Package org.geotools.filter
Class FallbackFunction
Object
ExpressionAbstract
DefaultExpression
FunctionExpressionImpl
FallbackFunction
- All Implemented Interfaces:
Expression
,Function
,FunctionExpression
,Factory
A placeholder class used to track a function the user requested that is not supported by our java implementation.
This can be used to construct expressions that are to be executed by another systems (say as SQL or as a WFS request).
- Author:
- Jody Garnett
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Field Summary
Fields inherited from class FunctionExpressionImpl
fallback, functionName, name, params
Fields inherited from interface Expression
NIL
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Constructor Summary
ConstructorsConstructorDescriptionFallbackFunction
(String name, List<Expression> params, Literal fallback) FallbackFunction
(Name name, List<Expression> params, Literal fallback) -
Method Summary
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
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Constructor Details
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FallbackFunction
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FallbackFunction
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Method Details
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evaluate
Description copied from class:ExpressionAbstract
Subclass should override, default implementation returns null.- Specified by:
evaluate
in interfaceExpression
- Overrides:
evaluate
in classFunctionExpressionImpl
- Returns:
- default implementation returns null
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evaluate
Description copied from class:ExpressionAbstract
Default implementation delegates handling of context conversion to Converters utility class.Subclasses are expected to make use of the Converters utility class (as the easiest way to provide value morphing in conformance with the Filter specification).
- Specified by:
evaluate
in interfaceExpression
- Overrides:
evaluate
in classExpressionAbstract
- Type Parameters:
T
- The type of the returned object.- Parameters:
object
- The object to evaluate the expression against.context
- The type of the resulting value of the expression.- Returns:
- Evaluates the given expression based on the content of the given object an an instance of
context
.
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