Class Available

    • Constructor Detail

      • Available

        public Available()
    • Method Detail

      • preEvaluate

        public Expression preEvaluate​(ExpressionVisitor visitor)
                               throws XPathException
        preEvaluate: this method uses the static context to do early evaluation of the function if the argument is known (which is the normal case)
        Overrides:
        preEvaluate in class FunctionCall
        Parameters:
        visitor - the expression visitor
        Returns:
        the result of the early evaluation, or the original expression, or potentially a simplified expression
        Throws:
        XPathException
      • evaluateItem

        public Item evaluateItem​(XPathContext context)
                          throws XPathException
        Run-time evaluation. This is the only thing in the spec that requires information about in-scope functions to be available at run-time. However, we keep it because it's handy for some other things such as saxon:evaluate().
        Specified by:
        evaluateItem in interface EvaluableItem
        Overrides:
        evaluateItem in class Expression
        Parameters:
        context - The context in which the expression is to be evaluated
        Returns:
        the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence
        Throws:
        XPathException - if any dynamic error occurs evaluating the expression