C# Класс Lucene.Net.Codecs.BlockTreeTermsReader

A block-based terms index and dictionary that assigns terms to variable length blocks according to how they share prefixes. The terms index is a prefix trie whose leaves are term blocks. The advantage of this approach is that seekExact is often able to determine a term cannot exist without doing any IO, and intersection with Automata is very fast. Note that this terms dictionary has it's own fixed terms index (ie, it does not support a pluggable terms index implementation).

NOTE: this terms dictionary does not support index divisor when opening an IndexReader. Instead, you can change the min/maxItemsPerBlock during indexing.

The data structure used by this implementation is very similar to a burst trie (http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.18.3499), but with added logic to break up too-large blocks of all terms sharing a given prefix into smaller ones.

Use Lucene.Net.Index.CheckIndex with the -verbose option to see summary statistics on the blocks in the dictionary. See BlockTreeTermsWriter. @lucene.experimental

Наследование: Lucene.Net.Codecs.FieldsProducer

Показать файл Открыть проект Примеры использования класса

Открытые методы

Метод	Описание
BlockTreeTermsReader ( Directory dir, FieldInfos fieldInfos, SegmentInfo info, Lucene.Net.Codecs.PostingsReaderBase postingsReader, IOContext ioContext, string segmentSuffix, int indexDivisor ) : System	Sole constructor.
CheckIntegrity ( ) : void
Dispose ( ) : void
GetEnumerator ( ) : IEnumerator
RamBytesUsed ( ) : long
Terms ( string field ) : Terms

Защищенные методы

Метод	Описание
ReadHeader ( IndexInput input ) : int	Reads terms file header.
ReadIndexHeader ( IndexInput input ) : int	Reads index file header.
SeekDir ( IndexInput input, long dirOffset ) : void	Seek {@code input} to the directory offset.

Приватные методы

Метод	Описание
BrToString ( BytesRef b ) : string
InitializeInstanceFields ( ) : void

Описание методов

BlockTreeTermsReader() публичный Метод

Sole constructor.

public BlockTreeTermsReader ( Directory dir, FieldInfos fieldInfos, SegmentInfo info, Lucene.Net.Codecs.PostingsReaderBase postingsReader, IOContext ioContext, string segmentSuffix, int indexDivisor ) : System
dir	Directory
fieldInfos	FieldInfos
info	SegmentInfo
postingsReader	Lucene.Net.Codecs.PostingsReaderBase
ioContext	IOContext
segmentSuffix	string
indexDivisor	int
Результат	System

CheckIntegrity() публичный Метод

public CheckIntegrity ( ) : void
Результат	void

Dispose() публичный Метод

public Dispose ( ) : void
Результат	void

GetEnumerator() публичный Метод

public GetEnumerator ( ) : IEnumerator
Результат	IEnumerator

RamBytesUsed() публичный Метод

public RamBytesUsed ( ) : long
Результат	long

ReadHeader() защищенный Метод

Reads terms file header.

protected ReadHeader ( IndexInput input ) : int
input	IndexInput
Результат	int

ReadIndexHeader() защищенный Метод

Reads index file header.

protected ReadIndexHeader ( IndexInput input ) : int
input	IndexInput
Результат	int

SeekDir() защищенный Метод

Seek {@code input} to the directory offset.

protected SeekDir ( IndexInput input, long dirOffset ) : void
input	IndexInput
dirOffset	long
Результат	void

Terms() публичный Метод

public Terms ( string field ) : Terms
field	string
Результат	Terms