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

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

insert

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

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

getBlocks

public int[] getBlocks(java.lang.String term)

getPostings

public int[][] getPostings()

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

Overrides:

getPostings in class DocumentPostingList