Module org.microbean.bean

Package org.microbean.bean

Interface Reducible<C,T>

Type Parameters:

C - the type of criteria

T - the element type

All Known Implementing Classes:

Beans

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Reducible<C,T>

A functional interface whose implementations can reduce an unspecified notional collection of elements to a single element according to some criteria.

This interface is related to, but should not be confused with, the Reducer interface, which can be used to build Reducible instances.

Author:

Laird Nelson

See Also:

• reduce(Object)
• Reducer

Method Summary

Modifier and Type	Method	Description
static <C, E> Reducible<C,E>	of(Selectable<C,E> selectable, Reducer<C,E> r)
static <C, E> Reducible<C,E>	of(Selectable<C,E> selectable, Reducer<C,E> r, BiFunction<? super List<? extends E>,? super C,? extends E> failureHandler)
static <C, E> Reducible<C,E>	ofCaching(Selectable<C,E> selectable, Reducer<C,E> r)
static <C, E> Reducible<C,E>	ofCaching(Selectable<C,E> selectable, Reducer<C,E> r, BiFunction<? super List<? extends E>,? super C,? extends E> failureHandler)
static <C, E> Reducible<C,E>	ofCaching(Selectable<C,E> selectable, Reducer<C,E> r, BiFunction<? super List<? extends E>,? super C,? extends E> failureHandler, BiFunction<? super C,Function<C,E>,? extends E> computeIfAbsent)
T	reduce(C criteria)	Given a criteria object, which may be null, returns an object that represents the reduction of a notional collection of objects.

Method Details

reduce

T reduce(C criteria)

Given a criteria object, which may be null, returns an object that represents the reduction of a notional collection of objects.

Most Reducible implementations will return determine values from invocations of this method, but there is no requirement to do so.

Parameters:

criteria - the criteria; may be null to indicate no criteria

Returns:

a single object, or null

Throws:

ReductionException - if reduction could not occur or if an error occurs

of

static <C,
E> Reducible<C,E> of(Selectable<C,E> selectable,
 Reducer<C,E> r)

of

static <C,
E> Reducible<C,E> of(Selectable<C,E> selectable,
 Reducer<C,E> r,
 BiFunction<? super List<? extends E>,? super C,? extends E> failureHandler)

ofCaching

static <C,
E> Reducible<C,E> ofCaching(Selectable<C,E> selectable,
 Reducer<C,E> r)

ofCaching

static <C,
E> Reducible<C,E> ofCaching(Selectable<C,E> selectable,
 Reducer<C,E> r,
 BiFunction<? super List<? extends E>,? super C,? extends E> failureHandler)

ofCaching

static <C,
E> Reducible<C,E> ofCaching(Selectable<C,E> selectable,
 Reducer<C,E> r,
 BiFunction<? super List<? extends E>,? super C,? extends E> failureHandler,
 BiFunction<? super C,Function<C,E>,? extends E> computeIfAbsent)