Package net.sf.saxon.sort
Class SortedTupleIterator
java.lang.Object
net.sf.saxon.sort.SortedIterator
net.sf.saxon.sort.SortedTupleIterator
- All Implemented Interfaces:
LastPositionFinder
,LookaheadIterator
,SequenceIterator
,Sortable
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.
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Field Summary
Fields inherited from class net.sf.saxon.sort.SortedIterator
base, comparators, context, count, nodeKeys, position, recordSize, sortKeyEvaluator
Fields inherited from interface net.sf.saxon.om.SequenceIterator
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
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Constructor Summary
ConstructorsConstructorDescriptionSortedTupleIterator
(XPathContext context, SequenceIterator base, AtomicComparer[] comparators) Create a sorted tuple iterator -
Method Summary
Modifier and TypeMethodDescriptionprotected void
Override the method that builds the array of values and sort keys.Methods inherited from class net.sf.saxon.sort.SortedIterator
close, compare, current, getAnother, getLastPosition, getProperties, hasNext, next, position, setHostLanguage, swap
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Constructor Details
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SortedTupleIterator
public SortedTupleIterator(XPathContext context, SequenceIterator base, AtomicComparer[] comparators) Create a sorted tuple iterator- Parameters:
context
- the dynamic contextbase
- 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
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Method Details
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buildArray
Override the method that builds the array of values and sort keys.- Overrides:
buildArray
in classSortedIterator
- Throws:
XPathException
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