Class ExtensionFunction
- java.lang.Object
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- org.apache.commons.jxpath.ri.compiler.Expression
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- org.apache.commons.jxpath.ri.compiler.Operation
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- org.apache.commons.jxpath.ri.compiler.ExtensionFunction
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public class ExtensionFunction extends Operation
Represents an element of the parse tree representing an extension function call.- Version:
- $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
- Author:
- Dmitri Plotnikov
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.commons.jxpath.ri.compiler.Expression
Expression.PointerIterator, Expression.ValueIterator
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Field Summary
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Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression
NOT_A_NUMBER, ONE, ZERO
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Constructor Summary
Constructors Constructor Description ExtensionFunction(QName functionName, Expression[] args)
Create a new ExtensionFunction.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
compute(EvalContext context)
Evaluates the expression.boolean
computeContextDependent()
An extension function gets the current context, therefore it MAY be context dependent.Object
computeValue(EvalContext context)
Evaluates the expression.QName
getFunctionName()
Get the function nameString
toString()
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Methods inherited from class org.apache.commons.jxpath.ri.compiler.Operation
getArguments
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Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression
isContextDependent, iterate, iteratePointers
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Constructor Detail
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ExtensionFunction
public ExtensionFunction(QName functionName, Expression[] args)
Create a new ExtensionFunction.- Parameters:
functionName
- name of the functionargs
- Expression[] of function args
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Method Detail
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getFunctionName
public QName getFunctionName()
Get the function name- Returns:
- QName
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computeContextDependent
public boolean computeContextDependent()
An extension function gets the current context, therefore it MAY be context dependent.- Overrides:
computeContextDependent
in classOperation
- Returns:
- true
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compute
public Object compute(EvalContext context)
Description copied from class:Expression
Evaluates the expression. If the result is a node set, returns the first element of the node set.- Specified by:
compute
in classExpression
- Parameters:
context
- evaluation context- Returns:
- Object
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computeValue
public Object computeValue(EvalContext context)
Description copied from class:Expression
Evaluates the expression. If the result is a node set, returns the first element of the node set.- Specified by:
computeValue
in classExpression
- Parameters:
context
- evaluation context- Returns:
- Object
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