org.apache.lucene.search.similarities

Class BasicStats

java.lang.Object

org.apache.lucene.search.similarities.BasicStats

Direct Known Subclasses:

LMSimilarity.LMStats

public class BasicStats
extends Object

Stores all statistics commonly used ranking methods.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field and Description
protected double	avgFieldLength The average field length.
protected double	boost A query boost.
protected long	docFreq The document frequency.
protected long	numberOfDocuments The number of documents.
protected long	numberOfFieldTokens The total number of tokens in the field.
protected long	totalTermFreq The total number of occurrences of this term across all documents.

Constructor Summary

Constructors

Constructor and Description
BasicStats(String field, double boost) Constructor.

Method Summary

Modifier and Type	Method and Description
double	getAvgFieldLength() Returns the average field length.
double	getBoost() Returns the total boost.
long	getDocFreq() Returns the document frequency.
long	getNumberOfDocuments() Returns the number of documents.
long	getNumberOfFieldTokens() Returns the total number of tokens in the field.
long	getTotalTermFreq() Returns the total number of occurrences of this term across all documents.
void	setAvgFieldLength(double avgFieldLength) Sets the average field length.
void	setDocFreq(long docFreq) Sets the document frequency.
void	setNumberOfDocuments(long numberOfDocuments) Sets the number of documents.
void	setNumberOfFieldTokens(long numberOfFieldTokens) Sets the total number of tokens in the field.
void	setTotalTermFreq(long totalTermFreq) Sets the total number of occurrences of this term across all documents.

Methods inherited from class java.lang.Object

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

Field Detail

numberOfDocuments

protected long numberOfDocuments

The number of documents.

numberOfFieldTokens

protected long numberOfFieldTokens

The total number of tokens in the field.

avgFieldLength

protected double avgFieldLength

The average field length.

docFreq

protected long docFreq

The document frequency.

totalTermFreq

protected long totalTermFreq

The total number of occurrences of this term across all documents.

boost

protected final double boost

A query boost. Should be applied as a multiplicative factor to the score.

Constructor Detail

BasicStats

public BasicStats(String field,
                  double boost)

Constructor.

Method Detail

getNumberOfDocuments

public long getNumberOfDocuments()

Returns the number of documents.

setNumberOfDocuments

public void setNumberOfDocuments(long numberOfDocuments)

Sets the number of documents.

getNumberOfFieldTokens

public long getNumberOfFieldTokens()

Returns the total number of tokens in the field.

See Also:

Terms.getSumTotalTermFreq()

setNumberOfFieldTokens

public void setNumberOfFieldTokens(long numberOfFieldTokens)

Sets the total number of tokens in the field.

See Also:

Terms.getSumTotalTermFreq()

getAvgFieldLength

public double getAvgFieldLength()

Returns the average field length.

setAvgFieldLength

public void setAvgFieldLength(double avgFieldLength)

Sets the average field length.

getDocFreq

public long getDocFreq()

Returns the document frequency.

setDocFreq

public void setDocFreq(long docFreq)

Sets the document frequency.

getTotalTermFreq

public long getTotalTermFreq()

Returns the total number of occurrences of this term across all documents.

setTotalTermFreq

public void setTotalTermFreq(long totalTermFreq)

Sets the total number of occurrences of this term across all documents.

getBoost

public double getBoost()

Returns the total boost.