Class SortedTupleIterator

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

    public class SortedTupleIterator
    extends SortedIterator
    A SortedTupleIterator is a modified SortedIterator. Whereas the sorted iterator used by XSLT computes the sort key of each item in a sequence, using that item as the context item, the SortedTupleIterator used by XQuery precomputes the sort keys from scratch; they do not need to be a function of the item being sorted.

    The items returned by the SortedTupleIterator are instance of ObjectValue, which encapsulate a Value representing the contents of the tuple.

    • Constructor Detail

      • SortedTupleIterator

        public SortedTupleIterator​(XPathContext context,
                                   SequenceIterator base,
                                   AtomicComparer[] comparators)
        Create a sorted tuple iterator
        Parameters:
        context - the dynamic context
        base - the base iterator, which returns the unsorted tuples. Each tuple is represented by an ObjectValue which wraps an array of Value objects. The first Value object represents the tuple itself. Subsequent Value objects represent the sort key values, in order.
        comparators - the comparators used for comparing sort keys