Class ExpressionFn

    • Constructor Detail

      • ExpressionFn

        public ExpressionFn()
    • Method Detail

      • call

        public ExternalObject<Evaluate.PreparedExpression> call​(XPathContext context,
                                                                Sequence[] arguments)
                                                         throws XPathException
        Description copied from class: Evaluate
        Evaluate this function call at run-time
        Specified by:
        call in interface Callable
        Specified by:
        call in interface Function
        call in class Evaluate
        context - The XPath dynamic evaluation context
        arguments - The values of the arguments to the function call. Each argument value (which is in general a sequence) is supplied in the form of an iterator over the items in the sequence. If required, the supplied sequence can be materialized by calling, for example, new SequenceExtent(arguments[i]). If the argument is always a singleton, then the single item may be obtained by calling arguments[i].next(). The implementation is not obliged to read all the items in each SequenceIterator if they are not required to compute the result; but if any SequenceIterator is not read to completion, it is good practice to call its close() method.
        an iterator over the results of the function. If the result is a single item, it can be returned in the form of a SingletonIterator. If the result is an empty sequence, the method should return EmptyIterator.getInstance()
        XPathException - if a dynamic error occurs during evaluation of the function. The Saxon run-time code will add information about the error location.