com.saxonica.ee.stream.adjunct

Class ForExpressionAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.ForExpressionAdjunct

All Implemented Interfaces:

FeedMaker

public class ForExpressionAdjunct
extends StreamingAdjunct
implements FeedMaker

Compiles streaming code to implement a Let expression

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ForExpressionAdjunct.ForExpressionFeed

Constructor Summary

Constructors

Constructor and Description
ForExpressionAdjunct()

Method Summary

Methods

Modifier and Type	Method and Description
PostureAndSweep	computeStreamability(boolean allowExtensions, ContextItemStaticInfo contextInfo, List<String> reasons) Get the "sweep" of this expression as defined in the W3C streamability specifications.
Feed	makeItemFeed(WatchManager watchManager, Feed out, XPathContext context)

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

getConfiguration, getDefaultFeedMaker, getExpression, getFeedMaker, getWatchMaker, setConfiguration, setExpression, toStreamingPattern

Methods inherited from class java.lang.Object

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

Constructor Detail

ForExpressionAdjunct

public ForExpressionAdjunct()

Method Detail

computeStreamability

public PostureAndSweep computeStreamability(boolean allowExtensions,
                                   ContextItemStaticInfo contextInfo,
                                   List<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 StreamingAdjunct

Parameters:

allowExtensions - if false, the definition of "guaranteed streamability" in the W3C specification is used. If true, Saxon extensions are permitted, which make some

contextInfo -

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

Specified by:

makeItemFeed in interface FeedMaker

Throws:

XPathException