PropertyExistsFunction (Geotools modules 30-SNAPSHOT API)

Object
- ExpressionAbstract
- - DefaultExpression
  - - FunctionExpressionImpl
    - - PropertyExistsFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function
```
public class PropertyExistsFunction
extends FunctionExpressionImpl
```
A new function to check if a property exists.

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

PropertyExistsFunction()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`evaluate(Object bean)`	Subclass should override, default implementation returns null.
`Object`	`evaluate(SimpleFeature feature)`

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
  - PropertyExistsFunction
```
public PropertyExistsFunction()
```
- Method Detail
  - evaluate
```
public Object evaluate(SimpleFeature feature)
```
    Returns:
    
    Boolean.TRUE if the feature's FeatureType contains an attribute named as the property name passed as this function argument, Boolean.FALSE otherwise.
  - evaluate
```
public Object evaluate(Object bean)
```
    Description copied from class: ExpressionAbstract
    
    Subclass should override, default implementation returns null.
    
    Specified by:
    
    evaluate in interface Expression
    
    Overrides:
    
    evaluate in class FunctionExpressionImpl
    
    Returns:
    
    Boolean.TRUE if the Class of the object passed as argument defines a property names as the property name passed as this function argument, following the standard Java Beans naming conventions for getters. Boolean.FALSE otherwise.