org.apache.lucene.facet.search.aggregator

Class CountingAggregator

java.lang.Object

org.apache.lucene.facet.search.aggregator.CountingAggregator

All Implemented Interfaces:

Aggregator

Direct Known Subclasses:

ComplementCountingAggregator

public class CountingAggregator
extends Object
implements Aggregator

A CountingAggregator updates a counter array with the size of the whole taxonomy, counting the number of times each category appears in the given set of documents.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field and Description
protected int[]	counterArray

Constructor Summary

Constructors

Constructor and Description
CountingAggregator(int[] counterArray)

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(int docID, float score, IntsRef ordinals) Aggregate the ordinals of the given document ID (and its score).
boolean	equals(Object obj)
int	hashCode()
boolean	setNextReader(AtomicReaderContext context) Sets the AtomicReaderContext for which Aggregator.aggregate(int, float, IntsRef) calls will be made.

Methods inherited from class java.lang.Object

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

Field Detail

counterArray

protected int[] counterArray

Constructor Detail

CountingAggregator

public CountingAggregator(int[] counterArray)

Method Detail

aggregate

public void aggregate(int docID,
             float score,
             IntsRef ordinals)
               throws IOException

Description copied from interface: Aggregator

Aggregate the ordinals of the given document ID (and its score). The given ordinals offset is always zero.

Specified by:

aggregate in interface Aggregator

Throws:

IOException

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

setNextReader

public boolean setNextReader(AtomicReaderContext context)
                      throws IOException

Description copied from interface: Aggregator

Sets the AtomicReaderContext for which Aggregator.aggregate(int, float, IntsRef) calls will be made. If this method returns false, Aggregator.aggregate(int, float, IntsRef) should not be called for this reader.

Specified by:

setNextReader in interface Aggregator

Throws:

IOException