net.sf.saxon.expr.parser

Class Evaluator.SingleItem

java.lang.Object

net.sf.saxon.expr.parser.Evaluator

net.sf.saxon.expr.parser.Evaluator.SingleItem

Enclosing class:

Evaluator

public static final class Evaluator.SingleItem
extends Evaluator

A (default) evaluator for arguments supplied as an expression that will always return a singleton item

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.saxon.expr.parser.Evaluator

Evaluator.EagerSequence, Evaluator.EmptySequenceEvaluator, Evaluator.LazySequence, Evaluator.LazyTail, Evaluator.Literal, Evaluator.MakeIndexedVariable, Evaluator.MemoClosureEvaluator, Evaluator.OptionalItem, Evaluator.Process, Evaluator.SharedAppend, Evaluator.SingleItem, Evaluator.SingletonClosure, Evaluator.StreamingArgument, Evaluator.SuppliedParameter, Evaluator.Variable

Field Summary

Fields

Modifier and Type	Field and Description
static Evaluator.SingleItem	INSTANCE

Method Summary

Modifier and Type	Method and Description
Item	evaluate(Expression expr, XPathContext context) Evaluate an expression to return a sequence
int	getCode() Get the integer code for the evaluator

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final Evaluator.SingleItem INSTANCE

Method Detail

getCode

public int getCode()

Description copied from class: Evaluator

Get the integer code for the evaluator

Specified by:

getCode in class Evaluator

Returns:

the integer code for the evaluator

evaluate

public Item evaluate(Expression expr,
                     XPathContext context)
              throws XPathException

Description copied from class: Evaluator

Evaluate an expression to return a sequence

Specified by:

evaluate in class Evaluator

Parameters:

expr - the expression to be evaluated

context - the dynamic context for evaluation

Returns:

the result of the evaluation

Throws:

XPathException - if any dynamic error occurs during the evaluation