Module org.apache.lucene.backward_codecs

Package org.apache.lucene.backward_codecs.lucene912

Class Lucene912PostingsReader

java.lang.Object

org.apache.lucene.codecs.PostingsReaderBase

org.apache.lucene.backward_codecs.lucene912.Lucene912PostingsReader

All Implemented Interfaces:

Closeable, AutoCloseable

public final class Lucene912PostingsReader
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
private class	Lucene912PostingsReader.AbstractPostingsEnum
(package private) final class	Lucene912PostingsReader.BlockDocsEnum
(package private) final class	Lucene912PostingsReader.BlockImpactsDocsEnum
private class	Lucene912PostingsReader.BlockImpactsEnum
(package private) final class	Lucene912PostingsReader.BlockImpactsPostingsEnum
(package private) final class	Lucene912PostingsReader.EverythingEnum
(package private) static class	Lucene912PostingsReader.MutableImpactList

Field Summary

Fields

Modifier and Type	Field	Description
private final IndexInput	docIn
private static final List<Impact>	DUMMY_IMPACTS
private final int	maxImpactNumBytesAtLevel0
private final int	maxImpactNumBytesAtLevel1
private final int	maxNumImpactsAtLevel0
private final int	maxNumImpactsAtLevel1
private final IndexInput	payIn
private final IndexInput	posIn

Constructor Summary

Constructors

Constructor	Description
Lucene912PostingsReader(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
private static int	findNextGEQ(long[] buffer, long target, int from, int to)
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 static void	prefetchPostings(IndexInput docIn, Lucene912PostingsFormat.IntBlockTermState state)
(package private) static void	prefixSum(long[] buffer, int count, long base)
(package private) static Lucene912PostingsReader.MutableImpactList	readImpacts(ByteArrayDataInput in, Lucene912PostingsReader.MutableImpactList reuse)
(package private) static int	readVInt15(DataInput in)
(package private) static long	readVLong15(DataInput in)
private static long	sumOverRange(long[] arr, int start, int end)
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

DUMMY_IMPACTS

private static final List<Impact> DUMMY_IMPACTS

docIn

private final IndexInput docIn

posIn

private final IndexInput posIn

payIn

private final IndexInput payIn

maxNumImpactsAtLevel0

private final int maxNumImpactsAtLevel0

maxImpactNumBytesAtLevel0

private final int maxImpactNumBytesAtLevel0

maxNumImpactsAtLevel1

private final int maxNumImpactsAtLevel1

maxImpactNumBytesAtLevel1

private final int maxImpactNumBytesAtLevel1

Constructor Details

Lucene912PostingsReader

public Lucene912PostingsReader(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)

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)

sumOverRange

private static long sumOverRange(long[] arr,
 int start,
 int end)

readVInt15

static int readVInt15(DataInput in)
               throws IOException

Throws:

IOException

readVLong15

static long readVLong15(DataInput in)
                 throws IOException

Throws:

IOException

findNextGEQ

private static int findNextGEQ(long[] buffer,
 long target,
 int from,
 int to)

prefetchPostings

private static void prefetchPostings(IndexInput docIn,
 Lucene912PostingsFormat.IntBlockTermState state)
                              throws IOException

Throws:

IOException

readImpacts

static Lucene912PostingsReader.MutableImpactList readImpacts(ByteArrayDataInput in,
 Lucene912PostingsReader.MutableImpactList reuse)

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