org.apache.lucene.search

## Class QueryUtils.FCInvisibleMultiReader

- java.lang.Object
- - org.apache.lucene.index.IndexReader
  - - org.apache.lucene.index.CompositeReader
    - - org.apache.lucene.index.BaseCompositeReader<IndexReader>
      - - org.apache.lucene.index.MultiReader
        - - org.apache.lucene.search.QueryUtils.FCInvisibleMultiReader

- All Implemented Interfaces:
    Closeable, AutoCloseable
  Enclosing class:
    QueryUtils

      public static class QueryUtils.FCInvisibleMultiReader
      extends MultiReader

  This is a MultiReader that can be used for randomly wrapping other readers without creating FieldCache insanity. The trick is to use an opaque/fake cache key.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader

      `IndexReader.ReaderClosedListener`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FCInvisibleMultiReader(IndexReader... readers)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `getCombinedCoreAndDeletesKey()`
    `Object` | `getCoreCacheKey()`

    - ### Methods inherited from class org.apache.lucene.index.MultiReader

      `doClose`

    - ### Methods inherited from class org.apache.lucene.index.BaseCompositeReader

      `docFreq, document, getDocCount, getSequentialSubReaders, getSumDocFreq, getSumTotalTermFreq, getTermVectors, maxDoc, numDocs, readerBase, readerIndex, totalTermFreq`

    - ### Methods inherited from class org.apache.lucene.index.CompositeReader

      `getContext, toString`

    - ### Methods inherited from class org.apache.lucene.index.IndexReader

      `addReaderClosedListener, close, decRef, document, document, ensureOpen, equals, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, numDeletedDocs, registerParentReader, removeReaderClosedListener, tryIncRef`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### FCInvisibleMultiReader

          public FCInvisibleMultiReader(IndexReader... readers)
                                 throws IOException

      Throws:
        `IOException`

  - ### Method Detail

    - #### getCoreCacheKey

          public Object getCoreCacheKey()

      Overrides:
        `getCoreCacheKey` in class `IndexReader`

    - #### getCombinedCoreAndDeletesKey

          public Object getCombinedCoreAndDeletesKey()

      Overrides:
        `getCombinedCoreAndDeletesKey` in class `IndexReader`

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