com.bigdata.search

Class TermFrequencyData<V extends Comparable<V>>

java.lang.Object

com.bigdata.search.TermFrequencyData<V>

Type Parameters:

V - The generic type of the document identifier.

public class TermFrequencyData<V extends Comparable<V>>
extends Object

Models the term-frequency data associated with a single field of some document.

Version:

$Id$

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
V	docId The document identifier.
int	fieldId The field identifier.
LinkedHashMap<String,ITermMetadata>	terms The set of distinct tokens and their ITermMetadata.

Constructor Summary

Constructors

Constructor and Description
TermFrequencyData(V docId, int fieldId, String token)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(String token) Add a Token.
int	distinctTermCount() The #of distinct terms.
Map.Entry<String,ITermMetadata>	getSingletonEntry()
double	normalize() Computes the normalized term-frequency vector.
int	totalTermCount() The total #of terms, including duplicates.

Methods inherited from class java.lang.Object

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

Field Detail

docId

public final V extends Comparable<V> docId

The document identifier.

fieldId

public final int fieldId

The field identifier.

terms

public final LinkedHashMap<String,ITermMetadata> terms

The set of distinct tokens and their ITermMetadata.

Constructor Detail

TermFrequencyData

public TermFrequencyData(V docId,
                 int fieldId,
                 String token)

Method Detail

add

public boolean add(String token)

Add a Token.

Parameters:

token - The token.

Returns:

true iff the termText did not previously exist for this TermFrequencyData.

distinctTermCount

public int distinctTermCount()

The #of distinct terms.

totalTermCount

public int totalTermCount()

The total #of terms, including duplicates.

normalize

public double normalize()

Computes the normalized term-frequency vector. This is a unit vector whose magnitude is 1.0. The magnitude of the term frequency vector is computed using the integer term frequency values reported by TermMetadata.termFreq(). The normalized values are then set on TermMetadata.localTermWeight.

Returns:

The magnitude of the un-normalized TermMetadata.termFreq() vector.

getSingletonEntry

public Map.Entry<String,ITermMetadata> getSingletonEntry()