Package net.sf.saxon.expr.instruct

Class Block.BlockElaborator

java.lang.Object

net.sf.saxon.expr.elab.Elaborator

net.sf.saxon.expr.elab.PullElaborator

net.sf.saxon.expr.instruct.Block.BlockElaborator

Enclosing class:

Block

public static class Block.BlockElaborator
extends PullElaborator

Elaborator for a "Block", which is typically either an XPath sequence expression (a, b, c) or an XSLT sequence constructor

Constructor Summary

Constructors

Constructor	Description
BlockElaborator()

Method Summary

Modifier and Type	Method	Description
PullEvaluator	elaborateForPull()	Get a function that evaluates the underlying expression in the form of a SequenceIterator
PushEvaluator	elaborateForPush()	Get a function that evaluates the underlying expression in push mode, by writing events to an Outputter
UpdateEvaluator	elaborateForUpdate()
SequenceEvaluator	lazily(boolean repeatable, boolean lazyEvaluationRequired)	Get a function that evaluates the underlying expression lazily

Methods inherited from class net.sf.saxon.expr.elab.PullElaborator

eagerly, elaborateForBoolean, elaborateForItem, elaborateForUnicodeString

Methods inherited from class net.sf.saxon.expr.elab.Elaborator

elaborateForString, getConfiguration, getExpression, handleNullString, handleNullUnicodeString, handlePossiblyNullString, handlePossiblyNullUnicodeString, setExpression

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockElaborator

public BlockElaborator()

Method Detail

lazily

public SequenceEvaluator lazily(boolean repeatable,
                                boolean lazyEvaluationRequired)

Description copied from class: Elaborator

Get a function that evaluates the underlying expression lazily

Overrides:

lazily in class Elaborator

Parameters:

repeatable - true if the resulting Sequence must be usable repeatedly; false if it only needs to be used once

lazyEvaluationRequired - true if the expression MUST be evaluated lazily, for example to prevent spurious errors or side-effects if it has been lifted out of a loop

Returns:

an evaluator for the expression that returns a Sequence (which may be a lazy sequence)

elaborateForPull

public PullEvaluator elaborateForPull()

Description copied from class: Elaborator

Get a function that evaluates the underlying expression in the form of a SequenceIterator

Specified by:

elaborateForPull in class PullElaborator

Returns:

an evaluator for the expression that returns a SequenceIterator

elaborateForPush

public PushEvaluator elaborateForPush()

Description copied from class: Elaborator

Get a function that evaluates the underlying expression in push mode, by writing events to an Outputter

Overrides:

elaborateForPush in class PullElaborator

Returns:

an evaluator for the expression in push mode

elaborateForUpdate

public UpdateEvaluator elaborateForUpdate()

Overrides:

elaborateForUpdate in class Elaborator