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:

Delegate<M,Iterator<V>>

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

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

Author:

rferranti

Constructor Summary

Constructors

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

Method Summary

Methods

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

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupBy

public GroupBy(Delegate<K,V> grouper,
       Provider<C> collectionProvider,
       Provider<M> mapProvider)

Method Detail

perform

public M perform(Iterator<V> groupies)

Specified by:

perform in interface Delegate<M extends Map<K,C>,Iterator<V>>