IDFunction (Geotools modules 31-SNAPSHOT API)

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

All Methods Instance Methods Concrete Methods
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 Detail
  - NAME
```
public static FunctionName NAME
```
- Constructor Detail
  - IDFunction
```
public IDFunction()
```
- Method Detail
  - 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