Package com.saxonica.ee.stream.adjunct

Class CardinalityCheckerAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.TransmissionAdjunct

com.saxonica.ee.stream.adjunct.CardinalityCheckerAdjunct

All Implemented Interfaces:

FeedMaker

public class CardinalityCheckerAdjunct
extends TransmissionAdjunct
implements FeedMaker

Generate streaming code for a cardinality checker

Constructor Summary

Constructors

Constructor	Description
CardinalityCheckerAdjunct()

Method Summary

Modifier and Type	Method	Description
PostureAndSweep	computeStreamability(ContextItemStaticInfoEE contextInfo, java.util.List<java.lang.String> reasons)	Get the sweep and posture of this expression as defined in the W3C streamability specifications.
WatchMaker	getWatchMaker(boolean forGrouping)	Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.
ItemFeed	makeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context)

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

makeTransmissionFlow

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

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

CardinalityCheckerAdjunct

public CardinalityCheckerAdjunct()

Method Detail

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 TransmissionAdjunct

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

computeStreamability

public PostureAndSweep computeStreamability(ContextItemStaticInfoEE contextInfo,
                                            java.util.List<java.lang.String> reasons)

Get the sweep and posture of this expression as defined in the W3C streamability specifications. This provides an assessment of stylesheet code against the W3C criteria for guaranteed streamability, and is implemented to allow these criteria to be tested. It is not the case that all expression that emerge as streamable from this analysis are currently capable of being streamed by Saxon

Overrides:

computeStreamability in class StreamingAdjunct

Parameters:

contextInfo - static information about the context item

reasons - the caller may supply a list, in which case the implementation may add to this

Returns:

the posture and sweep of the expression

makeItemFeed

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

Specified by:

makeItemFeed in interface FeedMaker

Throws:

XPathException