Package org.apache.lucene.codecs.lucene84

Class Lucene84PostingsReader

java.lang.Object

org.apache.lucene.codecs.PostingsReaderBase

org.apache.lucene.codecs.lucene84.Lucene84PostingsReader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, Accountable

public final class Lucene84PostingsReader
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) class	Lucene84PostingsReader.BlockDocsEnum
(package private) class	Lucene84PostingsReader.BlockImpactsDocsEnum
(package private) class	Lucene84PostingsReader.BlockImpactsEverythingEnum
(package private) class	Lucene84PostingsReader.BlockImpactsPostingsEnum
(package private) class	Lucene84PostingsReader.EverythingEnum

Field Summary

Fields

Modifier and Type	Field	Description
private static long	BASE_RAM_BYTES_USED
private IndexInput	docIn
private IndexInput	payIn
private IndexInput	posIn
private int	version

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

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Constructor	Description
Lucene84PostingsReader(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.
(package private) static void	prefixSum(long[] buffer, int count, long base)
long	ramBytesUsed()	Return the memory usage of this object in bytes.
(package private) static void	readVIntBlock(IndexInput docIn, long[] docBuffer, long[] freqBuffer, int num, boolean indexHasFreq)	Read values that have been written using variable-length encoding instead of bit-packing.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

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

getChildResources

Field Detail

BASE_RAM_BYTES_USED

private static final long BASE_RAM_BYTES_USED

docIn

private final IndexInput docIn

posIn

private final IndexInput posIn

payIn

private final IndexInput payIn

version

private final int version

Constructor Detail

Lucene84PostingsReader

public Lucene84PostingsReader(SegmentReadState state)
                       throws java.io.IOException

Sole constructor.

Throws:

java.io.IOException

Method Detail

init

public void init(IndexInput termsIn,
                 SegmentReadState state)
          throws java.io.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:

java.io.IOException

readVIntBlock

static void readVIntBlock(IndexInput docIn,
                          long[] docBuffer,
                          long[] freqBuffer,
                          int num,
                          boolean indexHasFreq)
                   throws java.io.IOException

Read values that have been written using variable-length encoding instead of bit-packing.

Throws:

java.io.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 java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Specified by:

close in class PostingsReaderBase

Throws:

java.io.IOException

decodeTerm

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

Description copied from class: PostingsReaderBase

Actually decode metadata for next term

Specified by:

decodeTerm in class PostingsReaderBase

Throws:

java.io.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 java.io.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:

java.io.IOException

impacts

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

Description copied from class: PostingsReaderBase

Return a ImpactsEnum that computes impacts with scorer.

Specified by:

impacts in class PostingsReaderBase

Throws:

java.io.IOException

See Also:

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

ramBytesUsed

public long ramBytesUsed()

Description copied from interface: Accountable

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

checkIntegrity

public void checkIntegrity()
                    throws java.io.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:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object