com.saxonica.stream.adjunct

Class FirstItemExpressionAdjunct

java.lang.Object

com.saxonica.stream.adjunct.StreamingAdjunct

com.saxonica.stream.adjunct.FirstItemExpressionAdjunct

public class FirstItemExpressionAdjunct
extends StreamingAdjunct

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

Constructor Summary

Constructors

Constructor and Description
FirstItemExpressionAdjunct()

Method Summary

Methods

Modifier and Type	Method and Description
FeedMaker	getFeedMaker(Expression expr, int arg) Get a FeedMaker, a factory class that creates a Feed 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

FirstItemExpressionAdjunct

public FirstItemExpressionAdjunct()

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 Feed 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 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