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 and Description
    --- | ---
    `class` | `MultiCollectorManager.Collectors`

  - ### Constructor Summary

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

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and 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`

- - ### Constructor Detail

    - #### MultiCollectorManager

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

  - ### Method Detail

    - #### 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`

Copyright © 2000-2021 Apache Software Foundation. All Rights Reserved.