class MigrateEvents

final class MigrateEvents {
    
    /**
     * Name of the event fired when saving to a migration's map.
     *
     * This event allows modules to perform an action whenever the disposition of
     * an item being migrated is saved to the map table. The event listener method
     * receives a \Drupal\migrate\Event\MigrateMapSaveEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateMapSaveEvent
     *
     * @var string
     */
    const MAP_SAVE = 'migrate.map_save';
    
    /**
     * Name of the event fired when removing an entry from a migration's map.
     *
     * This event allows modules to perform an action whenever a row is deleted
     * from a migration's map table (implying it has been rolled back). The event
     * listener method receives a \Drupal\migrate\Event\MigrateMapDeleteEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateMapDeleteEvent
     *
     * @var string
     */
    const MAP_DELETE = 'migrate.map_delete';
    
    /**
     * Name of the event fired when beginning a migration import operation.
     *
     * This event allows modules to perform an action whenever a migration import
     * operation is about to begin. The event listener method receives a
     * \Drupal\migrate\Event\MigrateImportEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateImportEvent
     *
     * @var string
     */
    const PRE_IMPORT = 'migrate.pre_import';
    
    /**
     * Name of the event fired when finishing a migration import operation.
     *
     * This event allows modules to perform an action whenever a migration import
     * operation is completing. The event listener method receives a
     * \Drupal\migrate\Event\MigrateImportEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateImportEvent
     *
     * @var string
     */
    const POST_IMPORT = 'migrate.post_import';
    
    /**
     * Name of the event fired when about to import a single item.
     *
     * This event allows modules to perform an action whenever a specific item
     * is about to be saved by the destination plugin. The event listener method
     * receives a \Drupal\migrate\Event\MigratePreRowSaveEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigratePreRowSaveEvent
     *
     * @var string
     */
    const PRE_ROW_SAVE = 'migrate.pre_row_save';
    
    /**
     * Name of the event fired just after a single item has been imported.
     *
     * This event allows modules to perform an action whenever a specific item
     * has been saved by the destination plugin. The event listener method
     * receives a \Drupal\migrate\Event\MigratePostRowSaveEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigratePostRowSaveEvent
     *
     * @var string
     */
    const POST_ROW_SAVE = 'migrate.post_row_save';
    
    /**
     * Name of the event fired when beginning a migration rollback operation.
     *
     * This event allows modules to perform an action whenever a migration
     * rollback operation is about to begin. The event listener method receives a
     * \Drupal\migrate\Event\MigrateRollbackEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateRollbackEvent
     *
     * @var string
     */
    const PRE_ROLLBACK = 'migrate.pre_rollback';
    
    /**
     * Name of the event fired when finishing a migration rollback operation.
     *
     * This event allows modules to perform an action whenever a migration
     * rollback operation is completing. The event listener method receives a
     * \Drupal\migrate\Event\MigrateRollbackEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateRollbackEvent
     *
     * @var string
     */
    const POST_ROLLBACK = 'migrate.post_rollback';
    
    /**
     * Name of the event fired when about to delete a single item.
     *
     * This event allows modules to perform an action whenever a specific item
     * is about to be deleted by the destination plugin. The event listener method
     * receives a \Drupal\migrate\Event\MigrateRowDeleteEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateRowDeleteEvent
     *
     * @var string
     */
    const PRE_ROW_DELETE = 'migrate.pre_row_delete';
    
    /**
     * Name of the event fired just after a single item has been deleted.
     *
     * This event allows modules to perform an action whenever a specific item
     * has been deleted by the destination plugin. The event listener method
     * receives a \Drupal\migrate\Event\MigrateRowDeleteEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateRowDeleteEvent
     *
     * @var string
     */
    const POST_ROW_DELETE = 'migrate.post_row_delete';
    
    /**
     * Name of the event fired when saving a message to the ID map.
     *
     * This event allows modules to perform an action whenever a message is being
     * logged by the ID map. The event listener method receives a
     * \Drupal\migrate\Event\MigrateIdMapMessageEvent instance.
     *
     * @Event
     *
     * @see \Drupal\migrate\Event\MigrateIdMapMessageEvent
     *
     * @var string
     */
    const IDMAP_MESSAGE = 'migrate.idmap_message';

}