java.lang.Object
org.apache.lucene.search.DocIdSetIterator
org.apache.lucene.queries.spans.Spans
org.apache.lucene.queries.spans.ConjunctionSpans
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
FieldsModifier and TypeFieldDescriptionprivate final int
protected int
protected int
protected int
Fields inherited from class org.apache.lucene.queries.spans.ConjunctionSpans
atFirstInCurrentDoc, conjunction, oneExhaustedInCurrentDoc, subSpans
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
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate static int
advancePosition
(Spans spans, int position) void
collect
(SpanCollector collector) Collect postings data from the leaves of the current Spans.int
Returns the end position for the current start position, or -1 whenSpans.nextStartPosition()
was not yet called on the current doc.int
Returns the next start position for the current doc.int
Returns the start position in the current doc, or -1 whenSpans.nextStartPosition()
was not yet called on the current doc.private boolean
Order the subSpans within the same document by using nextStartPosition on all subSpans after the first as little as necessary.(package private) boolean
private boolean
int
width()
Return the width of the match, which is typically used to sloppy freq.Methods inherited from class org.apache.lucene.queries.spans.ConjunctionSpans
advance, asTwoPhaseIterator, cost, docID, getSubSpans, nextDoc, positionsCost, toMatchDoc
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 -
allowedSlop
private final int allowedSlop
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Constructor Details
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NearSpansOrdered
- Throws:
IOException
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Method Details
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twoPhaseCurrentDocMatches
- Specified by:
twoPhaseCurrentDocMatches
in classConjunctionSpans
- Throws:
IOException
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unpositioned
private boolean unpositioned() -
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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stretchToOrder
Order the subSpans within the same document by using nextStartPosition on all subSpans after the first as little as necessary. Return true when the subSpans could be ordered in this way, otherwise at least one is exhausted in the current doc.- Throws:
IOException
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advancePosition
- 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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