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java.lang.Object org.apache.lucene.index.IndexReader org.apache.lucene.index.AtomicReader org.apache.lucene.index.SegmentReader
public final class SegmentReader
IndexReader implementation over a single segment.
Instances pointing to the same segment (but with different deletes, etc) may share the same core data.
Nested Class Summary | |
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static interface |
SegmentReader.CoreClosedListener
Called when the shared core for this SegmentReader is closed. |
Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader |
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IndexReader.ReaderClosedListener |
Constructor Summary | |
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SegmentReader(SegmentInfoPerCommit si,
int termInfosIndexDivisor,
IOContext context)
Constructs a new SegmentReader with a new core. |
Method Summary | |
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void |
addCoreClosedListener(SegmentReader.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. |
void |
document(int docID,
StoredFieldVisitor visitor)
Expert: visits the fields of a stored document, for custom processing/loading of each field. |
DocValues |
docValues(String field)
Returns DocValues for this field. |
Fields |
fields()
Returns Fields for this reader. |
Object |
getCombinedCoreAndDeletesKey()
Expert: Returns a key for this IndexReader that also includes deletions, so FieldCache/CachingWrapperFilter can find it again. |
Object |
getCoreCacheKey()
Expert: Returns a key for this IndexReader, so FieldCache/CachingWrapperFilter can find it again. |
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. |
String |
getSegmentName()
Return the name of the segment this reader is reading. |
int |
getTermInfosIndexDivisor()
Returns term infos index divisor originally passed to SegmentReader(SegmentInfoPerCommit, int, IOContext) . |
Fields |
getTermVectors(int docID)
Retrieve term vectors for this document, or null if term vectors were not indexed. |
TermVectorsReader |
getTermVectorsReader()
Expert: retrieve thread-private TermVectorsReader |
boolean |
hasDeletions()
Returns true if any documents have been deleted |
int |
maxDoc()
Returns one greater than the largest possible document number. |
DocValues |
normValues(String field)
Returns DocValues for this field's normalization values. |
int |
numDocs()
Returns the number of documents in this index. |
void |
removeCoreClosedListener(SegmentReader.CoreClosedListener listener)
Expert: removes a CoreClosedListener from this reader's shared core |
String |
toString()
|
Methods inherited from class org.apache.lucene.index.AtomicReader |
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docFreq, getContext, hasNorms, termDocsEnum, termPositionsEnum, terms, totalTermFreq |
Methods inherited from class org.apache.lucene.index.IndexReader |
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addReaderClosedListener, close, decRef, document, document, ensureOpen, equals, 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 SegmentReader(SegmentInfoPerCommit si, int termInfosIndexDivisor, IOContext context) throws IOException
CorruptIndexException
- if the index is corrupt
IOException
- if there is a low-level IO errorMethod Detail |
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public Bits getLiveDocs()
AtomicReader
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.
getLiveDocs
in class AtomicReader
protected void doClose() throws IOException
IndexReader
doClose
in class IndexReader
IOException
public boolean hasDeletions()
IndexReader
hasDeletions
in class IndexReader
public FieldInfos getFieldInfos()
AtomicReader
FieldInfos
describing all fields in
this reader.
getFieldInfos
in class AtomicReader
public StoredFieldsReader getFieldsReader()
StoredFieldsReader
public void document(int docID, StoredFieldVisitor visitor) throws IOException
IndexReader
IndexReader.document(int)
. If you want to load a subset, use
DocumentStoredFieldVisitor
.
document
in class IndexReader
IOException
public Fields fields()
AtomicReader
Fields
for this reader.
This method may return null if the reader has no
postings.
fields
in class AtomicReader
public int numDocs()
IndexReader
numDocs
in class IndexReader
public int maxDoc()
IndexReader
maxDoc
in class IndexReader
public TermVectorsReader getTermVectorsReader()
TermVectorsReader
public Fields getTermVectors(int docID) throws IOException
IndexReader
getTermVectors
in class IndexReader
IOException
public String toString()
toString
in class Object
public String getSegmentName()
public Directory directory()
public Object getCoreCacheKey()
IndexReader
getCoreCacheKey
in class IndexReader
public Object getCombinedCoreAndDeletesKey()
IndexReader
getCombinedCoreAndDeletesKey
in class IndexReader
public int getTermInfosIndexDivisor()
SegmentReader(SegmentInfoPerCommit, int, IOContext)
.
public DocValues docValues(String field) throws IOException
AtomicReader
DocValues
for this field.
This method may return null if the reader has no per-document
values stored.
docValues
in class AtomicReader
IOException
public DocValues normValues(String field) throws IOException
AtomicReader
DocValues
for this field's normalization values.
This method may return null if the field has no norms.
normValues
in class AtomicReader
IOException
public void addCoreClosedListener(SegmentReader.CoreClosedListener listener)
public void removeCoreClosedListener(SegmentReader.CoreClosedListener listener)
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