pu.RedLib

Class CollectionJoin<T>

java.lang.Object

pu.RedLib.CollectionJoin<T>

All Implemented Interfaces:

Reduction<java.util.Collection<T>>

public class CollectionJoin<T>
extends java.lang.Object
implements Reduction<java.util.Collection<T>>

A join operation adds every element of the second collection to the first collection, even if it already exists. However, the same operation cannot be replicated for sets, since sets cannot have duplicate elements.

Since:

4/12/2014

Author:

Mostafa Mehrabi

Field Summary

Fields inherited from interface pu.RedLib.Reduction

ArrayCOMBINE, BooleanBITAND, BooleanBITOR, BooleanBITXOR, BooleanLOGAND, BooleanLOGOR, ByteBITAND, ByteBITOR, ByteBITXOR, ByteMAX, ByteMIN, ByteMINUS, ByteMULTI, ByteSUM, DoubleBITAND, DoubleBITOR, DoubleBITXOR, DoubleLOGAND, DoubleLOGOR, DoubleMAX, DoubleMIN, DoubleMINUS, DoubleMULTI, DoubleSUM, FloatMAX, FloatMIN, FloatMINUS, FloatMULTI, FloatSUM, IntegerBITAND, IntegerBITOR, IntegerBITXOR, IntegerLOGAND, IntegerLOGOR, IntegerMAX, IntegerMIN, IntegerMINUS, IntegerMULTI, IntegerSUM, LongBITAND, LongBITOR, LongBITXOR, LongLOGOR, LongMAX, LongMIN, LongMINUS, LongMULTI, LongSUM, ShortBITAND, ShortBITOR, ShortBITXOR, ShortMAX, ShortMIN, ShortMINUS, ShortMULTI, ShortSUM

Constructor Summary

Constructors

Constructor and Description
CollectionJoin()

Method Summary

Modifier and Type	Method and Description
java.util.Collection<T>	reduce(java.util.Collection<T> first, java.util.Collection<T> second) Specifies a reduction as defined by 2 elements into 1.

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionJoin

public CollectionJoin()

Method Detail

reduce

public java.util.Collection<T> reduce(java.util.Collection<T> first,
                                      java.util.Collection<T> second)

Description copied from interface: Reduction

Specifies a reduction as defined by 2 elements into 1. The reduction must obey the following 2 constraints:

• Associative: the order of evaluating the reduction makes no difference, and
• Commutative: the order of the thread-local values makes no difference.

Specified by:

reduce in interface Reduction<java.util.Collection<T>>

Parameters:

first - The first element in the reduction.

second - The second element in the reduction.

Returns:

The result of reducing first with second.