Java in a Nutshell, 5th Edition [Electronic resources] نسخه متنی

This
interface defines a single method to
return the XPathFunction with the specified
qualified name and specified arity (number of arguments). Objects
that implement this interface may be passed to the
setXPathFunctionResolver( ) methods of
XPath or XPathFactory.

Note that the function resolvers are invoked only for functions
defined in an external namespace, so they cannot be used to override
the meaning of XPath's built-in functions or to add
new core functions to the XPath language. Also, if the
XMLConstants.FEATURE_SECURE_PROCESSING feature has
been enabled on an XPathFactory, user-defined
functions are not allowed in XPath expressions, and the
XPathFunctionResolver is never called.

public interface

XPathFunctionResolver {
// Public Instance Methods
XPathFunction

resolveFunction (javax.xml.namespace.QName

functionName , int

arity );
}

Passed To

XPath.setXPathFunctionResolver( ),
XPathFactory.setXPathFunctionResolver( )

Returned By

XPath.getXPathFunctionResolver( )