org.apache.lucene.search.grouping.function

Class FunctionDistinctValuesCollector

java.lang.Object

org.apache.lucene.search.SimpleCollector

org.apache.lucene.search.grouping.AbstractDistinctValuesCollector<FunctionDistinctValuesCollector.GroupCount>

org.apache.lucene.search.grouping.function.FunctionDistinctValuesCollector

All Implemented Interfaces:

Collector, LeafCollector

public class FunctionDistinctValuesCollector
extends AbstractDistinctValuesCollector<FunctionDistinctValuesCollector.GroupCount>

Function based implementation of AbstractDistinctValuesCollector.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FunctionDistinctValuesCollector.GroupCount Holds distinct values for a single group.

Field Summary

Fields

Modifier and Type	Field and Description
private FunctionValues.ValueFiller	countFiller
private MutableValue	countMval
private ValueSource	countSource
private FunctionValues.ValueFiller	groupFiller
private java.util.Map<MutableValue,FunctionDistinctValuesCollector.GroupCount>	groupMap
private MutableValue	groupMval
private ValueSource	groupSource
private java.util.Map<?,?>	vsContext

Constructor Summary

Constructors

Constructor and Description
FunctionDistinctValuesCollector(java.util.Map<?,?> vsContext, ValueSource groupSource, ValueSource countSource, java.util.Collection<SearchGroup<MutableValue>> groups)

Method Summary

Modifier and Type	Method and Description
void	collect(int doc) Called once for every document matching a query, with the unbased document number.
protected void	doSetNextReader(LeafReaderContext context) This method is called before collecting context.
java.util.List<FunctionDistinctValuesCollector.GroupCount>	getGroups() Returns all unique values for each top N group.

Methods inherited from class org.apache.lucene.search.grouping.AbstractDistinctValuesCollector

needsScores

Methods inherited from class org.apache.lucene.search.SimpleCollector

getLeafCollector, setScorer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

vsContext

private final java.util.Map<?,?> vsContext

groupSource

private final ValueSource groupSource

countSource

private final ValueSource countSource

groupMap

private final java.util.Map<MutableValue,FunctionDistinctValuesCollector.GroupCount> groupMap

groupFiller

private FunctionValues.ValueFiller groupFiller

countFiller

private FunctionValues.ValueFiller countFiller

groupMval

private MutableValue groupMval

countMval

private MutableValue countMval

Constructor Detail

FunctionDistinctValuesCollector

public FunctionDistinctValuesCollector(java.util.Map<?,?> vsContext,
                                       ValueSource groupSource,
                                       ValueSource countSource,
                                       java.util.Collection<SearchGroup<MutableValue>> groups)

Method Detail

getGroups

public java.util.List<FunctionDistinctValuesCollector.GroupCount> getGroups()

Description copied from class: AbstractDistinctValuesCollector

Returns all unique values for each top N group.

Specified by:

getGroups in class AbstractDistinctValuesCollector<FunctionDistinctValuesCollector.GroupCount>

Returns:

all unique values for each top N group

collect

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

Description copied from interface: LeafCollector

Called once for every document matching a query, with the unbased document number.

Note: The collection of the current segment can be terminated by throwing a CollectionTerminatedException. In this case, the last docs of the current LeafReaderContext will be skipped and IndexSearcher will swallow the exception and continue collection with the next leaf.

Note: This is called in an inner search loop. For good search performance, implementations of this method should not call IndexSearcher.doc(int) or IndexReader.document(int) on every hit. Doing so can slow searches by an order of magnitude or more.

Specified by:

collect in interface LeafCollector

Specified by:

collect in class SimpleCollector

Throws:

java.io.IOException

doSetNextReader

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

Description copied from class: SimpleCollector

This method is called before collecting context.

Overrides:

doSetNextReader in class SimpleCollector

Throws:

java.io.IOException