Package com.ssgllc.fish.f.list

Class ValueReducer<U,V>

java.lang.Object

com.ssgllc.fish.f.list.ValueReducer<U,V>

public class ValueReducer<U,V>
extends Object

A fold awaiting its initial value, produced by ListBuilder.reduce(java.util.List).

A null list is treated as empty, so a fold over an absent collection yields the initial value rather than failing.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ValueReducer.Reducer<U,V>

Constructor Summary

Constructors

Constructor	Description
ValueReducer(List<U> items)

Method Summary

Modifier and Type	Method	Description
List<ValueReducer.Reducer<U,V>>	startingWith(V initialValue)	Supplies the fold's initial value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ValueReducer

public ValueReducer(List<U> items)

Method Details

startingWith

public List<ValueReducer.Reducer<U,V>> startingWith(V initialValue)

Supplies the fold's initial value.

Returns a single-element list rather than the reducer itself, so a SpEL projection can be used to step into it - which is how the chain continues without a statement.

Parameters:

initialValue - the value the fold starts from

Returns:

a one-element list holding the reducer