org.apache.xalan.extensions
Class ExpressionVisitor

java.lang.Object
  |
  +--org.apache.xpath.XPathVisitor
        |
        +--org.apache.xalan.extensions.ExpressionVisitor

public class ExpressionVisitor

extends XPathVisitor

When org.apache.xalan.templates.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

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

Method Summary

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

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

Constructor Detail

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 Detail

visitFunction

public boolean visitFunction(ExpressionOwner owner,
                             Function func)

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

Parameters:

owner - The current XPath object that owns the expression.

function - The function currently being visited.

Returns:

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

Overrides:

visitFunction in class XPathVisitor