Package com.saxonica.ee.stream.adjunct

Class ComposingAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.ComposingAdjunct

Direct Known Subclasses:

AtomizerAdjunct, CopyOfAdjunct, SnapshotFnStreamer, StringFnStreamer

public abstract class ComposingAdjunct
extends StreamingAdjunct

Watch factory class for an class that composes items from sequences of events: examples are copy-of(), data(), and string().

Constructor Summary

Constructors

Constructor	Description
ComposingAdjunct()

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.
abstract 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

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 Details

ComposingAdjunct

public ComposingAdjunct()

Method Details

makeComposingAction

public abstract 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

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)
                         throws XPathException

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 StreamingAdjunct

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.

Throws:

XPathException - in the event of a failure