org.jaitools.numeric
Class ExactMedianProcessor

java.lang.Object
  org.jaitools.numeric.AbstractProcessor
      org.jaitools.numeric.ExactMedianProcessor

All Implemented Interfaces:

Processor

public class ExactMedianProcessor
extends AbstractProcessor

Processor for the exact median Statistic.MEDIAN.

Note: this processor stores sll accepted sample values in memory in order to calculate the exact median. For very large data streams Statistic.APPROX_MEDIAN might be preferred.

Since:

1.0

Version:

$Id$

Author:

Michael Bedward

See Also:

Statistic, StreamingSampleStats

Field Summary

Fields inherited from class org.jaitools.numeric.AbstractProcessor

numAccepted, numNaN, numNoData, numOffered

Constructor Summary

ExactMedianProcessor()

Method Summary

Double	get(Statistic stat) Gets the value of the statistic calculated by this processor.
Collection<Statistic>	getSupported() Gets the Statistics supported by this processor.
void	offer(Double sample) Offers a sample value to the processor.
protected boolean	update(Double sample) Processes a sample value.

Methods inherited from class org.jaitools.numeric.AbstractProcessor

addNoDataRange, addNoDataValue, addRange, addRange, get, getNoDataRanges, getNumAccepted, getNumNaN, getNumNoData, getNumOffered, getRanges, getRangesType, isAccepted, setRangesType

Methods inherited from class java.lang.Object

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

Constructor Detail

ExactMedianProcessor

public ExactMedianProcessor()

Method Detail

getSupported

public Collection<Statistic> getSupported()

Gets the Statistics supported by this processor.

Returns:

supported Statistics

offer

public final void offer(Double sample)

Offers a sample value to the processor. The maximum number of sample values than can be stored is Integer.MAX_VALUE (available memory permitting). Once this limit is reached, subsequent values will be rejected and a warning message will be logged.

Specified by:

offer in interface Processor

Overrides:

offer in class AbstractProcessor

Parameters:

sample - the sample value

update

protected boolean update(Double sample)

Processes a sample value..

Specified by:

update in class AbstractProcessor

Parameters:

sample - the sample value

Returns:

true if the sample is accepted; false otherwise

get

public Double get(Statistic stat)

Gets the value of the statistic calculated by this processor..

Parameters:

stat - the specified statistic

Returns:

the value of the statistic if it has been calculated or Double.NaN otherwise