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org.jaxen

Interface FunctionContext

Known Implementing Classes:
SimpleFunctionContext, XPathFunctionContext
public interface FunctionContext
Implemented by classes that know how to resolve XPath function names and namespaces to implementations of these functions.

By using a custom FunctionContext, new or different functions may be installed and available to XPath expression writers.

Author:
bob mcwhirter
See Also:
XPathFunctionContext

Method Summary

Function
getFunction(String namespaceURI, String prefix, String localName)
An implementation should return a Function implementation object based on the namespace URI and local name of the function-call expression.

Method Details

getFunction

public Function getFunction(String namespaceURI,
                            String prefix,
                            String localName)
            throws UnresolvableException
An implementation should return a Function implementation object based on the namespace URI and local name of the function-call expression.

It must not use the prefix parameter to select an implementation, because a prefix could be bound to any namespace; the prefix parameter could be used in debugging output or other generated information. The prefix may otherwise be completely ignored.

Parameters:
namespaceURI - the namespace URI to which the prefix parameter is bound in the XPath expression. If the function call expression had no prefix, the namespace URI is null.
prefix - the prefix that was used in the function call expression
localName - the local name of the function-call expression. If there is no prefix, then this is the whole name of the function.
Returns:
a Function implementation object.
Throws:
UnresolvableException - when the function cannot be resolved

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