Package org.apache.lucene.index

Class MultiReader

java.lang.Object
org.apache.lucene.index.IndexReader
org.apache.lucene.index.CompositeReader
org.apache.lucene.index.BaseCompositeReader<IndexReader>
org.apache.lucene.index.MultiReader
All Implemented Interfaces:
Closeable, AutoCloseable
public class MultiReader extends BaseCompositeReader<IndexReader>
A CompositeReader which reads multiple indexes, appending their content. It can be used to create a view on several sub-readers (like DirectoryReader) and execute searches on it.

For efficiency, in this API documents are often referred to via document numbers, non-negative integers which each name a unique document in the index. These document numbers are ephemeral -- they may change as documents are added to and deleted from an index. Clients should thus not rely on a given document having the same number between sessions.

NOTE: IndexReader instances are completely thread safe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should not synchronize on the IndexReader instance; use your own (non-Lucene) objects instead.

  • Constructor Details

    • MultiReader

      public MultiReader(IndexReader... subReaders)

      Construct a MultiReader aggregating the named set of (sub)readers.

      Note that all subreaders are closed if this Multireader is closed.

      Parameters:
      subReaders - set of (sub)readers

    • MultiReader

      public MultiReader(IndexReader[] subReaders, boolean closeSubReaders)

      Construct a MultiReader aggregating the named set of (sub)readers.

      Parameters:
      subReaders - set of (sub)readers; this array will be cloned.
      closeSubReaders - indicates whether the subreaders should be closed when this MultiReader is closed

  • Method Details