public class ConjunctionDISI extends DocIdSetIterator
org.apache.lucene.search.spans
.Modifier and Type | Class and Description |
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private static class |
ConjunctionDISI.TwoPhase
A conjunction DISI built on top of approximations.
|
private static class |
ConjunctionDISI.TwoPhaseConjunctionDISI
TwoPhaseIterator view of a ConjunctionDISI.TwoPhase conjunction. |
Modifier and Type | Field and Description |
---|---|
(package private) DocIdSetIterator |
lead |
(package private) DocIdSetIterator[] |
others |
NO_MORE_DOCS
Constructor and Description |
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ConjunctionDISI(java.util.List<? extends DocIdSetIterator> iterators) |
Modifier and Type | Method and Description |
---|---|
private static void |
addIterator(DocIdSetIterator disi,
java.util.List<DocIdSetIterator> allIterators,
java.util.List<TwoPhaseIterator> twoPhaseIterators) |
private static void |
addScorer(Scorer scorer,
java.util.List<DocIdSetIterator> allIterators,
java.util.List<TwoPhaseIterator> twoPhaseIterators)
Adds the scorer, possibly splitting up into two phases or collapsing if it is another conjunction
|
private static void |
addSpans(Spans spans,
java.util.List<DocIdSetIterator> allIterators,
java.util.List<TwoPhaseIterator> twoPhaseIterators)
Adds the Spans.
|
private static void |
addTwoPhaseIterator(TwoPhaseIterator twoPhaseIter,
java.util.List<DocIdSetIterator> allIterators,
java.util.List<TwoPhaseIterator> twoPhaseIterators) |
int |
advance(int target)
Advances to the first beyond the current whose document number is greater
than or equal to target, and returns the document number itself.
|
(package private) TwoPhaseIterator |
asTwoPhaseIterator() |
long |
cost()
Returns the estimated cost of this
DocIdSetIterator . |
int |
docID()
Returns the following:
-1 if DocIdSetIterator.nextDoc() or
DocIdSetIterator.advance(int) were not called yet. |
private int |
doNext(int doc) |
static ConjunctionDISI |
intersectIterators(java.util.List<DocIdSetIterator> iterators)
Create a conjunction over the provided DocIdSetIterators.
|
static ConjunctionDISI |
intersectScorers(java.util.List<Scorer> scorers)
Create a conjunction over the provided
Scorer s, taking advantage
of TwoPhaseIterator . |
static ConjunctionDISI |
intersectSpans(java.util.List<Spans> spanList)
Create a conjunction over the provided
Scorer s, taking advantage
of TwoPhaseIterator . |
protected boolean |
matches() |
int |
nextDoc()
Advances to the next document in the set and returns the doc it is
currently on, or
DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the
set.NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior. |
all, empty, slowAdvance
final DocIdSetIterator lead
final DocIdSetIterator[] others
ConjunctionDISI(java.util.List<? extends DocIdSetIterator> iterators)
public static ConjunctionDISI intersectScorers(java.util.List<Scorer> scorers)
Scorer
s, taking advantage
of TwoPhaseIterator
.public static ConjunctionDISI intersectIterators(java.util.List<DocIdSetIterator> iterators)
public static ConjunctionDISI intersectSpans(java.util.List<Spans> spanList)
Scorer
s, taking advantage
of TwoPhaseIterator
.private static void addScorer(Scorer scorer, java.util.List<DocIdSetIterator> allIterators, java.util.List<TwoPhaseIterator> twoPhaseIterators)
private static void addSpans(Spans spans, java.util.List<DocIdSetIterator> allIterators, java.util.List<TwoPhaseIterator> twoPhaseIterators)
private static void addIterator(DocIdSetIterator disi, java.util.List<DocIdSetIterator> allIterators, java.util.List<TwoPhaseIterator> twoPhaseIterators)
private static void addTwoPhaseIterator(TwoPhaseIterator twoPhaseIter, java.util.List<DocIdSetIterator> allIterators, java.util.List<TwoPhaseIterator> twoPhaseIterators)
protected boolean matches() throws java.io.IOException
java.io.IOException
TwoPhaseIterator asTwoPhaseIterator()
private int doNext(int doc) throws java.io.IOException
java.io.IOException
public int advance(int target) throws java.io.IOException
DocIdSetIterator
DocIdSetIterator.NO_MORE_DOCS
if target
is greater than the highest document number in the set.
The behavior of this method is undefined when called with
target ≤ current
, or after the iterator has exhausted.
Both cases may result in unpredicted behavior.
When target > current
it behaves as if written:
int advance(int target) { int doc; while ((doc = nextDoc()) < target) { } return doc; }Some implementations are considerably more efficient than that.
NOTE: this method may be called with DocIdSetIterator.NO_MORE_DOCS
for
efficiency by some Scorers. If your implementation cannot efficiently
determine that it should exhaust, it is recommended that you check for that
value in each call to this method.
advance
in class DocIdSetIterator
java.io.IOException
public int docID()
DocIdSetIterator
-1
if DocIdSetIterator.nextDoc()
or
DocIdSetIterator.advance(int)
were not called yet.
DocIdSetIterator.NO_MORE_DOCS
if the iterator has exhausted.
docID
in class DocIdSetIterator
public int nextDoc() throws java.io.IOException
DocIdSetIterator
DocIdSetIterator.NO_MORE_DOCS
if there are no more docs in the
set.nextDoc
in class DocIdSetIterator
java.io.IOException
public long cost()
DocIdSetIterator
DocIdSetIterator
.
This is generally an upper bound of the number of documents this iterator might match, but may be a rough heuristic, hardcoded value, or otherwise completely inaccurate.
cost
in class DocIdSetIterator