Class CompileTimeFunction

    • Constructor Detail

      • CompileTimeFunction

        public CompileTimeFunction()
    • Method Detail

      • preEvaluate

        public Expression preEvaluate​(ExpressionVisitor visitor)
                               throws XPathException
        preEvaluate: this method suppresses compile-time evaluation by doing nothing. (this is because the default implementation of preEvaluate() calls evaluate() which is not available for these functions)
        Overrides:
        preEvaluate in class FunctionCall
        Parameters:
        visitor - an expression visitor
        Returns:
        the result of the early evaluation, or the original expression, or potentially a simplified expression
        Throws:
        XPathException - if evaluation fails
      • evaluateItem

        public final Item evaluateItem​(XPathContext c)
                                throws XPathException
        Evaluate as a single item
        Overrides:
        evaluateItem in class Expression
        Parameters:
        c - 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
      • iterate

        public final SequenceIterator iterate​(XPathContext c)
        Iterate over the results of the function
        Overrides:
        iterate in class Expression
        Parameters:
        c - supplies the context for evaluation
        Returns:
        a SequenceIterator that can be used to iterate over the result of the expression