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XPathFunctionResolver


javax.xml.xpath

Interface XPathFunctionResolver



  • public interface XPathFunctionResolver

    XPathFunctionResolver provides access to the set of user defined XPathFunctions.

    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.

    Since:
    1.5
    See Also:
    XML Path Language (XPath) Version 1.0, Core Function Library
    • Method Summary

      Methods
      Modifier and Type Method and Description
      XPathFunction resolveFunction(QName functionName, int arity)
      Find a function in the set of available functions.
    • Method Detail

      • resolveFunction

        XPathFunction resolveFunction(QName functionName,
                                    int arity)

        Find a function in the set of available functions.

        If functionName or arity is null, then a NullPointerException is thrown.

        Parameters:
        functionName - The function name.
        arity - The number of arguments that the returned function must accept.
        Returns:
        The function or null if no function named functionName with arity arguments exists.
        Throws:
        NullPointerException - If functionName or arity is null.


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