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## net.sf.saxon.expr.sort
Class SortedTupleIterator

    java.lang.Object
      net.sf.saxon.expr.sort.SortedIterator
          net.sf.saxon.expr.sort.SortedTupleIterator

All Implemented Interfaces:
  LastPositionFinder, Sortable, SequenceIterator, LookaheadIterator

    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.

Field Summary

Fields inherited from class net.sf.saxon.expr.sort.SortedIterator
`base, comparators, context, count, nodeKeys, position, recordSize, sortKeyEvaluator`

Fields inherited from interface net.sf.saxon.om.SequenceIterator
`GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD`

Constructor Summary
`SortedTupleIterator(XPathContext context, SequenceIterator base, AtomicComparer[] comparators)` Create a sorted tuple iterator

Method Summary
`protected void` | `buildArray()` Override the method that builds the array of values and sort keys.

Methods inherited from class net.sf.saxon.expr.sort.SortedIterator
`close, compare, current, getAnother, getLastPosition, getProperties, hasNext, next, position, setHostLanguage, swap`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

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

Method Detail

### buildArray

    protected void buildArray()
                       throws XPathException

  Override the method that builds the array of values and sort keys.

  Overrides:
    `buildArray` in class `SortedIterator`
  Throws:
    `XPathException`

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Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.