Package org.apache.xalan.extensions

Class ExpressionVisitor

java.lang.Object

org.apache.xpath.XPathVisitor

org.apache.xalan.extensions.ExpressionVisitor

public class ExpressionVisitor
extends XPathVisitor

When StylesheetHandler creates an XPath, the ExpressionVisitor visits the XPath expression. For any extension functions it encounters, it instructs StylesheetRoot to register the extension namespace. This mechanism is required to locate extension functions that may be embedded within an expression.

Constructor Summary

Constructors

Constructor	Description
ExpressionVisitor(StylesheetRoot sroot)	The constructor sets the StylesheetRoot variable which is used to register extension namespaces.

Method Summary

Modifier and Type	Method	Description
boolean	visitFunction(ExpressionOwner owner, Function func)	If the function is an extension function, register the namespace.

Methods inherited from class org.apache.xpath.XPathVisitor

visitBinaryOperation, visitLocationPath, visitMatchPattern, visitNumberLiteral, visitPredicate, visitStep, visitStringLiteral, visitUnaryOperation, visitUnionPath, visitUnionPattern, visitVariableRef

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionVisitor

public ExpressionVisitor(StylesheetRoot sroot)

The constructor sets the StylesheetRoot variable which is used to register extension namespaces.

Parameters:

sroot - the StylesheetRoot that is being constructed.

Method Details

visitFunction

public boolean visitFunction(ExpressionOwner owner,
Function func)

If the function is an extension function, register the namespace.

Overrides:

visitFunction in class XPathVisitor

Parameters:

owner - The current XPath object that owns the expression.

func - The function currently being visited.

Returns:

true to continue the visit in the subtree, if any.