org.apache.lucene.index

Class FilterCodecReader

java.lang.Object

org.apache.lucene.index.IndexReader

org.apache.lucene.index.LeafReader

org.apache.lucene.index.CodecReader

org.apache.lucene.index.FilterCodecReader

All Implemented Interfaces:

Closeable, AutoCloseable, Accountable

Direct Known Subclasses:

SortingCodecReader

public abstract class FilterCodecReader
extends CodecReader

A FilterCodecReader contains another CodecReader, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.

NOTE: If this FilterCodecReader does not change the content the contained reader, you could consider delegating calls to LeafReader.getCoreCacheHelper() and IndexReader.getReaderCacheHelper().

Nested Class Summary

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

IndexReader.CacheHelper, IndexReader.CacheKey, IndexReader.ClosedListener

Field Summary

Fields

Modifier and Type	Field and Description
protected CodecReader	in The underlying CodecReader instance.

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

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Constructor and Description
FilterCodecReader(CodecReader in) Creates a new FilterCodecReader.

Method Summary

Modifier and Type	Method and Description
void	checkIntegrity() Checks consistency of this reader.
protected void	doClose() Implements close.
Collection<Accountable>	getChildResources() Returns nested resources of this class.
CodecReader	getDelegate() Returns the wrapped CodecReader.
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.
LeafMetaData	getMetaData() Return metadata about this leaf.
NormsProducer	getNormsReader() Expert: retrieve underlying NormsProducer
PointsReader	getPointsReader() Expert: retrieve underlying PointsReader
FieldsProducer	getPostingsReader() Expert: retrieve underlying FieldsProducer
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.
long	ramBytesUsed() Return the memory usage of this object in bytes.
static CodecReader	unwrap(CodecReader reader) Get the wrapped instance by reader as long as this reader is an instance of FilterCodecReader.

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

document, getBinaryDocValues, getNormValues, getNumericDocValues, getPointValues, getSortedDocValues, getSortedNumericDocValues, getSortedSetDocValues, getTermVectors, terms

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

docFreq, getContext, getCoreCacheHelper, getDocCount, 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, numDeletedDocs, registerParentReader, tryIncRef

Methods inherited from class java.lang.Object

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

Field Detail

in

protected final CodecReader in

The underlying CodecReader instance.

Constructor Detail

FilterCodecReader

public FilterCodecReader(CodecReader in)

Creates a new FilterCodecReader.

Parameters:

in - the underlying CodecReader instance.

Method Detail

unwrap

public static CodecReader unwrap(CodecReader reader)

Get the wrapped instance by reader as long as this reader is an instance of FilterCodecReader.

getFieldsReader

public StoredFieldsReader getFieldsReader()

Description copied from class: CodecReader

Expert: retrieve thread-private StoredFieldsReader

Specified by:

getFieldsReader in class CodecReader

getTermVectorsReader

public TermVectorsReader getTermVectorsReader()

Description copied from class: CodecReader

Expert: retrieve thread-private TermVectorsReader

Specified by:

getTermVectorsReader 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

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

getFieldInfos

public FieldInfos getFieldInfos()

Description copied from class: LeafReader

Get the FieldInfos describing all fields in this reader. Note: Implementations should cache the FieldInfos instance returned by this method such that subsequent calls to this method return the same instance.

Specified by:

getFieldInfos in class LeafReader

getPointsReader

public PointsReader getPointsReader()

Description copied from class: CodecReader

Expert: retrieve underlying PointsReader

Specified by:

getPointsReader in class CodecReader

numDocs

public int numDocs()

Description copied from class: IndexReader

Returns the number of documents in this index.

NOTE: This operation may run in O(maxDoc). Implementations that can't return this number in constant-time should cache it.

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

getMetaData

public LeafMetaData getMetaData()

Description copied from class: LeafReader

Return metadata about this leaf.

Specified by:

getMetaData in class LeafReader

doClose

protected void doClose()
                throws IOException

Description copied from class: IndexReader

Implements close.

Overrides:

doClose in class CodecReader

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

Overrides:

ramBytesUsed in class CodecReader

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

Overrides:

getChildResources in class CodecReader

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.

Overrides:

checkIntegrity in class CodecReader

Throws:

IOException

getDelegate

public CodecReader getDelegate()

Returns the wrapped CodecReader.