public class FunctionAllGroupHeadsCollector extends AllGroupHeadsCollector<MutableValue>
AllGroupHeadsCollector for retrieving the most relevant groups when grouping
by ValueSource.| Modifier and Type | Class and Description |
|---|---|
class |
FunctionAllGroupHeadsCollector.FunctionGroupHead
Holds current head document for a single group.
|
AllGroupHeadsCollector.GroupHead<T>, AllGroupHeadsCollector.TemporalResultcompIDXEnd, 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.FunctionGroupHead> |
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
AllGroupHeadsCollector.temporalResult. |
void |
setScorer(Scorer scorer)
Called before successive calls to
LeafCollector.collect(int). |
collect, groupHeadsSize, retrieveGroupHeads, retrieveGroupHeadsgetLeafCollectorpublic 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
AllGroupHeadsCollectorAllGroupHeadsCollector.temporalResult.
If the group head wasn't encountered before then it will be added to the collected group heads.
The AllGroupHeadsCollector.TemporalResult.stop property will be true if the group head wasn't encountered before
otherwise false.
retrieveGroupHeadAndAddIfNotExist in class AllGroupHeadsCollector<MutableValue>doc - The document to retrieve the group head for.IOException - If I/O related errors occurprotected Collection<FunctionAllGroupHeadsCollector.FunctionGroupHead> getCollectedGroupHeads()
AllGroupHeadsCollectorgetCollectedGroupHeads in class AllGroupHeadsCollector<MutableValue>public void setScorer(Scorer scorer) throws IOException
LeafCollectorLeafCollector.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 LeafCollectorsetScorer in class SimpleCollectorIOExceptionprotected void doSetNextReader(LeafReaderContext context) throws IOException
SimpleCollectorcontext.doSetNextReader in class SimpleCollectorIOExceptionpublic boolean needsScores()
Collectortrue if scores are needed.