uk.ac.gla.terrier.structures.indexing
Class BlockDocumentPostingList

java.lang.Object
  uk.ac.gla.terrier.structures.indexing.DocumentPostingList
      uk.ac.gla.terrier.structures.indexing.BlockDocumentPostingList

public class BlockDocumentPostingList
extends DocumentPostingList

Represents the postings of one document, and saves block (term position) information. Uses HashMaps internally.

Properties:

• indexing.avg.unique.terms.per.doc - number of unique terms per doc on average, used to tune the initial size of the haashmaps used in this class.

See Also:

DocumentPostingList

Constructor Summary

BlockDocumentPostingList()
Instantiate a new block document posting list.

BlockDocumentPostingList(int fieldCount)
Instantiate a new block document posting list.

Method Summary

int[][]	getPostings() returns the postings suitable to be written into the block direct index
void	insert(java.lang.String t, int blockId) Insert a term into this document, occurs at given block id
void	insert(java.lang.String t, int[] fieldIds, int blockId) Insert a term into this document, occurs at given block id, and in the given fields
void	insert(java.lang.String t, int fieldId, int blockId) Insert a term into this document, occurs at given block id, and in the given field

Methods inherited from class uk.ac.gla.terrier.structures.indexing.DocumentPostingList

clear, getDocumentLength, getNumberOfPointers, insert, insert

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockDocumentPostingList

public BlockDocumentPostingList()

Instantiate a new block document posting list. Saves block information, but no fields

BlockDocumentPostingList

public BlockDocumentPostingList(int fieldCount)

Instantiate a new block document posting list. Saves block information, with the specified number of fields

Method Detail

insert

public void insert(java.lang.String t,
                   int blockId)

Insert a term into this document, occurs at given block id

Overrides:

insert in class DocumentPostingList

Parameters:

t - the Term being inserted

blockId - the id of the field that the term was found in

insert

public void insert(java.lang.String t,
                   int fieldId,
                   int blockId)

Insert a term into this document, occurs at given block id, and in the given field

insert

public void insert(java.lang.String t,
                   int[] fieldIds,
                   int blockId)

Insert a term into this document, occurs at given block id, and in the given fields

getPostings

public int[][] getPostings()

returns the postings suitable to be written into the block direct index

Overrides:

getPostings in class DocumentPostingList