question: private void changeValue ( AbstractStorageLabel < Object > label , Object newValue ) { if ( ! Objects . equals ( label . getValue ( ) , newValue ) ) { synchronized ( labelEditListeners ) { for ( LabelEditListener listener : labelEditListeners ) { listener . preLabelValueChange ( label ) ; } } label . setValue ( newValue ) ; synchronized ( labelEditListeners ) { for ( LabelEditListener listener : labelEditListeners ) { listener . postLabelValueChange ( label ) ; } } } }
target:  Reforms the value change and informs the listeners.