Package com.saxonica.ee.stream.adjunct

Class SubscriptExpressionAdjunct

java.lang.Object
com.saxonica.ee.stream.adjunct.StreamingAdjunct
com.saxonica.ee.stream.adjunct.TransmissionAdjunct
com.saxonica.ee.stream.adjunct.FilteringAdjunct
com.saxonica.ee.stream.adjunct.SubscriptExpressionAdjunct
All Implemented Interfaces:
FeedMaker
public class SubscriptExpressionAdjunct extends FilteringAdjunct implements FeedMaker
Streaming code for a subscript expression

  • Constructor Details

    • SubscriptExpressionAdjunct

      public SubscriptExpressionAdjunct()

  • Method Details

    • getFeedMaker

      public FeedMaker getFeedMaker(int arg) throws XPathException
      Description copied from class: StreamingAdjunct
      Get a FeedMaker, a factory class that creates a Feed to evaluate this expression in streaming mode. In many cases the StreamingAdjunct is itself a FeedMaker, in which case it returns itself. But where an expression has several operands, it will typically create different feeds depending on which argument is the streamed input, and in such cases the individual StreamingAdjunct makes the decision which feed to use, by returning an appropriate FeedMaker.
      Overrides:
      getFeedMaker in class StreamingAdjunct
      Parameters:
      arg - identifies the argument with respect to which the expression is to be inverted: usually 0 to indicate the first argument is the value that is streamed. Argument numbering is the same as the sequence of arguments/operands returned by the method Expression.operands()
      Returns:
      a FeedMaker 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

    • makeFilter

      public FilteringFeed.Filter makeFilter(XPathContext context, ItemFeed out) throws XPathException
      Description copied from class: FilteringAdjunct
      Make a filter for the event stream
      Specified by:
      makeFilter in class FilteringAdjunct
      Parameters:
      context - the XPath dynamic context
      out - the destination for the filtered events
      Returns:
      a filter that can be added to the event stream
      Throws:
      XPathException - if a dynamic evaluation error occurs