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java.lang.Objectorg.apache.lucene.search.Collector
org.apache.lucene.search.PositiveScoresOnlyCollector
public class PositiveScoresOnlyCollector
A Collector
implementation which wraps another
Collector
and makes sure only documents with
scores > 0 are collected.
Constructor Summary | |
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PositiveScoresOnlyCollector(Collector c)
|
Method Summary | |
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boolean |
acceptsDocsOutOfOrder()
Returns true iff this Collector can accept documents given to
Collector.collect(int) out of order. |
void |
collect(int doc)
Called once for every document matching a query, with the unbased document number. |
void |
setNextReader(IndexReader reader,
int docBase)
Called before collecting from each IndexReader. |
void |
setScorer(Scorer scorer)
Called before successive calls to Collector.collect(int) . |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public PositiveScoresOnlyCollector(Collector c)
Method Detail |
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public void collect(int doc) throws IOException
Collector
Note: This is called in an inner search loop. For good search performance,
implementations of this method should not call Searcher.doc(int)
or
IndexReader.document(int)
on every hit.
Doing so can slow searches by an order of magnitude or more.
collect
in class Collector
IOException
public void setNextReader(IndexReader reader, int docBase) throws IOException
Collector
Collector.collect(int)
will correspond to reader.
Add docBase to the current IndexReaders internal document id to re-base ids
in Collector.collect(int)
.
setNextReader
in class Collector
reader
- next IndexReader
IOException
public void setScorer(Scorer scorer) throws IOException
Collector
Collector.collect(int)
. Implementations
that need the score of the current document (passed-in to
Collector.collect(int)
), should save the passed-in Scorer and call
scorer.score() when needed.
setScorer
in class Collector
IOException
public boolean acceptsDocsOutOfOrder()
Collector
Collector
can accept documents given to
Collector.collect(int)
out of order.
NOTE: some collectors can work in either mode, with a more efficient
implementation for in-order docs collection. If your collector can work in
either mode, it is recommended that you create two variants of it, since
some queries work much faster if out-of-order collection is supported by a
Collector
.
acceptsDocsOutOfOrder
in class Collector
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