org.wandora.utils

Interface Delegate<R,P>

All Known Implementing Classes:

LayeredTopic.TopicKeyMaker, LayerStack.TopicAndLayerKeyMaker

public interface Delegate<R,P>

Delegate is a function wrapped in an Object. Normally you will want to make an anonymous inner class implementing Delegate and pass that object somewhere. Delegate can be used as a generic listener (the delegate is invoked on an event) or some kind of other handler. If you need to use more than one parameter, you can use the com.gripstudios.utils.Tuples library.

If your delegate doesn't return a value, you can set it to return Object and then just return null or you can set the return value to Delegate.Void and return Delegate.VOID to make it clear that the return value means nothing.

Using Delegate class you can use some programming techniques readily available in functional programming languages allthough the syntax in Java becomes somewhat inconvenient.

Author:

olli

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Delegate.Void

Field Summary

Fields

Modifier and Type	Field and Description
static Delegate.Void	VOID

Method Summary

Modifier and Type	Method and Description
R	invoke(P param)

Field Detail

VOID

static final Delegate.Void VOID

Method Detail

invoke

R invoke(P param)