Package net.sf.saxon.expr.elab

Class LazyPullEvaluator

java.lang.Object

net.sf.saxon.expr.elab.LazyPullEvaluator

All Implemented Interfaces:

SequenceEvaluator

public class LazyPullEvaluator
extends Object
implements SequenceEvaluator

SequenceEvaluator that evaluates an expression lazily in pull mode; that is, it delivers a LazySequence which defers actual evaluation until the value is actually needed.

Constructor Summary

Constructors

Constructor	Description
LazyPullEvaluator(PullEvaluator select)

Method Summary

Modifier and Type	Method	Description
Sequence	evaluate(XPathContext context)	Evaluate a construct to produce a value (which might be a lazily evaluated Sequence)

Methods inherited from class java.lang.Object

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

Constructor Details

LazyPullEvaluator

public LazyPullEvaluator(PullEvaluator select)

Method Details

evaluate

public Sequence evaluate(XPathContext context)
                  throws XPathException

Evaluate a construct to produce a value (which might be a lazily evaluated Sequence)

Specified by:

evaluate in interface SequenceEvaluator

Parameters:

context - the evaluation context

Returns:

a Sequence (not necessarily grounded)

Throws:

XPathException - if a dynamic error occurs during the evaluation.