org.apache.solr.analytics.statistics

Class NumericStatsCollector

java.lang.Object

org.apache.solr.analytics.statistics.MinMaxStatsCollector

org.apache.solr.analytics.statistics.NumericStatsCollector

All Implemented Interfaces:

StatsCollector

public class NumericStatsCollector
extends MinMaxStatsCollector

NumericStatsCollector computes the sum, sum of squares, mean and standard deviation.

Field Summary

Fields

Modifier and Type	Field and Description
protected double	mean
protected double	stddev
protected double	sum
protected double	sumOfSquares

Fields inherited from class org.apache.solr.analytics.statistics.MinMaxStatsCollector

function, max, min, missingCount, source, statsList, value, valueCount, valueFiller

Constructor Summary

Constructors

Constructor and Description
NumericStatsCollector(ValueSource source, Set<String> statsList)

Method Summary

Methods

Modifier and Type	Method and Description
void	collect(int doc) Collect values from the value source and add to statistics.
void	compute() After all documents have been collected, this method should be called to finalize the calculations of each statistic.
Comparable	getStat(String stat) Return the value of the given statistic.

Methods inherited from class org.apache.solr.analytics.statistics.MinMaxStatsCollector

getFunction, getStatsList, getValue, setNextReader, statString, toString, valueSourceString

Methods inherited from class java.lang.Object

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

Field Detail

sum

protected double sum

sumOfSquares

protected double sumOfSquares

mean

protected double mean

stddev

protected double stddev

Constructor Detail

NumericStatsCollector

public NumericStatsCollector(ValueSource source,
                     Set<String> statsList)

Method Detail

collect

public void collect(int doc)

Description copied from interface: StatsCollector

Collect values from the value source and add to statistics.

Specified by:

collect in interface StatsCollector

Overrides:

collect in class MinMaxStatsCollector

Parameters:

doc - Document to collect from

getStat

public Comparable getStat(String stat)

Description copied from interface: StatsCollector

Return the value of the given statistic.

Specified by:

getStat in interface StatsCollector

Overrides:

getStat in class MinMaxStatsCollector

Parameters:

stat - the stat

Returns:

a comparable

compute

public void compute()

Description copied from interface: StatsCollector

After all documents have been collected, this method should be called to finalize the calculations of each statistic.

Specified by:

compute in interface StatsCollector

Overrides:

compute in class MinMaxStatsCollector