org.apache.xpath

Class XPathContext.XPathExpressionContext

java.lang.Object

org.apache.xpath.XPathContext.XPathExpressionContext

All Implemented Interfaces:

ExpressionContext

Enclosing class:

XPathContext

public class XPathContext.XPathExpressionContext
extends Object
implements ExpressionContext

Constructor Summary

Constructors

Constructor and Description
XPathExpressionContext()

Method Summary

Modifier and Type	Method and Description
Node	getContextNode() Get the current context node.
org.w3c.dom.traversal.NodeIterator	getContextNodes() Get the current context node list.
DTMManager	getDTMManager() Return the DTMManager object.
ErrorListener	getErrorListener() Get the error listener.
XObject	getVariableOrParam(QName qname) Get a variable based on it's qualified name.
XPathContext	getXPathContext() Return the XPathContext associated with this XPathExpressionContext.
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.

Methods inherited from class java.lang.Object

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

Constructor Detail

XPathExpressionContext

public XPathExpressionContext()

Method Detail

getXPathContext

public XPathContext getXPathContext()

Return the XPathContext associated with this XPathExpressionContext. Extensions should use this judiciously and only when special processing requirements cannot be met another way. Consider requesting an enhancement to the ExpressionContext interface to avoid having to call this method.

Specified by:

getXPathContext in interface ExpressionContext

Returns:

the XPathContext associated with this XPathExpressionContext.

getDTMManager

public DTMManager getDTMManager()

Return the DTMManager object. Though XPathContext context extends the DTMManager, it really is a proxy for the real DTMManager. If a caller needs to make a lot of calls to the DTMManager, it is faster if it gets the real one from this function.

getContextNode

public Node getContextNode()

Get the current context node.

Specified by:

getContextNode in interface ExpressionContext

Returns:

The current context node.

getContextNodes

public org.w3c.dom.traversal.NodeIterator getContextNodes()

Get the current context node list.

Specified by:

getContextNodes in interface ExpressionContext

Returns:

An iterator for the current context list, as defined in XSLT.

getErrorListener

public ErrorListener getErrorListener()

Get the error listener.

Specified by:

getErrorListener in interface ExpressionContext

Returns:

The registered error listener.

toNumber

public double toNumber(Node n)

Get the value of a node as a number.

Specified by:

toNumber in interface ExpressionContext

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.

Specified by:

toString in interface ExpressionContext

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 final XObject getVariableOrParam(QName qname)
                                 throws TransformerException

Get a variable based on it's qualified name.

Specified by:

getVariableOrParam in interface ExpressionContext

Parameters:

qname - The qualified name of the variable.

Returns:

The evaluated value of the variable.

Throws:

TransformerException