org.apache.xalan.extensions
Interface ExpressionContext

All Known Implementing Classes:
XPathContext.XPathExpressionContext

public interface ExpressionContext

An object that implements this interface can supply information about the current XPath expression context.


Method Summary
 Node getContextNode()
          Get the current context node.
 NodeIterator getContextNodes()
          Get the current context node list.
 ErrorListener getErrorListener()
          Get the error listener.
 XObject getVariableOrParam(QName qname)
          Get a variable based on it's qualified name.
 XPathContext getXPathContext()
          Get the XPathContext that owns this ExpressionContext.
 double toNumber(Node n)
          Get the value of a node as a number.
 java.lang.String toString(Node n)
          Get the value of a node as a string.
 

Method Detail

getContextNode

public Node getContextNode()
Get the current context node.
Returns:
The current context node.

getContextNodes

public NodeIterator getContextNodes()
Get the current context node list.
Returns:
An iterator for the current context list, as defined in XSLT.

getErrorListener

public ErrorListener getErrorListener()
Get the error listener.
Returns:
The registered error listener.

toNumber

public double toNumber(Node n)
Get the value of a node as a number.
Parameters:
n - Node to be converted to a number. May be null.
Returns:
value of n as a number.

toString

public java.lang.String toString(Node n)
Get the value of a node as a string.
Parameters:
n - Node to be converted to a string. May be null.
Returns:
value of n as a string, or an empty string if n is null.

getVariableOrParam

public XObject getVariableOrParam(QName qname)
                           throws TransformerException
Get a variable based on it's qualified name.
Parameters:
qname - The qualified name of the variable.
Returns:
The evaluated value of the variable.
Throws:
TransformerException -  

getXPathContext

public XPathContext getXPathContext()
                             throws TransformerException
Get the XPathContext that owns this ExpressionContext. Note: exslt:function requires the XPathContext to access the variable stack and TransformerImpl.
Returns:
The current XPathContext.
Throws:
TransformerException -  


Copyright 2006 Apache XML Project. All Rights Reserved.