Module org.apache.lucene.backward_codecs

Package org.apache.lucene.backward_codecs.lucene99

Class Lucene99PostingsReader

java.lang.Object

org.apache.lucene.codecs.PostingsReaderBase

org.apache.lucene.backward_codecs.lucene99.Lucene99PostingsReader

All Implemented Interfaces:

Closeable, AutoCloseable

public final class Lucene99PostingsReader
extends PostingsReaderBase

Concrete class that reads docId(maybe frq,pos,offset,payloads) list with postings format.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) final class	Lucene99PostingsReader.BlockDocsEnum
(package private) final class	Lucene99PostingsReader.BlockImpactsDocsEnum
(package private) final class	Lucene99PostingsReader.BlockImpactsEverythingEnum
(package private) final class	Lucene99PostingsReader.BlockImpactsPostingsEnum
(package private) final class	Lucene99PostingsReader.EverythingEnum

Field Summary

Fields

Modifier and Type	Field	Description
private final IndexInput	docIn
private static final int	MAX_POSTINGS_SIZE_FOR_FULL_PREFETCH	Maximum byte size of a postings list to be fully prefetched.
private final IndexInput	payIn
private final IndexInput	posIn
private final int	version

Constructor Summary

Constructors

Constructor	Description
Lucene99PostingsReader(SegmentReadState state)	Sole constructor.

Method Summary

Modifier and Type	Method	Description
void	checkIntegrity()	Checks consistency of this reader.
void	close()
void	decodeTerm(DataInput in, FieldInfo fieldInfo, BlockTermState _termState, boolean absolute)	Actually decode metadata for next term
(package private) static int	findFirstGreater(long[] buffer, int target, int from)
ImpactsEnum	impacts(FieldInfo fieldInfo, BlockTermState state, int flags)	Return a ImpactsEnum that computes impacts with scorer.
void	init(IndexInput termsIn, SegmentReadState state)	Performs any initialization, such as reading and verifying the header from the provided terms dictionary IndexInput.
BlockTermState	newTermState()	Return a newly created empty TermState
PostingsEnum	postings(FieldInfo fieldInfo, BlockTermState termState, PostingsEnum reuse, int flags)	Must fully consume state, since after this call that TermState may be reused.
private void	prefetchSkipData(IndexInput docIn, long docStartFP, long skipOffset)
(package private) static void	prefixSum(long[] buffer, int count, long base)
private void	seekAndPrefetchPostings(IndexInput docIn, Lucene99PostingsFormat.IntBlockTermState state)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

MAX_POSTINGS_SIZE_FOR_FULL_PREFETCH

private static final int MAX_POSTINGS_SIZE_FOR_FULL_PREFETCH

Maximum byte size of a postings list to be fully prefetched.

See Also:

• Constant Field Values

docIn

private final IndexInput docIn

posIn

private final IndexInput posIn

payIn

private final IndexInput payIn

version

private final int version

Constructor Details

Lucene99PostingsReader

public Lucene99PostingsReader(SegmentReadState state)
                       throws IOException

Sole constructor.

Throws:

IOException

Method Details

init

public void init(IndexInput termsIn,
 SegmentReadState state)
          throws IOException

Description copied from class: PostingsReaderBase

Performs any initialization, such as reading and verifying the header from the provided terms dictionary IndexInput.

Specified by:

init in class PostingsReaderBase

Throws:

IOException

prefixSum

static void prefixSum(long[] buffer,
 int count,
 long base)

findFirstGreater

static int findFirstGreater(long[] buffer,
 int target,
 int from)

newTermState

public BlockTermState newTermState()

Description copied from class: PostingsReaderBase

Return a newly created empty TermState

Specified by:

newTermState in class PostingsReaderBase

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class PostingsReaderBase

Throws:

IOException

decodeTerm

public void decodeTerm(DataInput in,
 FieldInfo fieldInfo,
 BlockTermState _termState,
 boolean absolute)
                throws IOException

Description copied from class: PostingsReaderBase

Actually decode metadata for next term

Specified by:

decodeTerm in class PostingsReaderBase

Throws:

IOException

See Also:

• PostingsWriterBase.encodeTerm(org.apache.lucene.store.DataOutput, org.apache.lucene.index.FieldInfo, org.apache.lucene.codecs.BlockTermState, boolean)

postings

public PostingsEnum postings(FieldInfo fieldInfo,
 BlockTermState termState,
 PostingsEnum reuse,
 int flags)
                      throws IOException

Description copied from class: PostingsReaderBase

Must fully consume state, since after this call that TermState may be reused.

Specified by:

postings in class PostingsReaderBase

Throws:

IOException

impacts

public ImpactsEnum impacts(FieldInfo fieldInfo,
 BlockTermState state,
 int flags)
                    throws IOException

Description copied from class: PostingsReaderBase

Return a ImpactsEnum that computes impacts with scorer.

Specified by:

impacts in class PostingsReaderBase

Throws:

IOException

See Also:

• PostingsReaderBase.postings(FieldInfo, BlockTermState, PostingsEnum, int)

seekAndPrefetchPostings

private void seekAndPrefetchPostings(IndexInput docIn,
 Lucene99PostingsFormat.IntBlockTermState state)
                              throws IOException

Throws:

IOException

prefetchSkipData

private void prefetchSkipData(IndexInput docIn,
 long docStartFP,
 long skipOffset)
                       throws IOException

Throws:

IOException

checkIntegrity

public void checkIntegrity()
                    throws IOException

Description copied from class: PostingsReaderBase

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 PostingsReaderBase

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object