Package org.apache.lucene.search

Class MultiCollectorManager

java.lang.Object

org.apache.lucene.search.MultiCollectorManager

All Implemented Interfaces:

CollectorManager<MultiCollectorManager.Collectors,Object[]>

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

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	MultiCollectorManager.Collectors

Field Summary

Fields

Modifier and Type	Field	Description
private final CollectorManager<Collector,?>[]	collectorManagers

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
MultiCollectorManager.Collectors	newCollector()	Return a new Collector.
Object[]	reduce(Collection<MultiCollectorManager.Collectors> 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

Field Details

collectorManagers

private final CollectorManager<Collector,?>[] collectorManagers

Constructor Details

MultiCollectorManager

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

Method Details

newCollector

public MultiCollectorManager.Collectors 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<MultiCollectorManager.Collectors,Object[]>

Throws:

IOException

reduce

public Object[] reduce(Collection<MultiCollectorManager.Collectors> 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<MultiCollectorManager.Collectors,Object[]>

Throws:

IOException