org.geotools.filter.function

Class Collection_CountFunction

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

Collection_CountFunction

All Implemented Interfaces:

Factory, FunctionExpression, Expression, Function

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 and Description
static FunctionName	NAME

Fields inherited from class FunctionExpressionImpl

fallback, functionName, name, params

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor and Description
Collection_CountFunction() Creates a new instance of Collection_CountFunction

Method Summary

Modifier and Type	Method and 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 Detail

NAME

public static FunctionName NAME

Constructor Detail

Collection_CountFunction

public Collection_CountFunction()

Creates a new instance of Collection_CountFunction

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

Overrides:

evaluate in class FunctionExpressionImpl

Returns:

default implementation returns null