Class DistinctValuesStreamer

java.lang.Object
com.saxonica.ee.stream.adjunct.StreamingAdjunct
com.saxonica.ee.stream.adjunct.DistinctValuesStreamer
All Implemented Interfaces:
FeedMaker

public class DistinctValuesStreamer extends StreamingAdjunct implements FeedMaker
Implement the distinct-values function in streaming mode.
  • Constructor Details

    • DistinctValuesStreamer

      public DistinctValuesStreamer()
  • Method Details

    • getFeedMaker

      public FeedMaker getFeedMaker(int arg)
      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.
    • makeItemFeed

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