question: @ SuppressWarnings ( "unused" ) private boolean checkSetShape ( Shape oldShape , Shape newShape ) { Shape currentShape = getShape ( ) ; assert oldShape != newShape : "Wrong old shape assumption?" ; assert newShape != currentShape : "Redundant shape change? shape=" + currentShape ; assert oldShape == currentShape || oldShape . getParent ( ) == currentShape : "Out-of-order shape change?" + "\nparentShape=" + currentShape + "\noldShape=" + oldShape + "\nnewShape=" + newShape ; return true ; }
target:  Check whether fast transition is valid.