Package org.geotools.filter.function

Class Collection_CountFunction

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

Collection_CountFunction

All Implemented Interfaces:

Expression, Function, FunctionExpression, Factory

public class Collection_CountFunction
extends FunctionExpressionImpl

Calculates the count value of an attribute for a given SimpleFeatureCollection and Expression.

Since:

2.2M2

Author:

Cory Horner

Field Summary

Fields

Modifier and Type	Field	Description
static FunctionName	NAME

Fields inherited from class FunctionExpressionImpl

fallback, functionName, name, params

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor	Description
Collection_CountFunction()	Creates a new instance of Collection_CountFunction

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object feature)	Subclass should override, default implementation returns null.

Methods inherited from class FunctionExpressionImpl

accept, equals, functionName, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, hashCode, setFallbackValue, setParameters, toString

Methods inherited from class DefaultExpression

isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression

Methods inherited from class ExpressionAbstract

evaluate

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Expression

evaluate

Field Details

NAME

public static FunctionName NAME

Constructor Details

Collection_CountFunction

public Collection_CountFunction()

Creates a new instance of Collection_CountFunction

Method Details

evaluate

public Object evaluate(Object feature)

Description copied from class: ExpressionAbstract

Subclass should override, default implementation returns null.

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class FunctionExpressionImpl

Returns:

default implementation returns null