net.sf.saxon.functions

Class CallableFunction

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.CallableFunction

All Implemented Interfaces:

PullEvent, Callable, Function, GroundedValue, Item, Sequence

public class CallableFunction
extends AbstractFunction

A function item that wraps a Callable

Constructor Summary

Constructors

Constructor and Description
CallableFunction(int arity, Callable callable, FunctionItemType type)
CallableFunction(SymbolicName name, Callable callable, FunctionItemType type)

Method Summary

Methods

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 to the diagnostic explain() output
int	getArity() Get the arity of the function
Callable	getCallable()
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
void	setCallable(Callable callable)
void	setType(FunctionItemType type)

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

atomize, deepEquals, effectiveBooleanValue, getOperandRoles, getStringValue, getStringValueCS, isArray, isMap, optimize, simplify, typeCheck

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

getLength, head, 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

CallableFunction

public CallableFunction(SymbolicName name,
                Callable callable,
                FunctionItemType type)

CallableFunction

public CallableFunction(int arity,
                Callable callable,
                FunctionItemType type)

Method Detail

getCallable

public Callable getCallable()

setCallable

public void setCallable(Callable callable)

setType

public void setType(FunctionItemType type)

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 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

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 - if a dynamic error occurs within the function

export

public void export(ExpressionPresenter out)

Output information about this function item to the diagnostic explain() output

Specified by:

export in interface Function

Overrides:

export in class AbstractFunction

Parameters:

out -