Package com.saxonica.ee.stream.adjunct
Class ForEachAdjunct
- java.lang.Object
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- com.saxonica.ee.stream.adjunct.StreamingAdjunct
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- com.saxonica.ee.stream.adjunct.TransmissionAdjunct
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- com.saxonica.ee.stream.adjunct.ForEachAdjunct
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- All Implemented Interfaces:
FeedMaker
- Direct Known Subclasses:
ForEachGroupAdjunct
public class ForEachAdjunct extends TransmissionAdjunct implements FeedMaker
Compile an xsl:for-each instruction to streaming code. Also handles a path expression (SlashExpression).
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Constructor Summary
Constructors Constructor Description ForEachAdjunct()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description PostureAndSweepcomputeStreamability(ContextItemStaticInfoEE contextInfo, java.util.List<java.lang.String> reasons)Compute the posture and sweep of this expression as defined in the W3C streamability specifications.protected InversiongetActionInversion(boolean forGrouping)static PostureAndSweepgetStreamability(ContextSwitchingExpression expression, ContextItemStaticInfoEE contextInfo, java.util.List<java.lang.String> reasons)WatchMakergetWatchMaker(boolean forGrouping)Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.ItemFeedmakeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context)voidsetExpression(Expression expression)Set the expression being processed by this StreamingAdjunctPatterntoStreamingPattern(Configuration config)Convert this expression to a streaming pattern (a pattern used internally to match nodes during push processing of an event stream)-
Methods inherited from class com.saxonica.ee.stream.adjunct.TransmissionAdjunct
makeTransmissionFlow
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Methods inherited from class com.saxonica.ee.stream.adjunct.StreamingAdjunct
findConsumingArg, getConfiguration, getDefaultFeedMaker, getExpression, getFeedMaker, makeStreamingAdjunct, setConfiguration
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Method Detail
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setExpression
public void setExpression(Expression expression)
Set the expression being processed by this StreamingAdjunct- Overrides:
setExpressionin classStreamingAdjunct- Parameters:
expression- the expression being processed
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toStreamingPattern
public Pattern toStreamingPattern(Configuration config)
Convert this expression to a streaming pattern (a pattern used internally to match nodes during push processing of an event stream)- Overrides:
toStreamingPatternin classStreamingAdjunct- Parameters:
config- the Saxon configuration- Returns:
- the equivalent pattern if conversion succeeds; otherwise null
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getActionInversion
protected Inversion getActionInversion(boolean forGrouping) throws XPathException
- Throws:
XPathException
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getWatchMaker
public WatchMaker getWatchMaker(boolean forGrouping) throws XPathException
Description copied from class:StreamingAdjunctGet 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 valueExpression.WATCH_METHOD- Overrides:
getWatchMakerin classTransmissionAdjunct- 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
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makeItemFeed
public ItemFeed makeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context) throws XPathException
- Specified by:
makeItemFeedin interfaceFeedMaker- Throws:
XPathException
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computeStreamability
public PostureAndSweep computeStreamability(ContextItemStaticInfoEE contextInfo, java.util.List<java.lang.String> reasons)
Description copied from class:StreamingAdjunctCompute 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:
computeStreamabilityin classStreamingAdjunct- Parameters:
contextInfo- Information about the context item type and posturereasons- 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
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getStreamability
public static PostureAndSweep getStreamability(ContextSwitchingExpression expression, ContextItemStaticInfoEE contextInfo, java.util.List<java.lang.String> reasons)
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