AI-generated Key Takeaways
-
XPathFunction
provides access to XPath functions, which are identified by QName and arity. -
The primary method,
evaluate
, takes a list of arguments and returns the result of the function evaluation as an Object. -
Implementations of
evaluate
should avoid side-effects, as the order and frequency of calls are not guaranteed. -
If the provided arguments are incompatible with the function, an
XPathFunctionException
is thrown.
XPathFunction
provides access to XPath functions.
Functions are identified by QName and arity in XPath.
Public Method Summary
abstract Object |
Public Methods
public abstract Object evaluate (List args)
Evaluate the function with the specified arguments.
To the greatest extent possible, side-effects should be avoided in the definition of extension functions. The implementation evaluating an XPath expression is under no obligation to call extension functions in any particular order or any particular number of times.
Parameters
args | The arguments, null is a valid value. |
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Returns
- The result of evaluating the
XPath
function as anObject
.
Throws
XPathFunctionException | If args cannot be evaluated with this XPath function.
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