net.sf.saxon.event

Class Valve

java.lang.Object

net.sf.saxon.event.SequenceReceiver

net.sf.saxon.event.ProxyReceiver

net.sf.saxon.event.Valve

All Implemented Interfaces:

Result, Receiver

public class Valve
extends ProxyReceiver

A Valve is a general-purpose component for use in a pipeline of receivers. It selects an alternative destination for the pipeline events based on the namespace of the first startElement event. There is a primary destination which is selected initially. If the namespace of the first element has a given value, then subsequent output is sent to an alternative destination.

Field Summary

Fields inherited from class net.sf.saxon.event.ProxyReceiver

nextReceiver

Fields inherited from class net.sf.saxon.event.SequenceReceiver

pipelineConfiguration, previousAtomic, systemId

Fields inherited from interface javax.xml.transform.Result

PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING

Constructor Summary

Constructors

Constructor and Description
Valve(String testNamespace, Receiver primary, Receiver secondary) Create a Valve.

Method Summary

Modifier and Type	Method and Description
void	startElement(NodeName elemName, SchemaType typeCode, Location location, int properties) Notify the start of an element
boolean	wasDiverted() Ask (after the first element event has been received) whether output was diverted to the secondary receiver

Methods inherited from class net.sf.saxon.event.ProxyReceiver

append, attribute, characters, close, comment, endDocument, endElement, getNamePool, getNextReceiver, namespace, open, processingInstruction, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity, startContent, startDocument, usesTypeAnnotations

Methods inherited from class net.sf.saxon.event.SequenceReceiver

append, decompose, flatten, getConfiguration, getErrorCodeForDecomposingFunctionItems, getPipelineConfiguration, getSystemId, handlesAppend

Methods inherited from class java.lang.Object

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

Constructor Detail

Valve

public Valve(String testNamespace,
             Receiver primary,
             Receiver secondary)

Create a Valve. Events sent to this Valve will be forwarded to the primary receiver, unless the namespace of the first element node matches the test namespace, in which case the events will be forwarded to the secondary receiver

Parameters:

testNamespace - the test namespace

primary - the primary Receiver

secondary - the secondary Receiver

Method Detail

startElement

public void startElement(NodeName elemName,
                         SchemaType typeCode,
                         Location location,
                         int properties)
                  throws XPathException

Description copied from class: ProxyReceiver

Notify the start of an element

Specified by:

startElement in interface Receiver

Overrides:

startElement in class ProxyReceiver

Parameters:

elemName - integer code identifying the name of the element within the name pool.

typeCode - the element's type annotation.

location - a location associated with the event (typically either a location in the source document or the stylesheet)

properties - properties of the element node

Throws:

XPathException - if an error occurs

wasDiverted

public boolean wasDiverted()

Ask (after the first element event has been received) whether output was diverted to the secondary receiver

Returns:

true if output was diverted, that is, if the first element node was in the test namespace.