org.apache.lucene.index

Class SegmentReader

java.lang.Object

org.apache.lucene.index.IndexReader

org.apache.lucene.index.LeafReader

org.apache.lucene.index.CodecReader

org.apache.lucene.index.SegmentReader

All Implemented Interfaces:

Closeable, AutoCloseable, Accountable

public final class SegmentReader
extends CodecReader

IndexReader implementation over a single segment.

Instances pointing to the same segment (but with different deletes, etc) may share the same core data.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.LeafReader

LeafReader.CoreClosedListener

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

IndexReader.ReaderClosedListener

Constructor Summary

Constructors

Constructor and Description
SegmentReader(SegmentCommitInfo si, IOContext context) Constructs a new SegmentReader with a new core.

Method Summary

Methods

Modifier and Type	Method and Description
void	addCoreClosedListener(LeafReader.CoreClosedListener listener) Expert: adds a CoreClosedListener to this reader's shared core
Directory	directory() Returns the directory this index resides in.
protected void	doClose() Implements close.
Object	getCombinedCoreAndDeletesKey() Expert: Returns a key for this IndexReader that also includes deletions, so CachingWrapperFilter can find it again.
Object	getCoreCacheKey() Expert: Returns a key for this IndexReader, so CachingWrapperFilter can find it again.
DocValuesProducer	getDocValuesReader() Expert: retrieve underlying DocValuesProducer
FieldInfos	getFieldInfos() Get the FieldInfos describing all fields in this reader.
StoredFieldsReader	getFieldsReader() Expert: retrieve thread-private StoredFieldsReader
Bits	getLiveDocs() Returns the Bits representing live (not deleted) docs.
NormsProducer	getNormsReader() Expert: retrieve underlying NormsProducer
FieldsProducer	getPostingsReader() Expert: retrieve underlying FieldsProducer
SegmentCommitInfo	getSegmentInfo() Return the SegmentInfoPerCommit of the segment this reader is reading.
String	getSegmentName() Return the name of the segment this reader is reading.
TermVectorsReader	getTermVectorsReader() Expert: retrieve thread-private TermVectorsReader
int	maxDoc() Returns one greater than the largest possible document number.
int	numDocs() Returns the number of documents in this index.
void	removeCoreClosedListener(LeafReader.CoreClosedListener listener) Expert: removes a CoreClosedListener from this reader's shared core
String	toString()

Methods inherited from class org.apache.lucene.index.CodecReader

checkIntegrity, document, fields, getBinaryDocValues, getChildResources, getDocsWithField, getNormValues, getNumericDocValues, getSortedDocValues, getSortedNumericDocValues, getSortedSetDocValues, getTermVectors, ramBytesUsed

Methods inherited from class org.apache.lucene.index.LeafReader

addCoreClosedListenerAsReaderClosedListener, docFreq, getContext, getDocCount, getSumDocFreq, getSumTotalTermFreq, postings, postings, removeCoreClosedListenerAsReaderClosedListener, termDocsEnum, termPositionsEnum, terms, totalTermFreq

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

SegmentReader

public SegmentReader(SegmentCommitInfo si,
             IOContext context)
              throws IOException

Constructs a new SegmentReader with a new core.

Throws:

CorruptIndexException - if the index is corrupt

IOException - if there is a low-level IO error

Method Detail

getLiveDocs

public Bits getLiveDocs()

Description copied from class: LeafReader

Returns the Bits representing live (not deleted) docs. A set bit indicates the doc ID has not been deleted. If this method returns null it means there are no deleted documents (all documents are live). The returned instance has been safely published for use by multiple threads without additional synchronization.

Specified by:

getLiveDocs in class LeafReader

doClose

protected void doClose()
                throws IOException

Description copied from class: IndexReader

Implements close.

Overrides:

doClose in class CodecReader

Throws:

IOException

getFieldInfos

public FieldInfos getFieldInfos()

Description copied from class: LeafReader

Get the FieldInfos describing all fields in this reader.

Specified by:

getFieldInfos in class LeafReader

numDocs

public int numDocs()

Description copied from class: IndexReader

Returns the number of documents in this index.

Specified by:

numDocs in class IndexReader

maxDoc

public int maxDoc()

Description copied from class: IndexReader

Returns one greater than the largest possible document number. This may be used to, e.g., determine how big to allocate an array which will have an element for every document number in an index.

Specified by:

maxDoc in class IndexReader

getTermVectorsReader

public TermVectorsReader getTermVectorsReader()

Description copied from class: CodecReader

Expert: retrieve thread-private TermVectorsReader

Specified by:

getTermVectorsReader in class CodecReader

getFieldsReader

public StoredFieldsReader getFieldsReader()

Description copied from class: CodecReader

Expert: retrieve thread-private StoredFieldsReader

Specified by:

getFieldsReader in class CodecReader

getNormsReader

public NormsProducer getNormsReader()

Description copied from class: CodecReader

Expert: retrieve underlying NormsProducer

Specified by:

getNormsReader in class CodecReader

getDocValuesReader

public DocValuesProducer getDocValuesReader()

Description copied from class: CodecReader

Expert: retrieve underlying DocValuesProducer

Specified by:

getDocValuesReader in class CodecReader

getPostingsReader

public FieldsProducer getPostingsReader()

Description copied from class: CodecReader

Expert: retrieve underlying FieldsProducer

Specified by:

getPostingsReader in class CodecReader

toString

public String toString()

Overrides:

toString in class Object

getSegmentName

public String getSegmentName()

Return the name of the segment this reader is reading.

getSegmentInfo

public SegmentCommitInfo getSegmentInfo()

Return the SegmentInfoPerCommit of the segment this reader is reading.

directory

public Directory directory()

Returns the directory this index resides in.

getCoreCacheKey

public Object getCoreCacheKey()

Description copied from class: IndexReader

Expert: Returns a key for this IndexReader, so CachingWrapperFilter can find it again. This key must not have equals()/hashCode() methods, so "equals" means "identical".

Overrides:

getCoreCacheKey in class IndexReader

getCombinedCoreAndDeletesKey

public Object getCombinedCoreAndDeletesKey()

Description copied from class: IndexReader

Expert: Returns a key for this IndexReader that also includes deletions, so CachingWrapperFilter can find it again. This key must not have equals()/hashCode() methods, so "equals" means "identical".

Overrides:

getCombinedCoreAndDeletesKey in class IndexReader

addCoreClosedListener

public void addCoreClosedListener(LeafReader.CoreClosedListener listener)

Description copied from class: LeafReader

Expert: adds a CoreClosedListener to this reader's shared core

Specified by:

addCoreClosedListener in class LeafReader

removeCoreClosedListener

public void removeCoreClosedListener(LeafReader.CoreClosedListener listener)

Description copied from class: LeafReader

Expert: removes a CoreClosedListener from this reader's shared core

Specified by:

removeCoreClosedListener in class LeafReader