net.emaze.dysfunctional.groups

Class GroupBy<M extends Map<K,C>,C extends Collection<V>,K,V>

java.lang.Object

net.emaze.dysfunctional.groups.GroupBy<M,C,K,V>

Type Parameters:

M - the map type

C - the collection type

K - the map key type

V - the map value type

All Implemented Interfaces:

Function<Iterator<V>,M>

public class GroupBy<M extends Map<K,C>,C extends Collection<V>,K,V>
extends Object
implements Function<Iterator<V>,M>

A unary function grouping elements from an iterator. Group key is provided by the passed function.

Author:

rferranti

Constructor Summary

Constructors

Constructor and Description
GroupBy(Function<V,K> grouper, Supplier<C> collectionProvider, Supplier<M> mapProvider)

Method Summary

Modifier and Type	Method and Description
M	apply(Iterator<V> groupies)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

GroupBy

public GroupBy(Function<V,K> grouper,
               Supplier<C> collectionProvider,
               Supplier<M> mapProvider)

Method Detail

apply

public M apply(Iterator<V> groupies)

Specified by:

apply in interface Function<Iterator<V>,M extends Map<K,C>>