com.saxonica.functions.hof

Class CurriedFunction

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

com.saxonica.functions.hof.CurriedFunction

All Implemented Interfaces:

Callable, Function, GroundedValue, Item, Sequence

public class CurriedFunction
extends AbstractFunction

A function obtained by currying another function, that is, the result of calling fn:partial-apply

Constructor Summary

Constructors

Constructor and Description
CurriedFunction(Function targetFunction, Sequence[] boundValues) Create a curried function

Method Summary

Modifier and Type	Method and Description
Sequence	call(XPathContext context, Sequence[] args) Invoke the function
void	export(ExpressionPresenter out) Output information about this function item
int	getArity() Get the arity of the function (equal to the number of placeholders)
java.lang.String	getDescription() Get a description of this function for use in error messages.
FunctionItemType	getFunctionItemType() Get the item type of the function item
StructuredQName	getFunctionName() Get the name of the function, or null if it is anonymous

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

atomize, deepEquals, effectiveBooleanValue, getAnnotations, getOperandRoles, getStringValue, getStringValueCS, isArray, isMap, isTrustedResultType, makeNewContext, simplify, typeCheck

Methods inherited from class net.sf.saxon.om.AbstractItem

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

Methods inherited from class java.lang.Object

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

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

iterate

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

head

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

getLength, head, itemAt, reduce, subsequence

Constructor Detail

CurriedFunction

public CurriedFunction(Function targetFunction,
                       Sequence[] boundValues)
                throws XPathException

Create a curried function

Parameters:

targetFunction - the function to be curried

boundValues - the values to which the arguments are to be bound, representing unbound values (placeholders) by null

Throws:

XPathException - if any $boundArg does not exist among the arguments

Method Detail

getFunctionItemType

public FunctionItemType getFunctionItemType()

Get the item type of the function item

Returns:

the function item's type

getFunctionName

public StructuredQName getFunctionName()

Get the name of the function, or null if it is anonymous

Returns:

the function name, or null for an anonymous inline function

getDescription

public java.lang.String getDescription()

Get a description of this function for use in error messages. For named functions, the description is the function name (as a lexical QName). For others, it might be, for example, "inline function", or "partially-applied ends-with function".

Returns:

a description of the function for use in error messages

getArity

public int getArity()

Get the arity of the function (equal to the number of placeholders)

Returns:

the number of arguments in the function signature

call

public Sequence call(XPathContext context,
                     Sequence[] args)
              throws XPathException

Invoke the function

Parameters:

context - the XPath dynamic evaluation context

args - the actual arguments to be supplied

Returns:

the result of invoking the function

Throws:

XPathException

export

public void export(ExpressionPresenter out)
            throws XPathException

Output information about this function item

Specified by:

export in interface Function

Overrides:

export in class AbstractFunction

Parameters:

out - the destination to write to

Throws:

XPathException