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 Details

### MultiCollectorManager

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

## Method Details

### 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`