The field storage definition.
     * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $original
     *   (optional) The original field storage definition. This should be passed
     *   only when updating the storage definition.
     */
    public function __construct(FieldStorageDefinitionInterface $field_storage_definition, FieldStorageDefinitionInterface $original = NULL) {
        $this->fieldStorageDefinition = $field_storage_definition;
        $this->original = $original;
    }
    
    /**
     * The field storage definition.
     *
     * @return \Drupal\Core\Field\FieldStorageDefinitionInterface
     */
    public function getFieldStorageDefinition() {
        return $this->fieldStorageDefinition;
    }
    
    /**
     * The original field storage definition.
     *
     * @return \Drupal\Core\Field\FieldStorageDefinitionInterface
     */
    public function getOriginal() {
        return $this->original;
    }

}