org.geotools.filter.function

Class PropertyExistsFunction

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 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
PropertyExistsFunction()

Method Summary

Modifier and Type	Method and 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.