co.cask.cdap.dq.functions

Class DiscreteValuesHistogram

java.lang.Object

co.cask.cdap.dq.functions.DiscreteValuesHistogram

All Implemented Interfaces:

BasicAggregationFunction, CombinableAggregationFunction<Map<String,Integer>>

public class DiscreteValuesHistogram
extends Object
implements BasicAggregationFunction, CombinableAggregationFunction<Map<String,Integer>>

Discrete Values Histogram Aggregation Function

Constructor Summary

Constructors

Constructor and Description
DiscreteValuesHistogram()

Method Summary

Methods

Modifier and Type	Method and Description
void	add(DataQualityWritable value) Incrementally add values to the aggregation
byte[]	aggregate() Return the aggregation accumulated using add() in the form of a byte[]
void	combine(byte[] value) Combine existing aggregations one-by-one
Map<String,Integer>	deserialize(byte[] valueBytes) Deserialize a given value appropriately
Map<String,Integer>	retrieveAggregation() Retrieve a combined aggregation

Methods inherited from class java.lang.Object

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

Constructor Detail

DiscreteValuesHistogram

public DiscreteValuesHistogram()

Method Detail

combine

public void combine(byte[] value)

Description copied from interface: CombinableAggregationFunction

Combine existing aggregations one-by-one

Specified by:

combine in interface CombinableAggregationFunction<Map<String,Integer>>

deserialize

public Map<String,Integer> deserialize(byte[] valueBytes)

Description copied from interface: BasicAggregationFunction

Deserialize a given value appropriately

Specified by:

deserialize in interface BasicAggregationFunction

retrieveAggregation

public Map<String,Integer> retrieveAggregation()

Description copied from interface: CombinableAggregationFunction

Retrieve a combined aggregation

Specified by:

retrieveAggregation in interface CombinableAggregationFunction<Map<String,Integer>>

add

public void add(DataQualityWritable value)

Description copied from interface: BasicAggregationFunction

Incrementally add values to the aggregation

Specified by:

add in interface BasicAggregationFunction

aggregate

public byte[] aggregate()

Description copied from interface: BasicAggregationFunction

Return the aggregation accumulated using add() in the form of a byte[]

Specified by:

aggregate in interface BasicAggregationFunction