Package com.saxonica.ee.stream.adjunct

Class CoercerAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.ComposingAdjunct

com.saxonica.ee.stream.adjunct.CoercerAdjunct

All Implemented Interfaces:

FeedMaker

public class CoercerAdjunct
extends ComposingAdjunct
implements FeedMaker

Streaming adjunct class for a coercer() (which implements the coercion rules)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CoercerAdjunct.CoercingItemFeed

Constructor Summary

Constructors

Constructor	Description
CoercerAdjunct()

Method Summary

Modifier and Type	Method	Description
PostureAndSweep	computeStreamability(ContextItemStaticInfoEE contextInfo, List<String> reasons)	Compute the posture and 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.
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

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

CoercerAdjunct

public CoercerAdjunct()

Method Details

computeStreamability

public PostureAndSweep computeStreamability(ContextItemStaticInfoEE contextInfo,
 List<String> reasons)

Description copied from class: StreamingAdjunct

Compute the posture and sweep of this expression as defined in the W3C streamability specifications. This must be implemented in all subclasses that don't use the general streamability rules. The implementation should have the side-effect of computing the streamability of all subexpressions, recursively.

Overrides:

computeStreamability in class StreamingAdjunct

Parameters:

contextInfo - Information about the context item type and posture

reasons - the caller may supply a list, in which case the implementation may add to this; the contents are human-readable messages explaining why the expression is not streamable.

Returns:

the posture and sweep of the expression

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 - the XPath evaluation context

Returns:

the relevant ItemFeed

makeItemFeed

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

Specified by:

makeItemFeed in interface FeedMaker

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 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.

Throws:

XPathException - in the event of a failure