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

java.lang.Object
  uk.ac.gla.terrier.structures.indexing.LexiconMap
      uk.ac.gla.terrier.structures.indexing.BlockLexiconMap

public class BlockLexiconMap
extends LexiconMap

LexiconMap implementation that also keeps track of the number of blocks that a term occurrs in. This is useful for sizing the block inverted index

Constructor Summary

BlockLexiconMap()

Method Summary

void	clear() Clear the lexicon map
void	insert(DocumentPostingList _doc) Inserts all the terms from a document posting into the lexicon map
void	insert(java.lang.String term, int tf, int blockfreq) Inserts a new term in the lexicon map.
void	storeToStream(LexiconOutputStream _lexiconStream) Stores the lexicon map to a lexicon stream as a sequence of entries.

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

getNumberOfNodes, getNumberOfPointers, insert

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockLexiconMap

public BlockLexiconMap()

Method Detail

insert

public void insert(java.lang.String term,
                   int tf,
                   int blockfreq)

Inserts a new term in the lexicon map.

Parameters:

term - The term to be inserted.

tf - The id of the term.

clear

public void clear()

Clear the lexicon map

Overrides:

clear in class LexiconMap

insert

public void insert(DocumentPostingList _doc)

Inserts all the terms from a document posting into the lexicon map

Overrides:

insert in class LexiconMap

Parameters:

_doc - The postinglist for that document - must be a instance of BlockDocumentPostingList.

storeToStream

public void storeToStream(LexiconOutputStream _lexiconStream)
                   throws java.io.IOException

Stores the lexicon map to a lexicon stream as a sequence of entries.

Overrides:

storeToStream in class LexiconMap

Parameters:

_lexiconStream - The lexicon output stream to store to.

Throws:

java.io.IOException