protected class ConstantScoreQuery.ConstantScorer extends Scorer
NO_MORE_DOCS| Constructor and Description |
|---|
ConstantScoreQuery.ConstantScorer(Similarity similarity,
DocIdSetIterator docIdSetIterator,
Weight w) |
| Modifier and Type | Method and Description |
|---|---|
int |
advance(int target)
Advances to the first beyond (see NOTE below) the current whose document
number is greater than or equal to target.
|
int |
docID()
Returns the following:
-1 or
DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or
DocIdSetIterator.advance(int) were not called yet. |
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. |
float |
score()
Returns the score of the current document matching the query.
|
void |
score(Collector collector)
Scores and collects all matching documents.
|
protected boolean |
score(Collector collector,
int max,
int firstDocID)
Expert: Collects matching documents in a range.
|
freq, getSimilarity, visitScorers, visitSubScorerspublic ConstantScoreQuery.ConstantScorer(Similarity similarity, DocIdSetIterator docIdSetIterator, Weight w) throws IOException
IOExceptionpublic int nextDoc()
throws IOException
DocIdSetIteratorDocIdSetIterator.NO_MORE_DOCS if there are no more docs in the
set.nextDoc in class DocIdSetIteratorIOExceptionpublic int docID()
DocIdSetIteratorDocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or
DocIdSetIterator.advance(int) were not called yet.
DocIdSetIterator.NO_MORE_DOCS if the iterator has exhausted.
docID in class DocIdSetIteratorpublic float score()
throws IOException
ScorerDocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int)
is called the first time, or when called from within
Collector.collect(int).score in class ScorerIOExceptionpublic int advance(int target)
throws IOException
DocIdSetIteratorDocIdSetIterator.NO_MORE_DOCS if there are no more docs in the
set.
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: when target ≤ current implementations may opt
not to advance beyond their current DocIdSetIterator.docID().
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.
NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.
advance in class DocIdSetIteratorIOExceptionpublic void score(Collector collector) throws IOException
Scorerscore in class Scorercollector - The collector to which all matching documents are passed.IOExceptionprotected boolean score(Collector collector, int max, int firstDocID) throws IOException
ScorerfirstDocID is added to ensure that DocIdSetIterator.nextDoc()
was called before this method.
NOTE: Because of backwards compatibility, this method is still
declared as protected, but it is intended to be public,
because it's called from other classes (like BooleanScorer).
If you subclass Scorer, you should declare the overridden method
as public to ease transition to Lucene 4.0, where it will be public.
score in class Scorercollector - The collector to which all matching documents are passed.max - Do not score documents past this.firstDocID - The first document ID (ensures DocIdSetIterator.nextDoc() is called before
this method.IOException