Interface XPathFunctionResolver
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public interface XPathFunctionResolverXPathFunctionResolverprovides access to the set of user definedXPathFunctions.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
XPathFunctionResolverto 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.
- Since:
- 1.5
- See Also:
- XML Path Language (XPath) Version 1.0, Core Function Library
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description XPathFunctionresolveFunction(QName functionName, int arity)Find a function in the set of available functions.
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Method Detail
resolveFunction
XPathFunction resolveFunction(QName functionName, int arity)
Find a function in the set of available functions.
If
functionNameorarityisnull, then aNullPointerExceptionis thrown.- Parameters:
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functionName- The function name. -
arity- The number of arguments that the returned function must accept. - Returns:
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The function or
nullif no function namedfunctionNamewitharityarguments exists. - Throws:
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NullPointerException- IffunctionNameorarityisnull.
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