Package 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.

Nested Class Summary

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

Expression.PointerIterator, Expression.ValueIterator

Field Summary

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

Constructors

Constructor	Description
ExtensionFunction(QName functionName, Expression[] args)	Constructs a new ExtensionFunction.

Method Summary

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()	Gets the function name
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

Constructor Details

ExtensionFunction

public ExtensionFunction(QName functionName,
 Expression[] args)

Constructs a new ExtensionFunction.

Parameters:

functionName - name of the function

args - Expression[] of function args

Method Details

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 class Expression

Parameters:

context - evaluation context

Returns:

Object

computeContextDependent

public boolean computeContextDependent()

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

Overrides:

computeContextDependent in class Operation

Returns:

true

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 class Expression

Parameters:

context - evaluation context

Returns:

Object

getFunctionName

public QName getFunctionName()

Gets the function name

Returns:

QName

toString

public String toString()

Overrides:

toString in class Object