Class Evaluator.OptionalItem

  • Enclosing class:
    Evaluator

    public static final class Evaluator.OptionalItem
    extends Evaluator
    A (default) evaluator for arguments supplied as an expression that will return either a singleton item, or an empty sequence
    • Constructor Detail

      • OptionalItem

        public OptionalItem()
    • Method Detail

      • getCode

        public int getCode()
        Description copied from class: Evaluator
        Get the integer code for the evaluator
        Specified by:
        getCode in class Evaluator
        Returns:
        the integer code for the evaluator
      • evaluate

        public Sequence evaluate​(Expression expr,
                                 XPathContext context)
                          throws XPathException
        Description copied from class: Evaluator
        Evaluate an expression to return a sequence
        Specified by:
        evaluate in class Evaluator
        Parameters:
        expr - the expression to be evaluated
        context - the dynamic context for evaluation
        Returns:
        the result of the evaluation
        Throws:
        XPathException - if any dynamic error occurs during the evaluation