com.saxonica.stream.adjunct
Class DistinctValuesAdjunct

java.lang.Object
  com.saxonica.stream.adjunct.StreamingAdjunct
      com.saxonica.stream.adjunct.DistinctValuesAdjunct

public class DistinctValuesAdjunct
extends StreamingAdjunct

Compile a distinct-values expression/instruction to streaming code.

Constructor Summary

DistinctValuesAdjunct()

Method Summary

FeedMaker

getFeedMaker(Expression expression, int arg) Get a FeedMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.

Methods inherited from class com.saxonica.stream.adjunct.StreamingAdjunct

getConfiguration, getWatchMaker, makeStreamingAdjunct, setConfiguration

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DistinctValuesAdjunct

public DistinctValuesAdjunct()

Method Detail

getFeedMaker

public FeedMaker getFeedMaker(Expression expression,
                              int arg)

Description copied from class: StreamingAdjunct

Get a FeedMaker, a factory class that creates a Watch to evaluate this expression in streaming mode.

Overrides:

getFeedMaker in class StreamingAdjunct

Parameters:

expression - the expression to be evaluated in streaming mode

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.iterateSubExpressions()

Returns:

a Watchmaker to evaluate the expression, or null if it is not streamable with respect to the specificed argument.