org.terrier.structures.indexing.singlepass
Class FieldPosting

java.lang.Object
  org.terrier.structures.indexing.singlepass.Posting
      org.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, field_f, field_f, field_f])

Author:

Roi Blanco and Craig Macdonald

Field Summary

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

docIds, lastInt, Nt, TF

Constructor Summary

FieldPosting()

Method Summary

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

FieldPosting

public FieldPosting()

Method Detail

writeFirstDoc

public int writeFirstDoc(int doc,
                         int frequency,
                         int[] fieldFrequencies)
                  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.

fieldFrequencies - tf in each field 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[] fieldFrequencies)
           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.

fieldFrequencies - the frequency of the term in the document.

Returns:

the number of bytes consumed in the buffer

Throws:

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