public class BlockMaxDISI extends DocIdSetIterator
DocIdSetIterator that skips non-competitive docs by checking
the max score of the provided Scorer for the current block.
Call setMinCompetitiveScore(float) in order to give this iterator the ability
to skip low-scoring documents.| Modifier and Type | Field and Description |
|---|---|
private DocIdSetIterator |
in |
private float |
maxScore |
private float |
minScore |
protected Scorer |
scorer |
private int |
upTo |
NO_MORE_DOCS| Constructor and Description |
|---|
BlockMaxDISI(DocIdSetIterator iterator,
Scorer scorer) |
| Modifier and Type | Method and Description |
|---|---|
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.
|
private int |
advanceImpacts(int target) |
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 void |
moveToNextBlock(int target) |
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. |
void |
setMinCompetitiveScore(float minScore) |
all, empty, range, slowAdvanceprotected final Scorer scorer
private final DocIdSetIterator in
private float minScore
private float maxScore
private int upTo
public BlockMaxDISI(DocIdSetIterator iterator, Scorer scorer)
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 DocIdSetIteratorpublic int nextDoc()
throws java.io.IOException
DocIdSetIteratorDocIdSetIterator.NO_MORE_DOCS if there are no more docs in the
set.nextDoc in class DocIdSetIteratorjava.io.IOExceptionpublic int advance(int target)
throws java.io.IOException
DocIdSetIteratorDocIdSetIterator.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 DocIdSetIteratorjava.io.IOExceptionpublic long cost()
DocIdSetIteratorDocIdSetIterator.
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 DocIdSetIteratorpublic void setMinCompetitiveScore(float minScore)
private void moveToNextBlock(int target)
throws java.io.IOException
java.io.IOExceptionprivate int advanceImpacts(int target)
throws java.io.IOException
java.io.IOException