XPathFunctionResolver
interface XPathFunctionResolver
javax.xml.xpath.XPathFunctionResolver |
XPathFunctionResolver
provides access to the set of user defined XPathFunction
s.
XPath functions are resolved by name and arity. The resolver is not needed for XPath built-in functions and the resolver cannot be used to override those functions.
In particular, the resolver is only called for functions in an another namespace (functions with an explicit prefix). This means that you cannot use the XPathFunctionResolver
to implement specifications like XML-Signature Syntax and Processing which extend the function library of XPath 1.0 in the same namespace. This is a consequence of the design of the resolver.
If you wish to implement additional built-in functions, you will have to extend the underlying implementation directly.
Summary
Public methods | |
---|---|
abstract XPathFunction! |
resolveFunction(functionName: QName!, arity: Int) Find a function in the set of available functions. |
Public methods
resolveFunction
abstract fun resolveFunction(
functionName: QName!,
arity: Int
): XPathFunction!
Find a function in the set of available functions.
If functionName
or arity
is null
, then a NullPointerException
is thrown.
Parameters | |
---|---|
functionName |
QName!: The function name. |
arity |
Int: The number of arguments that the returned function must accept. |
Return | |
---|---|
XPathFunction! |
The function or null if no function named functionName with arity arguments exists. |
Exceptions | |
---|---|
java.lang.NullPointerException |
If functionName or arity is null . |