Class ForEachGroupAdjunct

All Implemented Interfaces:
FeedMaker

public class ForEachGroupAdjunct extends ForEachAdjunct
Compile an xsl:for-each-group instruction to streaming code.
  • Constructor Details

    • ForEachGroupAdjunct

      public ForEachGroupAdjunct()
  • Method Details

    • computeStreamability

      public PostureAndSweep computeStreamability(ContextItemStaticInfoEE 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 ForEachAdjunct
      Parameters:
      contextInfo - whatever is known statically about the context item
      reasons - return parameter to hold reasons for non-streamability @return the posture and sweep
      Returns:
      the posture and sweep of the expression
    • getWatchMaker

      public WatchMaker getWatchMaker(boolean forGrouping) throws XPathException
      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 value Expression.WATCH_METHOD
      Overrides:
      getWatchMaker in class ForEachAdjunct
      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
    • makeItemFeed

      public ItemFeed makeItemFeed(WatchManager watchManager, ItemFeed out, XPathContext context) throws XPathException
      Specified by:
      makeItemFeed in interface FeedMaker
      Overrides:
      makeItemFeed in class ForEachAdjunct
      Throws:
      XPathException
    • makeBoundaryTester

      public static GroupBoundaryTester makeBoundaryTester(ForEachGroup instruction, XPathContext populationContext)