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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.
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 Detail |
public Function getFunction(String namespaceURI, String prefix, String localName) throws UnresolvableException
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.
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.UnresolvableException
- when the function cannot be resolved.
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