Package org.geotools.filter
Class FallbackFunction
- Object
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- ExpressionAbstract
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- DefaultExpression
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- FunctionExpressionImpl
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- FallbackFunction
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- All Implemented Interfaces:
Expression
,Function
,FunctionExpression
,Factory
public class FallbackFunction extends FunctionExpressionImpl
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
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Fields inherited from class FunctionExpressionImpl
fallback, functionName, name, params
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Fields inherited from interface Expression
NIL
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Constructor Summary
Constructors Constructor Description FallbackFunction(String name, List<Expression> params, Literal fallback)
FallbackFunction(Name name, List<Expression> params, Literal fallback)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
evaluate(Object object)
Subclass should override, default implementation returns null.<T> T
evaluate(Object object, Class<T> context)
Default implementation delegates handling of context conversion to Converters utility class.-
Methods inherited from class FunctionExpressionImpl
accept, equals, functionName, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, hashCode, setFallbackValue, setParameters, toString
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Methods inherited from class DefaultExpression
isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression
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Constructor Detail
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FallbackFunction
public FallbackFunction(String name, List<Expression> params, Literal fallback)
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FallbackFunction
public FallbackFunction(Name name, List<Expression> params, Literal fallback)
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Method Detail
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evaluate
public Object evaluate(Object object)
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
public <T> T evaluate(Object object, Class<T> context)
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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