Package org.geotools.filter.function.string

Class ConcatenateFunction

Object

ExpressionAbstract

FunctionImpl

ConcatenateFunction

All Implemented Interfaces:

Expression, Function

public class ConcatenateFunction
extends FunctionImpl

The function concatenates strings.

It is used to create concatenated strings as arguments of functions.

Implementation of Concatenate as defined by SE1.1.

Author:

Jody Garnett (Refractions Research, Inc.)

Field Summary

Fields

Modifier and Type	Field	Description
static final FunctionName	NAME	Make the instance of FunctionName available in a consistent spot.

Fields inherited from class FunctionImpl

functionName

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor	Description
ConcatenateFunction()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object feature)	Default implementation simply returns the fallbackValue.
int	getArgCount()
String	getName()	Gets the name of this function.

Methods inherited from class FunctionImpl

accept, dispatchArguments, equals, functionName, getFallbackValue, getFunctionName, getParameters, getParameterValue, getParameterValue, hashCode, setFallbackValue, setName, setParameters, toString

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 final FunctionName NAME

Make the instance of FunctionName available in a consistent spot.

Constructor Details

ConcatenateFunction

public ConcatenateFunction()

Method Details

getName

public String getName()

Description copied from class: FunctionImpl

Gets the name of this function.

Specified by:

getName in interface Function

Overrides:

getName in class FunctionImpl

Returns:

the name of the function.

getArgCount

public int getArgCount()

evaluate

public Object evaluate(Object feature)

Description copied from class: FunctionImpl

Default implementation simply returns the fallbackValue.

Please override this method to produce a value based on the provided arguments.

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class FunctionImpl

Parameters:

feature - Object being evaluated; often a Feature

Returns:

value for the provided object