org.apache.xalan.extensions

Interface ExpressionContext

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.
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.

getVariableOrParam

public XObject getVariableOrParam(QName qname)

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: javax.xml.transform.TransformerException

getXPathContext

public XPathContext getXPathContext()

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: javax.xml.transform.TransformerException

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 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.