FacetsCollector (org.apache.lucene.facet)

java.lang.Object
- SimpleCollector
- - org.apache.lucene.facet.FacetsCollector

Direct Known Subclasses:

RandomSamplingFacetsCollector
```
public class FacetsCollector
extends SimpleCollector
```
Collects hits for subsequent faceting. Once you've run a search and collect hits into this, instantiate one of the Facets subclasses to do the facet counting. Use the search utility methods to perform an "ordinary" search but also collect into a Collector.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class FacetsCollector.MatchingDocs
Holds the documents that were matched in the org.apache.lucene.index.LeafReaderContext.

Nested Classes
Modifier and Type	Class and Description
`static class`	`FacetsCollector.MatchingDocs` Holds the documents that were matched in the `org.apache.lucene.index.LeafReaderContext`.

Constructor Summary

Constructors
Constructor and Description
`FacetsCollector()` Default constructor
`FacetsCollector(boolean keepScores)` Create this; if `keepScores` is true then a float[] is allocated to hold score of all hits.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`collect(int doc)`
`protected void`	`doSetNextReader(LeafReaderContext context)`
`boolean`	`getKeepScores()` True if scores were saved.
`java.util.List<FacetsCollector.MatchingDocs>`	`getMatchingDocs()` Returns the documents matched by the query, one `FacetsCollector.MatchingDocs` per visited segment.
`ScoreMode`	`scoreMode()`
`static TopDocs`	`search(IndexSearcher searcher, Query q, int n, Collector fc)` Utility method, to search and also collect all hits into the provided `Collector`.
`static TopFieldDocs`	`search(IndexSearcher searcher, Query q, int n, Sort sort, boolean doDocScores, Collector fc)` Utility method, to search and also collect all hits into the provided `Collector`.
`static TopFieldDocs`	`search(IndexSearcher searcher, Query q, int n, Sort sort, Collector fc)` Utility method, to search and also collect all hits into the provided `Collector`.
`static TopDocs`	`searchAfter(IndexSearcher searcher, ScoreDoc after, Query q, int n, Collector fc)` Utility method, to search and also collect all hits into the provided `Collector`.
`static TopDocs`	`searchAfter(IndexSearcher searcher, ScoreDoc after, Query q, int n, Sort sort, boolean doDocScores, Collector fc)` Utility method, to search and also collect all hits into the provided `Collector`.
`static TopDocs`	`searchAfter(IndexSearcher searcher, ScoreDoc after, Query q, int n, Sort sort, Collector fc)` Utility method, to search and also collect all hits into the provided `Collector`.
`void`	`setScorer(Scorable scorer)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- FacetsCollector
```
public FacetsCollector()
```
  Default constructor
- FacetsCollector
```
public FacetsCollector(boolean keepScores)
```
  Create this; if keepScores is true then a float[] is allocated to hold score of all hits.

Method Detail

getKeepScores
```
public final boolean getKeepScores()
```
True if scores were saved.

getMatchingDocs
```
public java.util.List<FacetsCollector.MatchingDocs> getMatchingDocs()
```
Returns the documents matched by the query, one FacetsCollector.MatchingDocs per visited segment.

collect

public final void collect(int doc)
                   throws java.io.IOException

Throws:: java.io.IOException

scoreMode
```
public ScoreMode scoreMode()
```

setScorer

public final void setScorer(Scorable scorer)
                     throws java.io.IOException

Throws:: java.io.IOException

doSetNextReader

protected void doSetNextReader(LeafReaderContext context)
                        throws java.io.IOException

Throws:: java.io.IOException