Package net.sf.saxon.sort
Class SortedTupleIterator
- java.lang.Object
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- net.sf.saxon.sort.SortedIterator
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- net.sf.saxon.sort.SortedTupleIterator
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- 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.
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Field Summary
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Fields inherited from class net.sf.saxon.sort.SortedIterator
base, comparators, context, count, nodeKeys, position, recordSize, sortKeyEvaluator
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Fields inherited from interface net.sf.saxon.om.SequenceIterator
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
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Constructor Summary
Constructors Constructor Description SortedTupleIterator(XPathContext context, SequenceIterator base, AtomicComparer[] comparators)
Create a sorted tuple iterator
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
buildArray()
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 Detail
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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 Detail
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buildArray
protected void buildArray() throws XPathException
Override the method that builds the array of values and sort keys.- Overrides:
buildArray
in classSortedIterator
- Throws:
XPathException
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