it.unimi.di.mg4j.search.score
Class ConstantScorer

java.lang.Object
  it.unimi.di.mg4j.search.score.AbstractScorer
      it.unimi.di.mg4j.search.score.ConstantScorer

All Implemented Interfaces:

DelegatingScorer, Scorer, FlyweightPrototype<Scorer>

public class ConstantScorer
extends AbstractScorer
implements DelegatingScorer

A scorer assigning a constant score (0 by default) to all documents.

Field Summary

double

score

Fields inherited from class it.unimi.di.mg4j.search.score.AbstractScorer

documentIterator, indexIterator

Constructor Summary

ConstantScorer()

ConstantScorer(double score)

ConstantScorer(String score)

Method Summary

ConstantScorer	copy()
double	score() Returns a score for the current document of the last document iterator given to Scorer.wrap(DocumentIterator).
double	score(Index index) Returns a score for the current document of the last document iterator given to Scorer.wrap(DocumentIterator), but considering only a given index (optional operation).
String	toString()
boolean	usesIntervals() Whether this scorer uses intervals.

Methods inherited from class it.unimi.di.mg4j.search.score.AbstractScorer

getWeights, nextDocument, setWeights, wrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.di.mg4j.search.score.Scorer

getWeights, nextDocument, setWeights, wrap

Field Detail

score

public final double score

Constructor Detail

ConstantScorer

public ConstantScorer(double score)

ConstantScorer

public ConstantScorer(String score)

ConstantScorer

public ConstantScorer()

Method Detail

score

public double score(Index index)

Description copied from interface: Scorer

Returns a score for the current document of the last document iterator given to Scorer.wrap(DocumentIterator), but considering only a given index (optional operation).

Specified by:

score in interface Scorer

Parameters:

index - the only index to be considered.

Returns:

the score.

score

public double score()

Description copied from interface: Scorer

Returns a score for the current document of the last document iterator given to Scorer.wrap(DocumentIterator).

Specified by:

score in interface Scorer

Returns:

the score.

copy

public ConstantScorer copy()

Specified by:

copy in interface DelegatingScorer

Specified by:

copy in interface Scorer

Specified by:

copy in interface FlyweightPrototype<Scorer>

usesIntervals

public boolean usesIntervals()

Description copied from interface: Scorer

Whether this scorer uses intervals.

This method is essential when aggregating scorers, because if several scores need intervals, a CachingDocumentIterator will be necessary.

Specified by:

usesIntervals in interface Scorer

Returns:

true if this scorer uses intervals.

toString

public String toString()

Overrides:

toString in class Object