Package org.geotools.filter.expression
Class ExpressionAbstract
- Object
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- ExpressionAbstract
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- All Implemented Interfaces:
Expression
- Direct Known Subclasses:
DefaultExpression
,FunctionImpl
public abstract class ExpressionAbstract extends Object implements Expression
Abstract superclass of these Expression implementations.- Author:
- Jody Garnett
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Field Summary
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Fields inherited from interface Expression
NIL
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Constructor Summary
Constructors Constructor Description ExpressionAbstract()
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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 Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface Expression
accept
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Method Detail
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evaluate
public Object evaluate(Object object)
Subclass should override, default implementation returns null.- Specified by:
evaluate
in interfaceExpression
- Returns:
- default implementation returns null
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evaluate
public <T> T evaluate(Object object, Class<T> context)
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
- 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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