edu.tum.cs.commons.math
Class PairwiseAggregatorBase

java.lang.Object
  edu.tum.cs.commons.math.PairwiseAggregatorBase

All Implemented Interfaces:

IAggregator

Direct Known Subclasses:

MaxAggregator, MinAggregator, SumAggregator

public abstract class PairwiseAggregatorBase
extends Object
implements IAggregator

This is a base class for aggregators that have a defined neutral element and operate in pairwise manner.

Version:

$Rev: 28099 $

Author:

Florian Deissenboeck, $Author: hummelb $

Rating:

GREEN Hash: B262E418EFDA28F4B7634AA5FDDFD68E

Constructor Summary

PairwiseAggregatorBase()

Method Summary

double	aggregate(Collection<? extends Number> values) Aggregate collection of values to one value.
protected abstract double	aggregate(double aggregate, double value) Calculate aggregate of two values.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.tum.cs.commons.math.IAggregator

getNeutralElement

Constructor Detail

PairwiseAggregatorBase

public PairwiseAggregatorBase()

Method Detail

aggregate

public double aggregate(Collection<? extends Number> values)

Aggregate collection of values to one value. Implementing classes may return non-normal numbers, e.g. Double.NaN for the median of an empty collections.

Specified by:

aggregate in interface IAggregator

aggregate

protected abstract double aggregate(double aggregate,
                                    double value)

Calculate aggregate of two values.

Parameters:

aggregate - the value that has been aggregated by previous pairwise aggregations

value - the new value