Package org.apache.flink.streaming.api.functions.windowing.delta

Class EuclideanDistance<DATA>

java.lang.Object

org.apache.flink.streaming.api.functions.windowing.delta.ExtractionAwareDeltaFunction<DATA,double[]>

org.apache.flink.streaming.api.functions.windowing.delta.EuclideanDistance<DATA>

Type Parameters:

DATA - The input data type. This delta function works with a double[], but can extract/convert to it from any other given object in case the respective extractor has been set. See ExtractionAwareDeltaFunction for more information.

All Implemented Interfaces:

Serializable, DeltaFunction<DATA>

@PublicEvolving
public class EuclideanDistance<DATA>
extends ExtractionAwareDeltaFunction<DATA,double[]>

This delta function calculates the euclidean distance between two given points.

Euclidean distance: http://en.wikipedia.org/wiki/Euclidean_distance

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
EuclideanDistance()
EuclideanDistance(Extractor<DATA,double[]> converter)

Method Summary

Modifier and Type	Method	Description
double	getNestedDelta(double[] oldDataPoint, double[] newDataPoint)	This method is exactly the same as DeltaFunction.getDelta(Object, Object) except that it gets the result of the previously done extractions as input.

Methods inherited from class org.apache.flink.streaming.api.functions.windowing.delta.ExtractionAwareDeltaFunction

getDelta

Methods inherited from class java.lang.Object

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

Constructor Details

EuclideanDistance

public EuclideanDistance()

EuclideanDistance

public EuclideanDistance(Extractor<DATA,double[]> converter)

Method Details

getNestedDelta

public double getNestedDelta(double[] oldDataPoint,
 double[] newDataPoint)

Description copied from class: ExtractionAwareDeltaFunction

This method is exactly the same as DeltaFunction.getDelta(Object, Object) except that it gets the result of the previously done extractions as input. Therefore, this method only does the actual calculation of the delta but no data extraction or conversion.

Specified by:

getNestedDelta in class ExtractionAwareDeltaFunction<DATA,double[]>

Parameters:

oldDataPoint - the older data point.

newDataPoint - the new data point.

Returns:

the delta between the two points.