org.geotools.filter.function

Class StandardDeviationFunction

Object

ExpressionAbstract

DefaultExpression

ClassificationFunction

StandardDeviationFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function

public class StandardDeviationFunction
extends ClassificationFunction

Breaks a SimpleFeatureCollection into classes using the standard deviation classification method.

Author:

Cory Horner, Refractions Research Inc.

Field Summary

Fields

Modifier and Type	Field and Description
static FunctionName	NAME

Fields inherited from class ClassificationFunction

LOGGER

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor and Description
StandardDeviationFunction()

Method Summary

Modifier and Type	Method and Description
protected void	computePercentage(double[] percentages, double classMembers, double totalSize, int index) Compute the percentage from the input parameters, setting in the percentages array at the specified index
Object	evaluate(Object feature) Subclass should override, default implementation returns null.
protected boolean	percentages()

Methods inherited from class ClassificationFunction

accept, computeGroupByPercentages, decimalPlaces, fixRound, getClasses, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, getProgressListener, round, setClasses, setFallbackValue, setParameters, setProgressListener, toString

Methods inherited from class DefaultExpression

isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression

Methods inherited from class ExpressionAbstract

evaluate

Methods inherited from class Object

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

Methods inherited from interface Expression

evaluate

Field Detail

NAME

public static FunctionName NAME

Constructor Detail

StandardDeviationFunction

public StandardDeviationFunction()

Method Detail

evaluate

public Object evaluate(Object feature)

Description copied from class: ExpressionAbstract

Subclass should override, default implementation returns null.

Specified by:

evaluate in interface Expression

Specified by:

evaluate in class ClassificationFunction

Returns:

default implementation returns null

computePercentage

protected void computePercentage(double[] percentages,
                                 double classMembers,
                                 double totalSize,
                                 int index)

Description copied from class: ClassificationFunction

Compute the percentage from the input parameters, setting in the percentages array at the specified index

Overrides:

computePercentage in class ClassificationFunction

percentages

protected boolean percentages()