Class HeadFn

    • Constructor Detail

      • HeadFn

        public HeadFn()
    • Method Detail

      • makeFunctionCall

        public Expression makeFunctionCall​(Expression[] arguments)
        Description copied from class: SystemFunction
        Make an expression that either calls this function, or that is equivalent to a call on this function
        Overrides:
        makeFunctionCall in class SystemFunction
        Parameters:
        arguments - the supplied arguments to the function call
        Returns:
        either a function call on this function, or an expression that delivers the same result
      • call

        public Sequence call​(XPathContext context,
                             Sequence[] arguments)
                      throws XPathException
        Evaluate the expression
        Parameters:
        context - the dynamic evaluation context
        arguments - the values of the arguments, supplied as Sequences
        Returns:
        the result of the evaluation, in the form of a Sequence
        Throws:
        XPathException - if a dynamic error occurs during the evaluation of the expression