Package org.apache.lucene.queries.spans
Class NearSpansOrdered
java.lang.Object
org.apache.lucene.search.DocIdSetIterator
org.apache.lucene.queries.spans.Spans
org.apache.lucene.queries.spans.NearSpansOrdered
A Spans that is formed from the ordered subspans of a SpanNearQuery where the subspans do not
overlap and have a maximum slop between them.
The formed spans only contains minimum slop matches.
The matching slop is computed from the distance(s) between the non overlapping matching Spans.
Successive matches are always formed from the successive Spans of the SpanNearQuery.
The formed spans may contain overlaps when the slop is at least 1. For example, when querying using
t1 t2 t3with slop at least 1, the fragment:
t1 t2 t1 t3 t2 t3matches twice:
t1 t2 .. t3
t1 .. t2 t3Expert: Only public for subclassing. Most implementations should not need this class
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Field Summary
Modifier and TypeFieldDescriptionprotected int
protected int
protected int
Fields inherited from class org.apache.lucene.queries.spans.Spans
NO_MORE_POSITIONS
Fields inherited from class org.apache.lucene.search.DocIdSetIterator
NO_MORE_DOCS
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionint
advance
(int target) Return aTwoPhaseIterator
view of this ConjunctionSpans.void
collect
(SpanCollector collector) Collect postings data from the leaves of the current Spans.long
cost()
int
docID()
int
Returns the end position for the current start position, or -1 whenSpans.nextStartPosition()
was not yet called on the current doc.Spans[]
int
nextDoc()
int
Returns the next start position for the current doc.float
Return an estimation of the cost of using the positions of thisSpans
for any single document, but only afterSpans.asTwoPhaseIterator()
returnednull
.int
Returns the start position in the current doc, or -1 whenSpans.nextStartPosition()
was not yet called on the current doc.int
width()
Return the width of the match, which is typically used to sloppy freq.Methods inherited from class org.apache.lucene.queries.spans.Spans
doCurrentSpans, doStartCurrentDoc, toString
Methods inherited from class org.apache.lucene.search.DocIdSetIterator
all, empty, range, slowAdvance
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Field Details
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matchStart
protected int matchStart -
matchEnd
protected int matchEnd -
matchWidth
protected int matchWidth
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Constructor Details
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NearSpansOrdered
- Throws:
IOException
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Method Details
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nextStartPosition
Description copied from class:Spans
Returns the next start position for the current doc. There is always at least one start/end position per doc. After the last start/end position at the current doc this returnsSpans.NO_MORE_POSITIONS
.- Specified by:
nextStartPosition
in classSpans
- Throws:
IOException
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startPosition
public int startPosition()Description copied from class:Spans
Returns the start position in the current doc, or -1 whenSpans.nextStartPosition()
was not yet called on the current doc. After the last start/end position at the current doc this returnsSpans.NO_MORE_POSITIONS
.- Specified by:
startPosition
in classSpans
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endPosition
public int endPosition()Description copied from class:Spans
Returns the end position for the current start position, or -1 whenSpans.nextStartPosition()
was not yet called on the current doc. After the last start/end position at the current doc this returnsSpans.NO_MORE_POSITIONS
.- Specified by:
endPosition
in classSpans
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width
public int width()Description copied from class:Spans
Return the width of the match, which is typically used to sloppy freq. It is only legal to call this method when the iterator is on a valid doc ID and positioned. The return value must be positive, and lower values means that the match is better. -
collect
Description copied from class:Spans
Collect postings data from the leaves of the current Spans.This method should only be called after
Spans.nextStartPosition()
, and beforeSpans.NO_MORE_POSITIONS
has been reached.- Specified by:
collect
in classSpans
- Parameters:
collector
- a SpanCollector- Throws:
IOException
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docID
public int docID()- Specified by:
docID
in classDocIdSetIterator
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cost
public long cost()- Specified by:
cost
in classDocIdSetIterator
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nextDoc
- Specified by:
nextDoc
in classDocIdSetIterator
- Throws:
IOException
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advance
- Specified by:
advance
in classDocIdSetIterator
- Throws:
IOException
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asTwoPhaseIterator
Return aTwoPhaseIterator
view of this ConjunctionSpans.- Overrides:
asTwoPhaseIterator
in classSpans
- See Also:
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positionsCost
public float positionsCost()Description copied from class:Spans
Return an estimation of the cost of using the positions of thisSpans
for any single document, but only afterSpans.asTwoPhaseIterator()
returnednull
. Otherwise this method should not be called. The returned value is independent of the current document.- Specified by:
positionsCost
in classSpans
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getSubSpans
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