org.apache.commons.jxpath.ri.compiler
Class ExtensionFunction

java.lang.Object
  org.apache.commons.jxpath.ri.compiler.Expression
      org.apache.commons.jxpath.ri.compiler.Operation
          org.apache.commons.jxpath.ri.compiler.ExtensionFunction

public class ExtensionFunction

extends Operation

Represents an element of the parse tree representing an extension function call.

Version:

$Revision: 1.13 $ $Date: 2004/03/25 05:42:01 $

Author:

Dmitri Plotnikov

Nested Class Summary

Nested classes inherited from class org.apache.commons.jxpath.ri.compiler.Expression

Expression.PointerIterator, Expression.ValueIterator

Field Summary

private QName

functionName

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Operation

args

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression

NOT_A_NUMBER, ONE, ZERO

Constructor Summary

ExtensionFunction(QName functionName, Expression[] args)

Method Summary

java.lang.Object	compute(EvalContext context)
boolean	computeContextDependent() An extension function gets the current context, therefore it MAY be context dependent.
java.lang.Object	computeValue(EvalContext context) Evaluates the expression.
private java.lang.Object	convert(java.lang.Object object)
QName	getFunctionName()
java.lang.String	toString()

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Operation

getArguments

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression

isContextDependent, iterate, iteratePointers

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

functionName

private QName functionName

Constructor Detail

ExtensionFunction

public ExtensionFunction(QName functionName,
                         Expression[] args)

Method Detail

getFunctionName

public QName getFunctionName()

computeContextDependent

public boolean computeContextDependent()

An extension function gets the current context, therefore it MAY be context dependent.

Overrides:

computeContextDependent in class Operation

toString

public java.lang.String toString()

compute

public java.lang.Object compute(EvalContext context)

Specified by:

compute in class Expression

computeValue

public java.lang.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 class Expression

convert

private java.lang.Object convert(java.lang.Object object)