Package net.sf.saxon.functions.hof

Class FoldLeftFn

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.FoldingFunction

net.sf.saxon.functions.hof.FoldLeftFn

All Implemented Interfaces:

Callable, FunctionItem, GroundedValue, Item, Sequence

public class FoldLeftFn
extends FoldingFunction

This class implements the function fn:fold-left(), which is a standard function in XPath 3.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FoldLeftFn.FoldLeftFold

Constructor Summary

Constructors

Constructor	Description
FoldLeftFn()

Method Summary

Modifier and Type	Method	Description
Fold	getFold(XPathContext context, Sequence... arguments)	Create the Fold object which actually performs the evaluation.
ItemType	getResultItemType(Expression[] args)	Get the return type, given knowledge of the actual arguments

Methods inherited from class net.sf.saxon.functions.FoldingFunction

call, getStreamerName

Methods inherited from class net.sf.saxon.functions.SystemFunction

dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getElaborator, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeFunctionCall, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCaller

Methods inherited from class net.sf.saxon.functions.AbstractFunction

atomize, deepEqual40, deepEquals, effectiveBooleanValue, getAnnotations, getUnicodeStringValue, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.saxon.om.FunctionItem

getGenre

Methods inherited from interface net.sf.saxon.om.GroundedValue

asIterable, concatenate, containsNode, materialize

Methods inherited from interface net.sf.saxon.om.Item

getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence

Methods inherited from interface net.sf.saxon.om.Sequence

makeRepeatable

Constructor Details

FoldLeftFn

public FoldLeftFn()

Method Details

getFold

public Fold getFold(XPathContext context,
 Sequence... arguments)
             throws XPathException

Description copied from class: FoldingFunction

Create the Fold object which actually performs the evaluation. Must be implemented in every subclass.

Specified by:

getFold in class FoldingFunction

Parameters:

context - the dynamic evaluation context

arguments - the values of all arguments other than the first.

Returns:

the Fold object used to compute the function

Throws:

XPathException - if a dynamic error occurs

getResultItemType

public ItemType getResultItemType(Expression[] args)

Get the return type, given knowledge of the actual arguments

Overrides:

getResultItemType in class SystemFunction

Parameters:

args - the actual arguments supplied

Returns:

the best available item type that the function will return