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java.lang.Object org.apache.lucene.index.IndexReader org.apache.lucene.index.CompositeReader org.apache.lucene.index.BaseCompositeReader<IndexReader> org.apache.lucene.index.MultiReader
public class MultiReader
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.
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader |
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IndexReader.ReaderClosedListener |
Constructor Summary | |
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MultiReader(IndexReader... subReaders)
Construct a MultiReader aggregating the named set of (sub)readers. |
|
MultiReader(IndexReader[] subReaders,
boolean closeSubReaders)
Construct a MultiReader aggregating the named set of (sub)readers. |
Method Summary | |
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protected void |
doClose()
Implements close. |
Methods inherited from class org.apache.lucene.index.BaseCompositeReader |
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docFreq, document, getSequentialSubReaders, getTermVectors, hasDeletions, maxDoc, numDocs, readerBase, readerIndex, totalTermFreq |
Methods inherited from class org.apache.lucene.index.CompositeReader |
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getContext, toString |
Methods inherited from class org.apache.lucene.index.IndexReader |
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addReaderClosedListener, close, decRef, document, document, ensureOpen, equals, getCombinedCoreAndDeletesKey, getCoreCacheKey, getRefCount, getTermVector, hashCode, incRef, leaves, numDeletedDocs, open, open, open, open, open, registerParentReader, removeReaderClosedListener, tryIncRef |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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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.
subReaders
- set of (sub)readerspublic MultiReader(IndexReader[] subReaders, boolean closeSubReaders)
Construct a MultiReader aggregating the named set of (sub)readers.
subReaders
- set of (sub)readers; this array will be cloned.closeSubReaders
- indicates whether the subreaders should be closed
when this MultiReader is closedMethod Detail |
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protected void doClose() throws IOException
IndexReader
doClose
in class IndexReader
IOException
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