Package org.apache.lucene.index

Class CodecReader

java.lang.Object

org.apache.lucene.index.IndexReader

org.apache.lucene.index.LeafReader

org.apache.lucene.index.CodecReader

All Implemented Interfaces:

Closeable, AutoCloseable, Accountable

Direct Known Subclasses:

FilterCodecReader, SegmentReader

public abstract class CodecReader
extends LeafReader
implements Accountable

LeafReader implemented by codec APIs.

Nested Class Summary

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

IndexReader.CacheHelper, IndexReader.CacheKey, IndexReader.ClosedListener

Field Summary

Fields inherited from interface org.apache.lucene.util.Accountable

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CodecReader()	Sole constructor.

Method Summary

Modifier and Type	Method	Description
private void	checkBounds(int docID)
void	checkIntegrity()	Checks consistency of this reader.
protected void	doClose()	Implements close.
final void	document(int docID, StoredFieldVisitor visitor)	Expert: visits the fields of a stored document, for custom processing/loading of each field.
final BinaryDocValues	getBinaryDocValues(String field)	Returns BinaryDocValues for this field, or null if no binary doc values were indexed for this field.
Collection<Accountable>	getChildResources()	Returns nested resources of this class.
abstract DocValuesProducer	getDocValuesReader()	Expert: retrieve underlying DocValuesProducer
private FieldInfo	getDVField(String field, DocValuesType type)
abstract StoredFieldsReader	getFieldsReader()	Expert: retrieve thread-private StoredFieldsReader
abstract NormsProducer	getNormsReader()	Expert: retrieve underlying NormsProducer
final NumericDocValues	getNormValues(String field)	Returns NumericDocValues representing norms for this field, or null if no NumericDocValues were indexed.
final NumericDocValues	getNumericDocValues(String field)	Returns NumericDocValues for this field, or null if no numeric doc values were indexed for this field.
abstract PointsReader	getPointsReader()	Expert: retrieve underlying PointsReader
final PointValues	getPointValues(String field)	Returns the PointValues used for numeric or spatial searches for the given field, or null if there are no point fields.
abstract FieldsProducer	getPostingsReader()	Expert: retrieve underlying FieldsProducer
final SortedDocValues	getSortedDocValues(String field)	Returns SortedDocValues for this field, or null if no SortedDocValues were indexed for this field.
final SortedNumericDocValues	getSortedNumericDocValues(String field)	Returns SortedNumericDocValues for this field, or null if no SortedNumericDocValues were indexed for this field.
final SortedSetDocValues	getSortedSetDocValues(String field)	Returns SortedSetDocValues for this field, or null if no SortedSetDocValues were indexed for this field.
final Fields	getTermVectors(int docID)	Retrieve term vectors for this document, or null if term vectors were not indexed.
abstract TermVectorsReader	getTermVectorsReader()	Expert: retrieve thread-private TermVectorsReader
long	ramBytesUsed()	Return the memory usage of this object in bytes.
final Terms	terms(String field)	Returns the Terms index for this field, or null if it has none.

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

docFreq, getContext, getCoreCacheHelper, getDocCount, getFieldInfos, getLiveDocs, getMetaData, getSumDocFreq, getSumTotalTermFreq, postings, postings, totalTermFreq

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

close, decRef, document, document, ensureOpen, equals, getReaderCacheHelper, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, maxDoc, notifyReaderClosedListeners, numDeletedDocs, numDocs, registerParentReader, tryIncRef

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CodecReader

protected CodecReader()

Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Details

getFieldsReader

public abstract StoredFieldsReader getFieldsReader()

Expert: retrieve thread-private StoredFieldsReader

getTermVectorsReader

public abstract TermVectorsReader getTermVectorsReader()

Expert: retrieve thread-private TermVectorsReader

getNormsReader

public abstract NormsProducer getNormsReader()

Expert: retrieve underlying NormsProducer

getDocValuesReader

public abstract DocValuesProducer getDocValuesReader()

Expert: retrieve underlying DocValuesProducer

getPostingsReader

public abstract FieldsProducer getPostingsReader()

Expert: retrieve underlying FieldsProducer

getPointsReader

public abstract PointsReader getPointsReader()

Expert: retrieve underlying PointsReader

document

public final void document(int docID,
 StoredFieldVisitor visitor)
                    throws IOException

Description copied from class: IndexReader

Expert: visits the fields of a stored document, for custom processing/loading of each field. If you simply want to load all fields, use IndexReader.document(int). If you want to load a subset, use DocumentStoredFieldVisitor.

Specified by:

document in class IndexReader

Throws:

IOException

getTermVectors

public final Fields getTermVectors(int docID)
                            throws IOException

Description copied from class: IndexReader

Retrieve term vectors for this document, or null if term vectors were not indexed. The returned Fields instance acts like a single-document inverted index (the docID will be 0).

Specified by:

getTermVectors in class IndexReader

Throws:

IOException

checkBounds

private void checkBounds(int docID)

terms

public final Terms terms(String field)
                  throws IOException

Description copied from class: LeafReader

Returns the Terms index for this field, or null if it has none.

Specified by:

terms in class LeafReader

Throws:

IOException

getDVField

private FieldInfo getDVField(String field,
 DocValuesType type)

getNumericDocValues

public final NumericDocValues getNumericDocValues(String field)
                                           throws IOException

Description copied from class: LeafReader

Returns NumericDocValues for this field, or null if no numeric doc values were indexed for this field. The returned instance should only be used by a single thread.

Specified by:

getNumericDocValues in class LeafReader

Throws:

IOException

getBinaryDocValues

public final BinaryDocValues getBinaryDocValues(String field)
                                         throws IOException

Description copied from class: LeafReader

Returns BinaryDocValues for this field, or null if no binary doc values were indexed for this field. The returned instance should only be used by a single thread.

Specified by:

getBinaryDocValues in class LeafReader

Throws:

IOException

getSortedDocValues

public final SortedDocValues getSortedDocValues(String field)
                                         throws IOException

Description copied from class: LeafReader

Returns SortedDocValues for this field, or null if no SortedDocValues were indexed for this field. The returned instance should only be used by a single thread.

Specified by:

getSortedDocValues in class LeafReader

Throws:

IOException

getSortedNumericDocValues

public final SortedNumericDocValues getSortedNumericDocValues(String field)
                                                       throws IOException

Description copied from class: LeafReader

Returns SortedNumericDocValues for this field, or null if no SortedNumericDocValues were indexed for this field. The returned instance should only be used by a single thread.

Specified by:

getSortedNumericDocValues in class LeafReader

Throws:

IOException

getSortedSetDocValues

public final SortedSetDocValues getSortedSetDocValues(String field)
                                               throws IOException

Description copied from class: LeafReader

Returns SortedSetDocValues for this field, or null if no SortedSetDocValues were indexed for this field. The returned instance should only be used by a single thread.

Specified by:

getSortedSetDocValues in class LeafReader

Throws:

IOException

getNormValues

public final NumericDocValues getNormValues(String field)
                                     throws IOException

Description copied from class: LeafReader

Returns NumericDocValues representing norms for this field, or null if no NumericDocValues were indexed. The returned instance should only be used by a single thread.

Specified by:

getNormValues in class LeafReader

Throws:

IOException

getPointValues

public final PointValues getPointValues(String field)
                                 throws IOException

Description copied from class: LeafReader

Returns the PointValues used for numeric or spatial searches for the given field, or null if there are no point fields.

Specified by:

getPointValues in class LeafReader

Throws:

IOException

doClose

protected void doClose()
                throws IOException

Description copied from class: IndexReader

Implements close.

Specified by:

doClose in class IndexReader

Throws:

IOException

ramBytesUsed

public long ramBytesUsed()

Description copied from interface: Accountable

Return the memory usage of this object in bytes. Negative values are illegal.

Specified by:

ramBytesUsed in interface Accountable

getChildResources

public Collection<Accountable> getChildResources()

Description copied from interface: Accountable

Returns nested resources of this class. The result should be a point-in-time snapshot (to avoid race conditions).

Specified by:

getChildResources in interface Accountable

See Also:

• Accountables

checkIntegrity

public void checkIntegrity()
                    throws IOException

Description copied from class: LeafReader

Checks consistency of this reader.

Note that this may be costly in terms of I/O, e.g. may involve computing a checksum value against large data files.

Specified by:

checkIntegrity in class LeafReader

Throws:

IOException