Class SharedAppendEvaluator

  • All Implemented Interfaces:
    SequenceEvaluator

    public class SharedAppendEvaluator
    extends Object
    implements SequenceEvaluator
    Evaluator for expressions that are evaluated in "shared append" mode. This mode is used when the optimizer establishes that a sequence is being built incrementally, typically via a sequence of recursive function calls. The sequence itself is implemented as a ZenoSequence to make incremental append (at either end) efficient, without copying the entirety of the existing sequence.
    • Constructor Detail

      • SharedAppendEvaluator

        public SharedAppendEvaluator​(Block expr)
    • Method Detail

      • evaluate

        public Sequence evaluate​(XPathContext context)
                          throws XPathException
        Evaluate a construct to produce a value (which might be a lazily evaluated Sequence)
        Specified by:
        evaluate in interface SequenceEvaluator
        Parameters:
        context - the evaluation context
        Returns:
        a Sequence (not necessarily grounded)
        Throws:
        XPathException - if a dynamic error occurs during the evaluation.