uk.ac.gla.terrier.structures.indexing.singlepass
Class FieldPosting

java.lang.Object
  uk.ac.gla.terrier.structures.indexing.singlepass.Posting
      uk.ac.gla.terrier.structures.indexing.singlepass.FieldPosting

public class FieldPosting
extends Posting

Class holding the information for a posting list read from a previously written run at disk. Used in the merging phase of the Single pass inversion method. This class knows how to append itself to a BitOutputStream and it represents a posting with field information (tf, df, [docid, idf, fieldScore])

Author:

Roi Blanco

Constructor Summary

FieldPosting()

Method Summary

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

Methods inherited from class uk.ac.gla.terrier.structures.indexing.singlepass.Posting

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

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldPosting

public FieldPosting()

Method Detail

writeFirstDoc

public void writeFirstDoc(int doc,
                          int frequency,
                          int fieldScore)
                   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.

fieldScore - field score for the term in the document.

Throws:

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

insert

public int insert(int doc,
                  int freq,
                  int fieldScore)
           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.

fieldScore - field score for the term in the document.

Returns:

the updated term frequency.

Throws:

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