Package org.apache.lucene.search

Class MultiCollectorManager

java.lang.Object

org.apache.lucene.search.MultiCollectorManager

All Implemented Interfaces:

CollectorManager<Collector,Object[]>

public class MultiCollectorManager
extends Object
implements CollectorManager<Collector,Object[]>

A CollectorManager implements which wrap a set of CollectorManager as MultiCollector acts for Collector.

Constructor Summary

Constructors

Constructor	Description
MultiCollectorManager(CollectorManager<? extends Collector,?>... collectorManagers)

Method Summary

Modifier and Type	Method	Description
Collector	newCollector()	Return a new Collector.
Object[]	reduce(Collection<Collector> reducableCollectors)	Reduce the results of individual collectors into a meaningful result.

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiCollectorManager

@SafeVarargs
public MultiCollectorManager(CollectorManager<? extends Collector,?>... collectorManagers)

Method Detail

newCollector

public Collector newCollector()
                       throws IOException

Description copied from interface: CollectorManager

Return a new Collector. This must return a different instance on each call.

Specified by:

newCollector in interface CollectorManager<Collector,Object[]>

Throws:

IOException

reduce

public Object[] reduce(Collection<Collector> reducableCollectors)
                throws IOException

Description copied from interface: CollectorManager

Reduce the results of individual collectors into a meaningful result. For instance a TopDocsCollector would compute the top docs of each collector and then merge them using TopDocs.merge(int, TopDocs[]). This method must be called after collection is finished on all provided collectors.

Specified by:

reduce in interface CollectorManager<Collector,Object[]>

Throws:

IOException