Package net.sf.saxon.expr.elab

Class MemoClosureEvaluator

java.lang.Object

net.sf.saxon.expr.elab.MemoClosureEvaluator

All Implemented Interfaces:

SequenceEvaluator

public class MemoClosureEvaluator
extends Object
implements SequenceEvaluator

A MemoClosureEvaluator is a SequenceEvaluator that evaluates an expression lazily and incrementally; it evaluates new items in the result as and when they are needed.

Constructor Summary

Constructors

Constructor	Description
MemoClosureEvaluator(Expression input, PullEvaluator inputEvaluator)

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

MemoClosureEvaluator

public MemoClosureEvaluator(Expression input,
 PullEvaluator inputEvaluator)

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.