Package net.sf.saxon.xpath

Class XPathFunctionLibrary

java.lang.Object

net.sf.saxon.xpath.XPathFunctionLibrary

All Implemented Interfaces:

FunctionLibrary

public class XPathFunctionLibrary
extends Object
implements FunctionLibrary

The XPathFunctionLibrary is a FunctionLibrary that supports binding of XPath function calls to instances of the JAXP XPathFunction interface returned by an XPathFunctionResolver.

Constructor Summary

Constructors

Constructor	Description
XPathFunctionLibrary()	Construct a XPathFunctionLibrary

Method Summary

Modifier and Type	Method	Description
Expression	bind(SymbolicName.F functionName, Expression[] staticArgs, StaticContext env, List<String> reasons)	Bind a function, given the URI and local parts of the function name, and the list of expressions supplied as arguments.
FunctionLibrary	copy()	This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows new functions to be added, then additions to this copy will not affect the original, or vice versa.
XPathFunctionResolver	getXPathFunctionResolver()	Get the resolver
boolean	isAvailable(SymbolicName.F functionName)	Test whether a function with a given name and arity is available
void	setXPathFunctionResolver(XPathFunctionResolver resolver)	Set the resolver

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.functions.FunctionLibrary

setConfiguration

Constructor Details

XPathFunctionLibrary

public XPathFunctionLibrary()

Construct a XPathFunctionLibrary

Method Details

setXPathFunctionResolver

public void setXPathFunctionResolver(XPathFunctionResolver resolver)

Set the resolver

Parameters:

resolver - The XPathFunctionResolver wrapped by this FunctionLibrary

getXPathFunctionResolver

public XPathFunctionResolver getXPathFunctionResolver()

Get the resolver

Returns:

the XPathFunctionResolver wrapped by this FunctionLibrary

bind

public Expression bind(SymbolicName.F functionName,
 Expression[] staticArgs,
 StaticContext env,
 List<String> reasons)

Bind a function, given the URI and local parts of the function name, and the list of expressions supplied as arguments. This method is called at compile time.

Specified by:

bind in interface FunctionLibrary

Parameters:

functionName - The name of the function

staticArgs - The expressions supplied statically in the function call. The intention is that the static type of the arguments (obtainable via getItemType() and getCardinality() may be used as part of the binding algorithm.

env - The static context

reasons - If no matching function is found by the function library, it may add a diagnostic explanation to this list explaining why none of the available functions could be used.

Returns:

An object representing the extension function to be called, if one is found; null if no extension function was found matching the required name, arity, or signature.

isAvailable

public boolean isAvailable(SymbolicName.F functionName)

Test whether a function with a given name and arity is available

This supports the function-available() function in XSLT.

Specified by:

isAvailable in interface FunctionLibrary

Parameters:

functionName - the qualified name of the function being called

Returns:

true if a function of this name and arity is available for calling

copy

public FunctionLibrary copy()

This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows new functions to be added, then additions to this copy will not affect the original, or vice versa.

Specified by:

copy in interface FunctionLibrary

Returns:

a copy of this function library. This must be an instance of the original class.