Class ShallowDescentFunctionCallAdjunct

  • All Implemented Interfaces:
    FeedMaker

    public class ShallowDescentFunctionCallAdjunct
    extends TransmissionAdjunct
    Handle streaming for calls to user-defined functions with streamability="shallow-descent"
    • Constructor Detail

      • ShallowDescentFunctionCallAdjunct

        public ShallowDescentFunctionCallAdjunct()
    • Method Detail

      • computeStreamability

        public PostureAndSweep computeStreamability​(ContextItemStaticInfoEE contextInfo,
                                                    java.util.List<java.lang.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
      • 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 TransmissionAdjunct
        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