Package com.saxonica.ee.stream.adjunct
Class TransmissionAdjunct
java.lang.Object
com.saxonica.ee.stream.adjunct.StreamingAdjunct
com.saxonica.ee.stream.adjunct.TransmissionAdjunct
- All Implemented Interfaces:
FeedMaker
- Direct Known Subclasses:
AbsorbingFunctionCallAdjunct
,AdjacentTextNodeMergerAdjunct
,ArrayBlockAdjunct
,BlockAdjunct
,CardinalityCheckerAdjunct
,ChooseAdjunct
,ConditionalBlockAdjunct
,CurrentMergeGroupStreamer
,DeepDescentFunctionCallAdjunct
,DocumentSorterAdjunct
,FilterFunctionCallAdjunct
,FilteringAdjunct
,ForEachAdjunct
,InsertBeforeStreamer
,ItemCheckerAdjunct
,IterateAdjunct
,LetExpressionAdjunctB
,OnEmptyAdjunct
,OnNonEmptyAdjunct
,ShallowDescentFunctionCallAdjunct
,SwitchAdjunct
,TraceExprAdjunct
,TraceStreamer
,TreatFnStreamer
,TryCatchAdjunct
,VennExpressionAdjunct
,WherePopulatedAdjunct
A subclass of StreamingAdjunct used for expressions that have a sequence-valued operand with usage
transmission. Such expressions may appear as a filter for striding or crawling nodes, in which case
they need to filter (or in some cases augment) the event stream rather than operating at the level of
composed items.
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptiongetWatchMaker
(boolean forGrouping) Get a WatchMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.makeTransmissionFlow
(WatchManager watchManager, Expression exp, ItemFeed out, XPathContext context) Make a Trigger that implements this expression in streaming mode.Methods inherited from class com.saxonica.ee.stream.adjunct.StreamingAdjunct
computeStreamability, 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
Methods inherited from interface com.saxonica.ee.stream.feed.FeedMaker
makeItemFeed
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Constructor Details
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TransmissionAdjunct
public TransmissionAdjunct()
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Method Details
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getWatchMaker
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 valueExpression.WATCH_METHOD
- Overrides:
getWatchMaker
in classStreamingAdjunct
- 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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makeTransmissionFlow
public Trigger makeTransmissionFlow(WatchManager watchManager, Expression exp, ItemFeed out, XPathContext context) throws XPathException Make a Trigger that implements this expression in streaming mode. This method is used for an expression that is striding or crawling, and it delivers a Trigger connected to a sequence of Feeds which together have the effect of delivering a sequence of events and/or items that together represent the results of this instruction. This method MUST be implemented for every expression that has an operand whose usage is transmission (and for every such operand).- Parameters:
watchManager
- the WatchManager that fires this triggerexp
- the expressionout
- the next action in the push pipeline for evaluationcontext
- the XPath dynamic context- Returns:
- the Trigger (a Watch with a pattern)
- Throws:
XPathException
- if a dynamic evaluation error occurs.
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