org.lenskit.basic

Class ConstantItemScorer

java.lang.Object

org.lenskit.basic.AbstractItemScorer

org.lenskit.basic.ConstantItemScorer

All Implemented Interfaces:

java.io.Serializable, ItemScorer

Direct Known Subclasses:

GlobalMeanRatingItemScorer

@Shareable
public class ConstantItemScorer
extends AbstractItemScorer
implements java.io.Serializable

Item scorer that returns a fixed score for all items.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ConstantItemScorer.Value The value used by the constant scorer.

Constructor Summary

Constructors

Constructor and Description
ConstantItemScorer(double score) Create a new constant item scorer.

Method Summary

Modifier and Type	Method and Description
ResultMap	scoreWithDetails(long user, java.util.Collection<java.lang.Long> items) Score a collection of items and potentially return more details on the scores.

Methods inherited from class org.lenskit.basic.AbstractItemScorer

score, score

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantItemScorer

@Inject
public ConstantItemScorer(@ConstantItemScorer.Value
                                  double score)

Create a new constant item scorer.

Parameters:

score - The score to return.

Method Detail

scoreWithDetails

@Nonnull
public ResultMap scoreWithDetails(long user,
                                           @Nonnull
                                           java.util.Collection<java.lang.Long> items)

Description copied from interface: ItemScorer

Score a collection of items and potentially return more details on the scores.

Specified by:

scoreWithDetails in interface ItemScorer

Parameters:

user - The user ID for whom to generate scores.

items - The item to score.

Returns:

The scores for the items. This result set may not contain all requested items. Implementations that support additional details will return a subclass of ResultMap that provides access to those details.