Package org.geotools.filter.function

Class IDFunction

Object

ExpressionAbstract

DefaultExpression

FunctionExpressionImpl

IDFunction

All Implemented Interfaces:

Expression, Function, VolatileFunction, FunctionExpression, Factory

public class IDFunction
extends FunctionExpressionImpl
implements VolatileFunction

Allow access to the value of Feature.getID() as an expression

Since:

2.2, 2.5

Author:

Jody Garnett

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
IDFunction()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object obj)	Subclass should override, default implementation returns null.
String	toString()	Creates a String representation of this Function with the function name and the arguments.

Methods inherited from class FunctionExpressionImpl

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

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

accept, evaluate

Methods inherited from interface Function

getFallbackValue, getFunctionName, getName, getParameters

Field Details

NAME

public static FunctionName NAME

Constructor Details

IDFunction

public IDFunction()

Method Details

toString

public String toString()

Description copied from class: FunctionExpressionImpl

Creates a String representation of this Function with the function name and the arguments. The String created should be good for most subclasses

Overrides:

toString in class FunctionExpressionImpl

evaluate

public Object evaluate(Object obj)

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