Class SortedGroupIterator

  • All Implemented Interfaces:
    LastPositionFinder, GroupIterator, Sortable, SequenceIterator, LookaheadIterator

    public class SortedGroupIterator
    extends SortedIterator
    implements GroupIterator
    A SortedGroupIterator is a modified SortedIterator. It sorts a sequence of groups, and is itself a GroupIterator. The modifications retain extra information about the items being sorted. The items are each the leading item of a group, and as well as the item itself, the iterator preserves information about the group: specifically, an iterator over the items in the group, and the value of the grouping key (if any).
    • Method Detail

      • getCurrentGroupingKey

        public Value getCurrentGroupingKey()
        Description copied from interface: GroupIterator
        Get the grouping key of the current group
        Specified by:
        getCurrentGroupingKey in interface GroupIterator
        Returns:
        the current grouping key in the case of group-by or group-adjacent, or null in the case of group-starting-with and group-ending-with
      • iterateCurrentGroup

        public SequenceIterator iterateCurrentGroup()
                                             throws XPathException
        Description copied from interface: GroupIterator
        Get an iterator over the members of the current group, in population order. This must always be a clean iterator, that is, an iterator that starts at the first item of the group.
        Specified by:
        iterateCurrentGroup in interface GroupIterator
        Returns:
        an iterator over all the members of the current group, in population order.
        Throws:
        XPathException - if a dynamic error occurs