com.saxonica.stream.adjunct
Class FilterExpressionAdjunct

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

public class FilterExpressionAdjunct
extends StreamingAdjunct

Generate streaming code for a filter expression (when not part of a Watch).

Constructor Summary

FilterExpressionAdjunct()

Method Summary

FeedMaker

getFeedMaker(Expression expr, 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

FilterExpressionAdjunct

public FilterExpressionAdjunct()

Method Detail

getFeedMaker

public FeedMaker getFeedMaker(Expression expr,
                              int arg)
                       throws XPathException

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:

expr - 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.

Throws:

XPathException