org.geotools.filter.function
Class PropertyExistsFunction
Object
ExpressionAbstract
DefaultExpression
FunctionExpressionImpl
PropertyExistsFunction
- All Implemented Interfaces:
- Factory, ExpressionType, FunctionExpression, Expression, Function
public class PropertyExistsFunction
- extends FunctionExpressionImpl
A new function to check if a property exists.
Fields inherited from interface ExpressionType |
ATTRIBUTE, ATTRIBUTE_DOUBLE, ATTRIBUTE_GEOMETRY, ATTRIBUTE_INTEGER, ATTRIBUTE_STRING, ATTRIBUTE_UNDECLARED, FUNCTION, LITERAL_DOUBLE, LITERAL_GEOMETRY, LITERAL_INTEGER, LITERAL_LONG, LITERAL_STRING, LITERAL_UNDECLARED, MATH_ADD, MATH_DIVIDE, MATH_MULTIPLY, MATH_SUBTRACT |
Methods inherited from class FunctionExpressionImpl |
accept, functionName, getArgCount, getArgs, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, getType, setArgs, setFallbackValue, setName, setParameters |
NAME
public static FunctionName NAME
PropertyExistsFunction
public PropertyExistsFunction()
evaluate
public Object evaluate(SimpleFeature feature)
- Description copied from class:
DefaultExpression
- Returns a value for this expression. If the expression is an attribute
expression then the attribute of the feature should be returned. If a
literal then the feature is ignored, the literal is returned as it has
no relation to the feature.
- Overrides:
evaluate
in class DefaultExpression
- Parameters:
feature
- Specified feature to use when returning value.
- 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:
DefaultExpression
- This method checks if the object is an instance of
Feature
and
if so, calls through to #evaluate(Feature)
. This is done
to maintain backwards compatability with previous version of Expression api
which depended on Feature. If the object is not an instance of feature
the super implementation is called.
- Specified by:
evaluate
in interface Expression
- Overrides:
evaluate
in class DefaultExpression
- 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.
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
equals
public boolean equals(Object obj)
- Overrides:
equals
in class FunctionExpressionImpl
Copyright © 1996-2014 Geotools. All Rights Reserved.