org.terrier.structures.bit

Class BlockInvertedIndex

java.lang.Object

org.terrier.structures.bit.BitPostingIndex

org.terrier.structures.bit.InvertedIndex

org.terrier.structures.bit.BlockInvertedIndex

All Implemented Interfaces:

Closeable, AutoCloseable, IndexConfigurable, PostingIndex<BitIndexPointer>

Deprecated.

public class BlockInvertedIndex
extends InvertedIndex
implements IndexConfigurable

This class implements the block field inverted index for performing retrieval.

Author:

Douglas Johnson, Craig Macdonald et al.

Nested Class Summary

Nested classes/interfaces inherited from interface org.terrier.structures.PostingIndex

PostingIndex.DocidSpecificDocumentIndex

Field Summary

Fields

Modifier and Type	Field and Description
protected int	DocumentBlockCountDelta Deprecated.

Fields inherited from class org.terrier.structures.bit.InvertedIndex

doi, FIELD_LOAD_FACTOR, logger, NORMAL_LOAD_FACTOR

Fields inherited from class org.terrier.structures.bit.BitPostingIndex

fieldCount, file, index, postingConstructor, postingImplementation

Constructor Summary

Constructors

Constructor and Description
BlockInvertedIndex(IndexOnDisk index, String structureName) Deprecated. Constructs an instance of the class with
BlockInvertedIndex(IndexOnDisk index, String structureName, DocumentIndex doi) Deprecated. Constructs an instance of the class with
BlockInvertedIndex(IndexOnDisk index, String structureName, DocumentIndex _doi, Class<? extends IterablePosting> postingClass) Deprecated. Constructs an instance of the class with

Method Summary

Methods

Modifier and Type	Method and Description
int[][]	getDocuments(BitIndexPointer pointer) Deprecated. Returns a 2D array containing the document ids, the term frequencies, the field scores the block frequencies and the block ids for the given documents.
void	setIndex(Index i) Deprecated. let it know which index to use

Methods inherited from class org.terrier.structures.bit.InvertedIndex

getBitFiles, getDocuments, getPostings, print

Methods inherited from class org.terrier.structures.bit.BitPostingIndex

close, setPostingImplementation

Methods inherited from class java.lang.Object

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

Field Detail

DocumentBlockCountDelta

protected int DocumentBlockCountDelta

Deprecated.

Constructor Detail

BlockInvertedIndex

public BlockInvertedIndex(IndexOnDisk index,
                  String structureName,
                  DocumentIndex _doi,
                  Class<? extends IterablePosting> postingClass)
                   throws IOException

Deprecated.

Constructs an instance of the class with

Parameters:

index -

structureName -

_doi -

postingClass -

Throws:

IOException

BlockInvertedIndex

public BlockInvertedIndex(IndexOnDisk index,
                  String structureName,
                  DocumentIndex doi)
                   throws IOException

Deprecated.

Constructs an instance of the class with

Parameters:

index -

structureName -

doi -

Throws:

IOException

BlockInvertedIndex

public BlockInvertedIndex(IndexOnDisk index,
                  String structureName)
                   throws IOException

Deprecated.

Constructs an instance of the class with

Parameters:

index -

structureName -

Throws:

IOException

Method Detail

setIndex

public void setIndex(Index i)

Deprecated.

let it know which index to use

Specified by:

setIndex in interface IndexConfigurable

Parameters:

i - Index object to use

getDocuments

public int[][] getDocuments(BitIndexPointer pointer)

Deprecated.

Returns a 2D array containing the document ids, the term frequencies, the field scores the block frequencies and the block ids for the given documents.

Overrides:

getDocuments in class InvertedIndex

Parameters:

pointer - start byte and bit offset of the postings in the inverted file, together with number of postings to expect

Returns:

int[][] the five dimensional [5][] array containing the document ids, frequencies, field scores and block frequencies, while the last vector contains the block identifiers and it has a different length from the document identifiers.