Package com.saxonica.ee.stream.adjunct

Class FilteringAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.TransmissionAdjunct

com.saxonica.ee.stream.adjunct.FilteringAdjunct

All Implemented Interfaces:

FeedMaker

Direct Known Subclasses:

FilterExpressionAdjunct, FilterFnStreamer, FirstItemExpressionAdjunct, OutermostStreamer, RemoveStreamer, SubscriptExpressionAdjunct, SubsequenceStreamer, TailExpressionAdjunct

public abstract class FilteringAdjunct
extends TransmissionAdjunct
implements FeedMaker

A subclass of StreamingAdjunct used for expressions that have a sequence-valued operand with usage transmission. Such expressions may appear as a filter for striding or crawling nodes, in which case they need to filter (or in some cases augment) the event stream rather than operating at the level of composed items.

Constructor Summary

Constructors

Constructor	Description
FilteringAdjunct()

Method Summary

Modifier and Type	Method	Description
abstract FilteringFeed.Filter	makeFilter(XPathContext context, ItemFeed out)	Make a filter for the event stream
ItemFeed	makeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context)

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

getWatchMaker, makeTransmissionFlow

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

FilteringAdjunct

public FilteringAdjunct()

Method Details

makeFilter

public abstract FilteringFeed.Filter makeFilter(XPathContext context,
 ItemFeed out)
                                         throws XPathException

Make a filter for the event stream

Parameters:

context - the XPath dynamic context

out - the destination for the filtered events

Returns:

a filter that can be added to the event stream

Throws:

XPathException - if a dynamic evaluation error occurs

makeItemFeed

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

Specified by:

makeItemFeed in interface FeedMaker

Throws:

XPathException