question: public QueryTask waitForQueryTask ( URI uri , TaskState . TaskStage expectedStage ) { List < TaskState . TaskStage > finalTaskStages = Arrays . asList ( TaskState . TaskStage . CANCELLED , TaskState . TaskStage . FAILED , TaskState . TaskStage . FINISHED , expectedStage ) ; String error = String . format ( "Task did not reach expected state %s" , expectedStage ) ; Object [ ] r = new Object [ 1 ] ; final URI finalUri = uri ; waitFor ( error , null ) ; return ( QueryTask ) r [ 0 ] ; }
target:  Helper method that waits for a query task to reach the expected stage