Package it.unimi.di.big.mg4j.index

Class InMemoryHPIndex

java.lang.Object

it.unimi.di.big.mg4j.index.Index

it.unimi.di.big.mg4j.index.BitStreamIndex

it.unimi.di.big.mg4j.index.BitStreamHPIndex

it.unimi.di.big.mg4j.index.InMemoryHPIndex

All Implemented Interfaces:

Serializable

public class InMemoryHPIndex
extends BitStreamHPIndex

A BitStreamHPIndex index loaded in memory.

In-memory indices are created by loading into main memory an index.

Since:

1.2

Author:

Sebastiano Vigna

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class it.unimi.di.big.mg4j.index.BitStreamIndex

BitStreamIndex.PropertyKeys

Nested classes/interfaces inherited from class it.unimi.di.big.mg4j.index.Index

Index.EmptyIndexIterator, Index.UriKeys

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	index	The byte array containing the index.
protected byte[]	positions	The byte array containing the positions.

Fields inherited from class it.unimi.di.big.mg4j.index.BitStreamIndex

bufferSize, countCoding, DEFAULT_BUFFER_SIZE, DEFAULT_FIXED_QUANTUM, DEFAULT_HEIGHT, DEFAULT_QUANTUM, FIXED_POINT_BITS, FIXED_POINT_MULTIPLIER, frequencyCoding, height, offsets, pointerCoding, positionCoding, quantum, readerConstructor

Fields inherited from class it.unimi.di.big.mg4j.index.Index

field, hasCounts, hasPayloads, hasPositions, keyIndex, maxCount, numberOfDocuments, numberOfOccurrences, numberOfPostings, numberOfTerms, payload, prefixMap, properties, singletonSet, sizes, termMap, termProcessor

Constructor Summary

Constructors

Constructor

Description

InMemoryHPIndex(byte[] index, byte[] positions, long numberOfDocuments, long numberOfTerms, long numberOfPostings, long numberOfOccurrences, int maxCount, Payload payload, CompressionFlags.Coding frequencyCoding, CompressionFlags.Coding pointerCoding, CompressionFlags.Coding countCoding, CompressionFlags.Coding positionCoding, int quantum, int height, TermProcessor termProcessor, String field, Properties properties, StringMap<? extends CharSequence> termMap, PrefixMap<? extends CharSequence> prefixMap, IntBigList sizes, LongBigList offsets)

Method Summary

Modifier and Type	Method	Description
InputBitStream	getInputBitStream(int bufferSizeUnused)	Returns an input bit stream over the index.
InputStream	getInputStream()	Returns an input stream over the index.
InputBitStream	getPositionsInputBitStream(int bufferSizeUnused)	Returns an input bit stream over the index.
InputStream	getPositionsInputStream()	Returns an input stream over the index.
String	toString()

Methods inherited from class it.unimi.di.big.mg4j.index.BitStreamHPIndex

getConstructor, getReader

Methods inherited from class it.unimi.di.big.mg4j.index.BitStreamIndex

featureName, gaussianGolombModulus, golombModulus, quantumSigma

Methods inherited from class it.unimi.di.big.mg4j.index.Index

documents, documents, documents, getEmptyIndexIterator, getEmptyIndexIterator, getEmptyIndexIterator, getEmptyIndexIterator, getInstance, getInstance, getInstance, getInstance, getInstance, getReader, getTermProcessor, keyIndex

Methods inherited from class java.lang.Object

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

Field Detail

index

protected final byte[] index

The byte array containing the index.

positions

protected final byte[] positions

The byte array containing the positions.

Constructor Detail

InMemoryHPIndex

public InMemoryHPIndex(byte[] index,
                       byte[] positions,
                       long numberOfDocuments,
                       long numberOfTerms,
                       long numberOfPostings,
                       long numberOfOccurrences,
                       int maxCount,
                       Payload payload,
                       CompressionFlags.Coding frequencyCoding,
                       CompressionFlags.Coding pointerCoding,
                       CompressionFlags.Coding countCoding,
                       CompressionFlags.Coding positionCoding,
                       int quantum,
                       int height,
                       TermProcessor termProcessor,
                       String field,
                       Properties properties,
                       StringMap<? extends CharSequence> termMap,
                       PrefixMap<? extends CharSequence> prefixMap,
                       IntBigList sizes,
                       LongBigList offsets)

Method Detail

toString

public String toString()

Overrides:

toString in class BitStreamIndex

getInputBitStream

public InputBitStream getInputBitStream(int bufferSizeUnused)

Description copied from class: BitStreamIndex

Returns an input bit stream over the index.

Specified by:

getInputBitStream in class BitStreamIndex

Parameters:

bufferSizeUnused - a suggested buffer size.

Returns:

an input bit stream over the index.

getInputStream

public InputStream getInputStream()

Description copied from class: BitStreamIndex

Returns an input stream over the index.

Specified by:

getInputStream in class BitStreamIndex

Returns:

an input stream over the index.

getPositionsInputBitStream

public InputBitStream getPositionsInputBitStream(int bufferSizeUnused)
                                          throws IOException

Description copied from class: BitStreamHPIndex

Returns an input bit stream over the index.

Specified by:

getPositionsInputBitStream in class BitStreamHPIndex

Parameters:

bufferSizeUnused - a suggested buffer size.

Returns:

an input bit stream over the index.

Throws:

IOException

getPositionsInputStream

public InputStream getPositionsInputStream()
                                    throws IOException

Description copied from class: BitStreamHPIndex

Returns an input stream over the index.

Specified by:

getPositionsInputStream in class BitStreamHPIndex

Returns:

an input stream over the index.

Throws:

IOException