uk.ac.ed.epcc.webapp.forms.transition

Interface TransitionVisitor<X>

Type Parameters:

X -

All Known Implementing Classes:

AbstractTransitionVisitor, DirectOperationTransitionVisitor, ServletTransitionVisitor, ShortcutServletTransitionVisitor, SwingTransitionVisitor

public interface TransitionVisitor<X>

Visitor to actually implement the transition logic. All changes to model state should take place within the TransitionVisitor. This returns a FormResult that encodes the new view/display state that should be implemented by a FormResultVisitor. The visitor pattern is used to ensure an explicit dependency between the types of Transition and the code that has to implement logic on them. Any additional Transition sub-types will either extend an existing type and use its implementation method or require a change to the visitor interface.

Method Summary

Modifier and Type	Method and Description
FormResult	doDirectTargetlessTransition(DirectTargetlessTransition<X> t)
FormResult	doDirectTransition(DirectTransition<X> t)
FormResult	doFormTransition(FormTransition<X> t)
FormResult	doTargetLessTransition(TargetLessTransition<X> t)
FormResult	doValidatingFormTransition(ValidatingFormTransition<X> t)

Method Detail

doDirectTransition

FormResult doDirectTransition(DirectTransition<X> t)
                       throws TransitionException

Throws:

TransitionException

doDirectTargetlessTransition

FormResult doDirectTargetlessTransition(DirectTargetlessTransition<X> t)
                                 throws TransitionException

Throws:

TransitionException

doFormTransition

FormResult doFormTransition(FormTransition<X> t)
                     throws TransitionException

Throws:

TransitionException

doValidatingFormTransition

FormResult doValidatingFormTransition(ValidatingFormTransition<X> t)
                               throws TransitionException

Throws:

TransitionException

doTargetLessTransition

FormResult doTargetLessTransition(TargetLessTransition<X> t)
                           throws TransitionException

Throws:

TransitionException