Class ForClausePull

  • Direct Known Subclasses:

    public class ForClausePull
    extends TuplePull
    This class implements the changes to the tuple stream effected by a "for" clause in a FLWOR expression
    • Method Detail

      • nextTuple

        public boolean nextTuple​(XPathContext context)
                          throws XPathException
        Move on to the next tuple. Before returning, this method must set all the variables corresponding to the "returned" tuple in the local stack frame associated with the context object
        Specified by:
        nextTuple in class TuplePull
        context - the dynamic evaluation context
        true if another tuple has been generated; false if the tuple stream is exhausted. If the method returns false, the values of the local variables corresponding to this tuple stream are undefined.
        XPathException - if any error occurs
      • variableValue

        protected GroundedValue variableValue​(Item item)
        Get the value to be bound to the iteration variable
        item - the value returned by the sequence iterator
        the value to be assigned to the iteration variable
      • close

        public void close()
        Close the tuple stream, indicating that although not all tuples have been read, no further tuples are required and resources can be released
        close in class TuplePull