Package com.saxonica.ee.stream.watch

Class ForEachAction

java.lang.Object

net.sf.saxon.event.Outputter

net.sf.saxon.event.ProxyOutputter

com.saxonica.ee.stream.feed.ItemFeed

com.saxonica.ee.stream.watch.ForEachAction

All Implemented Interfaces:

javax.xml.transform.Result, Receiver

Direct Known Subclasses:

ForEachGroupParallelAction, IterateAction

public class ForEachAction
extends ItemFeed

This watch implements xsl:for-each in streaming mode. It is informed of the nodes or other items selected by the xsl:for-each instruction; when such an item is encountered, it locates the relevant (inverted) action representing the body of the for-each, and activates it.

Field Summary

Fields

Modifier and Type	Field	Description
protected PullEvaluator	actionPuller
protected XPathContext	bodyContext
protected WatchManager	watchManager

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

pipelineConfiguration, systemId

Fields inherited from interface javax.xml.transform.Result

PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING

Constructor Summary

Constructors

Constructor	Description
ForEachAction(WatchManager watchManager, Expression expression, ItemFeed result, XPathContext context)

Method Summary

Modifier and Type	Method	Description
void	append(Item it)	Method called by the feed for a subexpression to supply a grounded item from the streamed input.
void	close()	Finish evaluating the expression.
void	endSelectedParentNode(Location locationId)	Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.
protected Expression	getAction()
protected XPathContext	getBodyContext()
protected Inversion	getInversion()
protected WatchManager	getWatchManager()
protected boolean	isActionConsuming()
protected void	makeBodyContext()
void	open(Terminator terminator)	Start evaluating the expression.
void	setInversion(Inversion inversion)	Set the inversion of the for-each action (the body of the loop)
Receiver	startSelectedParentNode(FleetingParentNode node, Location locationId)	Signal that an element has been found that matches the selection that this Watch is looking for.

Methods inherited from class com.saxonica.ee.stream.feed.ItemFeed

append, dynamicError, getContext, getExpression, getResultFeed, getTerminator, hasFailed, processItems, setExpression, setHasFailed, setTerminator

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

attribute, characters, comment, endDocument, endElement, getNextOutputter, namespace, open, processingInstruction, setUnparsedEntity, startContent, startDocument, startElement, startElement, usesTypeAnnotations

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

getConfiguration, getPipelineConfiguration, getStringReceiver, getSystemId, namespaces, setPipelineConfiguration, setSystemId

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.event.Receiver

handlesAppend

Field Detail

bodyContext

protected XPathContext bodyContext

watchManager

protected final WatchManager watchManager

actionPuller

protected PullEvaluator actionPuller

Constructor Detail

ForEachAction

public ForEachAction(WatchManager watchManager,
                     Expression expression,
                     ItemFeed result,
                     XPathContext context)

Method Detail

setInversion

public void setInversion(Inversion inversion)

Set the inversion of the for-each action (the body of the loop)

Parameters:

inversion - the inverted code implementing the body of the for-each

getInversion

protected Inversion getInversion()

getWatchManager

protected WatchManager getWatchManager()

getAction

protected Expression getAction()

isActionConsuming

protected boolean isActionConsuming()

getBodyContext

protected XPathContext getBodyContext()

open

public void open(Terminator terminator)
          throws XPathException

Description copied from class: ItemFeed

Start evaluating the expression. The default implementation does nothing.

Overrides:

open in class ItemFeed

Parameters:

terminator - used to achieve early exit

Throws:

XPathException - if a dynamic error occurs

makeBodyContext

protected void makeBodyContext()

startSelectedParentNode

public Receiver startSelectedParentNode(FleetingParentNode node,
                                        Location locationId)
                                 throws XPathException

Signal that an element has been found that matches the selection that this Watch is looking for. This method is called by the WatchManager while processing the startElement event that matches the selection. For this purpose, any attributes selected by the last step in the selection are ignored

Overrides:

startSelectedParentNode in class ItemFeed

Parameters:

node - the element or document node whose start event has been matched

locationId - the location associated with the element or document node (may be the location of the instruction that created it)

Returns:

always null for this method, but may be non-null in subclasses

Throws:

ValidationException - May be raised if the constraint implemented by this Watch is violated @param locationId the location of the node in the source, or of the instruction that created it

XPathException - May be raised if a dynamic error occurs

append

public void append(Item it)
            throws XPathException

Method called by the feed for a subexpression to supply a grounded item from the streamed input.

Specified by:

append in interface Receiver

Specified by:

append in class ItemFeed

Parameters:

it - the grounded item.

Throws:

XPathException - if the operation fails

endSelectedParentNode

public void endSelectedParentNode(Location locationId)
                           throws XPathException

Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.

Overrides:

endSelectedParentNode in class ItemFeed

Parameters:

locationId - the location of the node in the source, or of the instruction that created it

Throws:

ValidationException - May be raised if the constraint implemented by this Watch is violated @param locationId the location of the node in the source, or of the instruction that created it

XPathException - May be raised if a constraint implemented by this Watch is violated

close

public void close()
           throws XPathException

Description copied from class: ItemFeed

Finish evaluating the expression.

Specified by:

close in interface Receiver

Overrides:

close in class ItemFeed

Throws:

XPathException - if a dynamic error occurs