public class FunctionFirstPassGroupingCollector extends AbstractFirstPassGroupingCollector<MutableValue>
AbstractFirstPassGroupingCollector
that groups based on
ValueSource
instances.orderedGroups
Constructor and Description |
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FunctionFirstPassGroupingCollector(ValueSource groupByVS,
Map<?,?> vsContext,
Sort groupSort,
int topNGroups)
Creates a first pass collector.
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Modifier and Type | Method and Description |
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protected MutableValue |
copyDocGroupValue(MutableValue groupValue,
MutableValue reuse)
Returns a copy of the specified group value by creating a new instance and copying the value from the specified
groupValue in the new instance.
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protected MutableValue |
getDocGroupValue(int doc)
Returns the group value for the specified doc.
|
void |
setNextReader(AtomicReaderContext readerContext) |
acceptsDocsOutOfOrder, collect, getTopGroups, setScorer
public FunctionFirstPassGroupingCollector(ValueSource groupByVS, Map<?,?> vsContext, Sort groupSort, int topNGroups) throws IOException
groupByVS
- The ValueSource
instance to group byvsContext
- The ValueSource contextgroupSort
- The Sort
used to sort the
groups. The top sorted document within each group
according to groupSort, determines how that group
sorts against other groups. This must be non-null,
ie, if you want to groupSort by relevance use
Sort.RELEVANCE.topNGroups
- How many top groups to keep.IOException
- When I/O related errors occurprotected MutableValue getDocGroupValue(int doc)
AbstractFirstPassGroupingCollector
getDocGroupValue
in class AbstractFirstPassGroupingCollector<MutableValue>
doc
- The specified docprotected MutableValue copyDocGroupValue(MutableValue groupValue, MutableValue reuse)
AbstractFirstPassGroupingCollector
copyDocGroupValue
in class AbstractFirstPassGroupingCollector<MutableValue>
groupValue
- The group value to copyreuse
- Optionally a reuse instance to prevent a new instance creationpublic void setNextReader(AtomicReaderContext readerContext) throws IOException
setNextReader
in class AbstractFirstPassGroupingCollector<MutableValue>
IOException
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