Package com.saxonica.ee.stream.adjunct

Class SnapshotFnStreamer

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.ComposingAdjunct

com.saxonica.ee.stream.adjunct.SnapshotFnStreamer

All Implemented Interfaces:

FeedMaker

public class SnapshotFnStreamer
extends ComposingAdjunct
implements FeedMaker

Generate streaming code for the snapshot() function

Constructor Summary

Constructors

Constructor	Description
SnapshotFnStreamer()

Method Summary

Modifier and Type	Method	Description
WatchMaker	getWatchMaker(boolean forGrouping)	Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.
ItemFeed	makeComposingAction(WatchManager watchManager, ItemFeed out, XPathContext context)	Method that must be implemented in subclasses to supply the feed to which the composed items are sent
ItemFeed	makeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context)

Methods inherited from class com.saxonica.ee.stream.adjunct.StreamingAdjunct

computeStreamability, emptyAdjunctMap, findConsumingArg, genId, getConfiguration, getDefaultFeedMaker, getExpression, getFeedMaker, makeStreamingAdjunct, setConfiguration, setExpression, toStreamingPattern

Methods inherited from class java.lang.Object

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

Constructor Detail

SnapshotFnStreamer

public SnapshotFnStreamer()

Method Detail

makeComposingAction

public ItemFeed makeComposingAction(WatchManager watchManager,
                                    ItemFeed out,
                                    XPathContext context)

Description copied from class: ComposingAdjunct

Method that must be implemented in subclasses to supply the feed to which the composed items are sent

Specified by:

makeComposingAction in class ComposingAdjunct

Parameters:

watchManager - the watch manager

out - the destination of composed items

context - XPath evaluation context

Returns:

a the relevant ItemFeed

getWatchMaker

public WatchMaker getWatchMaker(boolean forGrouping)

Description copied from class: StreamingAdjunct

Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode. This method will only be called if the getImplementationMethod() method of the expression includes the value Expression.WATCH_METHOD

Overrides:

getWatchMaker in class ComposingAdjunct

Parameters:

forGrouping - true if the selected items are being grouped

Returns:

a Watchmaker to evaluate the expression, or null if it is not streamable with respect to the specificed argument.

makeItemFeed

public ItemFeed makeItemFeed(WatchManager watchManager,
                             ItemFeed out,
                             XPathContext context)
                      throws XPathException

Specified by:

makeItemFeed in interface FeedMaker

Throws:

XPathException