com.saxonica.ee.stream.adjunct

Class MergeInstrAdjunct

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.MergeInstrAdjunct

public class MergeInstrAdjunct
extends StreamingAdjunct

Streaming adjunct for the xsl:merge instruction. This is rather different from the usual run of streaming adjuncts since it is more concerned with initiating streaming than with the actual processing

Constructor Summary

Constructors

Constructor and Description
MergeInstrAdjunct()

Method Summary

Methods

Modifier and Type	Method and Description
static void	checkStreamability(MergeInstr.MergeSource mergeSource, Configuration config)
PostureAndSweep	computeStreamability(boolean allowExtensions, ContextItemStaticInfo contextInfo, List<String> reasons) Compute the posture and sweep of this expression as defined in the W3C streamability specifications.

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

MergeInstrAdjunct

public MergeInstrAdjunct()

Method Detail

checkStreamability

public static void checkStreamability(MergeInstr.MergeSource mergeSource,
                      Configuration config)
                               throws XPathException

Throws:

XPathException

computeStreamability

public PostureAndSweep computeStreamability(boolean allowExtensions,
                                   ContextItemStaticInfo 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:

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

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