Class EarlyTerminatingSortingCollector

A ICollector that early terminates collection of documents on a per-segment basis, if the segment was sorted according to the given Sort.

NOTE: the ICollector detects sorted segments according to SortingMergePolicy, so it's best used in conjunction with it. Also, it collects up to a specified m_numDocsToCollect from each segment, and therefore is mostly suitable for use in conjunction with collectors such as TopDocsCollector<T>, and not e.g. TotalHitCountCollector.

NOTE: If you wrap a TopDocsCollector<T> that sorts in the same order as the index order, the returned GetTopDocs() will be correct. However the total of TotalHits hit count will be underestimated since not all matching documents will have been collected.

NOTE: This ICollector uses ToString() to detect whether a segment was sorted with the same Sort. This has two implications:

  • if a custom comparer is not implemented correctly and returns different identifiers for equivalent instances, this collector will not detect sorted segments,
  • if you suddenly change the IndexWriter's SortingMergePolicy to sort according to another criterion and if both the old and the new Sorts have the same identifier, this ICollector will incorrectly detect sorted segments.
@lucene.experimental

Inheritance
System.Object
EarlyTerminatingSortingCollector
Implements
Namespace: Lucene.Net.Index.Sorter
Assembly: Lucene.Net.Misc.dll
Syntax
public class EarlyTerminatingSortingCollector : object, ICollector

Constructors

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EarlyTerminatingSortingCollector(ICollector, Sort, Int32)

Create a new EarlyTerminatingSortingCollector instance.

Declaration
public EarlyTerminatingSortingCollector(ICollector in, Sort sort, int numDocsToCollect)
Parameters
Type Name Description
ICollector in

the collector to wrap

Sort sort

the sort you are sorting the search results on

System.Int32 numDocsToCollect

the number of documents to collect on each segment. When wrapping a TopDocsCollector<T>, this number should be the number of hits.

Fields

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m_in

The wrapped Collector

Declaration
protected readonly ICollector m_in
Field Value
Type Description
ICollector
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m_numDocsToCollect

Number of documents to collect in each segment

Declaration
protected readonly int m_numDocsToCollect
Field Value
Type Description
System.Int32
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m_segmentSorted

True if the current segment being processed is sorted by Sort()

Declaration
protected bool m_segmentSorted
Field Value
Type Description
System.Boolean
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m_segmentTotalCollect

Number of documents to collect in the current segment being processed

Declaration
protected int m_segmentTotalCollect
Field Value
Type Description
System.Int32
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m_sort

Sort used to sort the search results

Declaration
protected readonly Sort m_sort
Field Value
Type Description
Sort

Properties

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AcceptsDocsOutOfOrder

Declaration
public virtual bool AcceptsDocsOutOfOrder { get; }
Property Value
Type Description
System.Boolean

Methods

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Collect(Int32)

Declaration
public virtual void Collect(int doc)
Parameters
Type Name Description
System.Int32 doc
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SetNextReader(AtomicReaderContext)

Declaration
public virtual void SetNextReader(AtomicReaderContext context)
Parameters
Type Name Description
AtomicReaderContext context
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SetScorer(Scorer)

Declaration
public virtual void SetScorer(Scorer scorer)
Parameters
Type Name Description
Scorer scorer

Implements