com.saxonica.ee.stream.adjunct

Class ForEachGroupAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.TransmissionAdjunct

com.saxonica.ee.stream.adjunct.ForEachAdjunct

com.saxonica.ee.stream.adjunct.ForEachGroupAdjunct

All Implemented Interfaces:

FeedMaker

public class ForEachGroupAdjunct
extends ForEachAdjunct

Compile an xsl:for-each-group instruction to streaming code.

Constructor Summary

Constructors

Constructor and Description
ForEachGroupAdjunct()

Method Summary

Modifier and Type	Method and Description
PostureAndSweep	computeStreamability(ContextItemStaticInfoEE contextInfo, java.util.List<java.lang.String> reasons) Get the "sweep" 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.
static GroupBoundaryTester	makeBoundaryTester(ForEachGroup instruction, XPathContext populationContext)
Feed	makeItemFeed(WatchManager watchManager, Feed out, XPathContext context)

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

getActionInversion, getStreamability, toStreamingPattern

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

makeTransmissionFlow

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

findConsumingArg, getConfiguration, getDefaultFeedMaker, getExpression, getFeedMaker, makeStreamingAdjunct, setConfiguration, setExpression

Methods inherited from class java.lang.Object

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

Constructor Detail

ForEachGroupAdjunct

public ForEachGroupAdjunct()

Method Detail

computeStreamability

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

Get the "sweep" 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 ForEachAdjunct

Parameters:

contextInfo - whatever is known statically about the context item

reasons - return parameter to hold reasons for non-streamability @return the posture and sweep

Returns:

the posture and sweep of the expression

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 ForEachAdjunct

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

makeItemFeed

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

Specified by:

makeItemFeed in interface FeedMaker

Overrides:

makeItemFeed in class ForEachAdjunct

Throws:

XPathException

makeBoundaryTester

public static GroupBoundaryTester makeBoundaryTester(ForEachGroup instruction,
                                                     XPathContext populationContext)