CurrentGroupStreamer

java.lang.Object

com.saxonica.ee.stream.adjunct.StreamingAdjunct

com.saxonica.ee.stream.adjunct.CurrentGroupStreamer

public class CurrentGroupStreamer extends StreamingAdjunct

Provides streaming code for a call on current-group().

Constructor Summary

Constructors

Constructor

Description

CurrentGroupStreamer()
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.

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)

Methods inherited from class com.saxonica.ee.stream.adjunct.StreamingAdjunct
emptyAdjunctMap, findConsumingArg, genId, getConfiguration, getDefaultFeedMaker, getExpression, getFeedMaker, getWatchMaker, makeStreamingAdjunct, setConfiguration, setExpression

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- CurrentGroupStreamer
  
  public CurrentGroupStreamer()
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
- 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:
  
  toStreamingPattern in class StreamingAdjunct
  
  Parameters:
  
  config - the Saxon configuration
  
  Returns:
  
  the equivalent pattern if conversion succeeds; otherwise null