eu.bandm.tools.ops

Interface Consumer<D,S>

All Known Subinterfaces:

InitConsumer<D,S>

public interface Consumer<D,S>

A parametrized action on a stateful class. Action may be by side-effect modification , cloning derivation or any other polymorphic technique. The static type of the state object must not change.

Protypic instances of consumers are setter methods, I/O write operations and collection updates such as .

Method Summary

Modifier and Type	Method and Description
<T extends S> T	consume(D argument, T state) Act on something.

Method Detail

consume

<T extends S> T consume(D argument,
                        T state)

Act on something.

Parameters:

T - the static type of the state that is invariant under the action

argument - the parameter value

state - the pre-state. This object may be modified if and only if it is also returned.

Returns:

the post-state, either the same object as state or type-equivalent.