public class FunctionAllGroupHeadsCollector extends AbstractAllGroupHeadsCollector<FunctionAllGroupHeadsCollector.GroupHead>
AbstractAllGroupHeadsCollector
for retrieving the most relevant groups when grouping
by ValueSource
.Modifier and Type | Class and Description |
---|---|
class |
FunctionAllGroupHeadsCollector.GroupHead
Holds current head document for a single group.
|
AbstractAllGroupHeadsCollector.TemporalResult
compIDXEnd, reversed, temporalResult
Constructor and Description |
---|
FunctionAllGroupHeadsCollector(ValueSource groupBy,
Map<?,?> vsContext,
Sort sortWithinGroup)
Constructs a
FunctionAllGroupHeadsCollector instance. |
Modifier and Type | Method and Description |
---|---|
protected void |
doSetNextReader(LeafReaderContext context)
This method is called before collecting
context . |
protected Collection<FunctionAllGroupHeadsCollector.GroupHead> |
getCollectedGroupHeads()
Returns the collected group heads.
|
boolean |
needsScores()
Indicates if document scores are needed by this collector.
|
protected void |
retrieveGroupHeadAndAddIfNotExist(int doc)
Returns the group head and puts it into
AbstractAllGroupHeadsCollector.temporalResult . |
void |
setScorer(Scorer scorer)
Called before successive calls to
LeafCollector.collect(int) . |
collect, groupHeadsSize, retrieveGroupHeads, retrieveGroupHeads
getLeafCollector
public FunctionAllGroupHeadsCollector(ValueSource groupBy, Map<?,?> vsContext, Sort sortWithinGroup)
FunctionAllGroupHeadsCollector
instance.groupBy
- The ValueSource
to group byvsContext
- The ValueSource contextsortWithinGroup
- The sort within a groupprotected void retrieveGroupHeadAndAddIfNotExist(int doc) throws IOException
AbstractAllGroupHeadsCollector
AbstractAllGroupHeadsCollector.temporalResult
.
If the group head wasn't encountered before then it will be added to the collected group heads.
The AbstractAllGroupHeadsCollector.TemporalResult.stop
property will be true
if the group head wasn't encountered before
otherwise false
.
retrieveGroupHeadAndAddIfNotExist
in class AbstractAllGroupHeadsCollector<FunctionAllGroupHeadsCollector.GroupHead>
doc
- The document to retrieve the group head for.IOException
- If I/O related errors occurprotected Collection<FunctionAllGroupHeadsCollector.GroupHead> getCollectedGroupHeads()
AbstractAllGroupHeadsCollector
getCollectedGroupHeads
in class AbstractAllGroupHeadsCollector<FunctionAllGroupHeadsCollector.GroupHead>
public void setScorer(Scorer scorer) throws IOException
LeafCollector
LeafCollector.collect(int)
. Implementations
that need the score of the current document (passed-in to
LeafCollector.collect(int)
), should save the passed-in Scorer and call
scorer.score() when needed.setScorer
in interface LeafCollector
setScorer
in class SimpleCollector
IOException
protected void doSetNextReader(LeafReaderContext context) throws IOException
SimpleCollector
context
.doSetNextReader
in class SimpleCollector
IOException
public boolean needsScores()
Collector
true
if scores are needed.Copyright © 2000–2015 The Apache Software Foundation. All rights reserved.