ivory.lsh.data

Interface DfTable

All Known Implementing Classes:

DfTableArray

public interface DfTable

Interface to object that keeps track of the document frequency of each term in the collection. Concrete classes may vary in terms of implementation, e.g., hashes (faster lookup, but less memory efficient) or arrays (slower binary search lookup, but more memory efficient).

Author:

Jimmy Lin

Method Summary

Methods

Modifier and Type	Method and Description
int	getCountOfTermWithDfOne() Returns the number of terms that only appear in one document.
int	getDf(String term) Returns the document frequency of a term.
int	getDocumentCount() Returns the number of documents in the collection.
int	getMaxDf() Returns the document frequency of the term with the highest document frequency.
String	getMaxDfTerm() Returns the term with the highest document frequency.
int	getVocabularySize() Returns the number of unique terms in the collection.

Method Detail

getCountOfTermWithDfOne

int getCountOfTermWithDfOne()

Returns the number of terms that only appear in one document.

getDf

int getDf(String term)

Returns the document frequency of a term.

getDocumentCount

int getDocumentCount()

Returns the number of documents in the collection.

getMaxDf

int getMaxDf()

Returns the document frequency of the term with the highest document frequency.

getMaxDfTerm

String getMaxDfTerm()

Returns the term with the highest document frequency.

getVocabularySize

int getVocabularySize()

Returns the number of unique terms in the collection.