com.saxonica.stream.watch

Class EventPushingWatch

java.lang.Object

com.saxonica.validate.AbstractWatch

com.saxonica.stream.watch.EventPushingWatch

All Implemented Interfaces:

Watch

Direct Known Subclasses:

ApplyTemplatesWatch, ForEachWatch, GroupingWatch, IterateWatch

public abstract class EventPushingWatch
extends AbstractWatch

A EvaluatingWatch is a Watch that evaluates an expression based on the nodes encountered in a streamed input document, appending the value of that expression to the Watch for the next expression in the streaming route.

Constructor Summary

Constructors

Constructor and Description
EventPushingWatch(Expression expression, SequenceReceiver result, Stack<XPathContext> contextStack)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() The close() method is called immediately before the Watch is destroyed, that is, when the element whose declaration scopes the constraint implemented by this Watch goes out of scope.
XPathContext	getContext()
Stack<XPathContext>	getContextStack()
Expression	getExpression()
Feed	getParentExpressionFeed()
SequenceReceiver	getResult()
void	open() Open the watch.
void	setParentExpressionFeed(Feed feed) Set a feed to be notified when this watch is opened and closed.

Methods inherited from class com.saxonica.validate.AbstractWatch

getAnchorNode, getNamespaceResolver, getPipelineConfiguration, getSelection, notifySelectedLeafNode, setAnchorNode, setNamespaceResolver, setPipelineConfiguration, setSelection

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.saxonica.stream.watch.Watch

endSelectedParentNode, startSelectedParentNode

Constructor Detail

EventPushingWatch

public EventPushingWatch(Expression expression,
                 SequenceReceiver result,
                 Stack<XPathContext> contextStack)

Method Detail

getResult

public SequenceReceiver getResult()

getExpression

public Expression getExpression()

getContext

public XPathContext getContext()

getContextStack

public Stack<XPathContext> getContextStack()

setParentExpressionFeed

public void setParentExpressionFeed(Feed feed)

Set a feed to be notified when this watch is opened and closed. Typically this feed is a ComplexNodeEventFeed, which is responsible for outputting events representing the start and end of constructed elements produced by a parent expression.

Parameters:

feed - the feed to be notified when this Watch is opened or closed.

getParentExpressionFeed

public Feed getParentExpressionFeed()

open

public void open()
          throws XPathException

Description copied from class: AbstractWatch

Open the watch. This is done at the point where it first starts watching for nodes that match the selection.

Specified by:

open in interface Watch

Overrides:

open in class AbstractWatch

Throws:

XPathException

close

public void close()
           throws XPathException

Description copied from class: AbstractWatch

The close() method is called immediately before the Watch is destroyed, that is, when the element whose declaration scopes the constraint implemented by this Watch goes out of scope. The default implementation does nothing.

Specified by:

close in interface Watch

Overrides:

close in class AbstractWatch

Throws:

XPathException