Package net.sf.saxon.expr.elab

Class SingleItemEvaluator

java.lang.Object
net.sf.saxon.expr.elab.SingleItemEvaluator
All Implemented Interfaces:
SequenceEvaluator
public class SingleItemEvaluator extends Object implements SequenceEvaluator
A SequenceEvaluator for expressions that return a single item (exactly one, never an empty sequence).

  • Constructor Details

    • SingleItemEvaluator

      public SingleItemEvaluator(ItemEvaluator eval)

  • Method Details

    • 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.