org.geotools.filter.function

Class AbstractQuantityClassificationFunction

Object

ExpressionAbstract

DefaultExpression

ClassificationFunction

AbstractQuantityClassificationFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function

Direct Known Subclasses:

EqualAreaFunction, QuantileFunction

public abstract class AbstractQuantityClassificationFunction
extends ClassificationFunction

Field Summary

Fields inherited from class ClassificationFunction

LOGGER

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor and Description
AbstractQuantityClassificationFunction(FunctionName name)

Method Summary

Modifier and Type	Method and Description
Object	evaluate(Object feature) Subclass should override, default implementation returns null.
protected abstract FeatureCalc	getListVisitor() Returns the list visitor for the specific implementation of "quantity" (e.g., count, area, ...).
protected abstract boolean	percentages()

Methods inherited from class ClassificationFunction

accept, computeGroupByPercentages, computePercentage, 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

Constructor Detail

AbstractQuantityClassificationFunction

public AbstractQuantityClassificationFunction(FunctionName name)

Method Detail

getListVisitor

protected abstract FeatureCalc getListVisitor()

Returns the list visitor for the specific implementation of "quantity" (e.g., count, area, ...). The visitor must return a "bins" structure matching {code}List[]{code}, where each array entry is a bin, and values inside the bin are sorted from lowest to highest

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

percentages

protected abstract boolean percentages()

Returns:

true if percentages computation is enabled, false if not