Package com.saxonica.ee.stream.feed

Class SnapshotFeed

java.lang.Object

net.sf.saxon.event.Outputter

net.sf.saxon.event.ProxyOutputter

com.saxonica.ee.stream.feed.ItemFeed

com.saxonica.ee.stream.feed.GroundedItemFeed

com.saxonica.ee.stream.feed.AbsorptionFeed

com.saxonica.ee.stream.feed.SnapshotFeed

All Implemented Interfaces:

javax.xml.transform.Result, Receiver

public class SnapshotFeed
extends AbsorptionFeed

This class provides streamed implementation of the snapshot() function

Nested Class Summary

Nested classes/interfaces inherited from class com.saxonica.ee.stream.feed.AbsorptionFeed

AbsorptionFeed.PendingItem

Field Summary

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
SnapshotFeed(WatchManager watchManager, ItemFeed result, XPathContext context)

Method Summary

Modifier and Type	Method	Description
static Trigger	getWatch(ItemFeed result, Pattern selection, WatchManager wm, XPathContext context)	Create a Watch whose effect is to create snapshots of the selected (streamed) nodes and pass them to the supplied feed
protected AbsorptionFeed.PendingItem	makePendingItem(int sequenceNr, FleetingParentNode node)	Create a pending item (appropriate to the subclass) containing the data needed to compute the result value for one node in the streamed input sequence
protected Sequence	processGroundedItem(Item item)	Process a grounded item in the input sequence: either a streamed leaf node such as an attribute or text node, or an atomic value, or a non-streamed element or document node injected into the sequence for example by use of the comma operator.

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

append, endSelectedParentNode, setHasFailed, startSelectedParentNode

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

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

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

append, close, dynamicError, getContext, getExpression, getResultFeed, getTerminator, hasFailed, open, processItems, setExpression, setTerminator

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

getNextOutputter, open, 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

Constructor Detail

SnapshotFeed

public SnapshotFeed(WatchManager watchManager,
                    ItemFeed result,
                    XPathContext context)

Method Detail

getWatch

public static Trigger getWatch(ItemFeed result,
                               Pattern selection,
                               WatchManager wm,
                               XPathContext context)

Create a Watch whose effect is to create snapshots of the selected (streamed) nodes and pass them to the supplied feed

Parameters:

result - The feed to which the snapshot nodes should be supplied

selection - defines the nodes to be selected

wm - The WatchManager that will notify the selected nodes

context - the XPath evaluation context

Returns:

the new Watch

makePendingItem

protected AbsorptionFeed.PendingItem makePendingItem(int sequenceNr,
                                                     FleetingParentNode node)
                                              throws XPathException

Description copied from class: AbsorptionFeed

Create a pending item (appropriate to the subclass) containing the data needed to compute the result value for one node in the streamed input sequence

Specified by:

makePendingItem in class AbsorptionFeed

Parameters:

sequenceNr - the sequence number of this node within a set of nested nodes

node - the streamed input node

Returns:

the data needed to process this node

Throws:

XPathException - if a dynamic error is detected at this stage

processGroundedItem

protected Sequence processGroundedItem(Item item)

Description copied from class: AbsorptionFeed

Process a grounded item in the input sequence: either a streamed leaf node such as an attribute or text node, or an atomic value, or a non-streamed element or document node injected into the sequence for example by use of the comma operator.

Specified by:

processGroundedItem in class AbsorptionFeed

Parameters:

item - the grounded item

Returns:

the result of processing the grounded item