org.terrier.structures.indexing.singlepass
Class BlockPosting

java.lang.Object
  org.terrier.structures.indexing.singlepass.Posting
      org.terrier.structures.indexing.singlepass.BlockPosting

Direct Known Subclasses:

BlockFieldPosting

public class BlockPosting
extends Posting

Class representing a posting list in memory with block information It keeps the information for DF, TF, and the sequence [doc, tf, blockCount, [blockId]]

Author:

Roi Blanco

Field Summary

Fields inherited from class org.terrier.structures.indexing.singlepass.Posting

docIds, lastInt, Nt, TF

Constructor Summary

BlockPosting()

Method Summary

int	insert(int doc, int freq, int[] blockids) Inserts a new document in the posting list.
int	writeFirstDoc(int doc, int frequency, int[] blockids) Writes the first document in the posting list.

Methods inherited from class org.terrier.structures.indexing.singlepass.Posting

getDocF, getDocs, getSize, getTF, insert, setDocF, setDocs, setTF, writeFirstDoc

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockPosting

public BlockPosting()

Method Detail

writeFirstDoc

public int writeFirstDoc(int doc,
                         int frequency,
                         int[] blockids)
                  throws java.io.IOException

Writes the first document in the posting list.

Parameters:

doc - the document identifier.

frequency - the frequency of the term in the document.

blockids - the blockids for all the term

Throws:

java.io.IOException - if an I/O error ocurrs.

insert

public int insert(int doc,
                  int freq,
                  int[] blockids)
           throws java.io.IOException

Inserts a new document in the posting list. Document insertions must be done in order.

Parameters:

doc - the document identifier.

freq - the frequency of the term in the document.

blockids - the blockids for all the term

Returns:

the updated term frequency.

Throws:

java.io.IOException - if and I/O error occurs.