org.lenskit.data.ratings

Class EntityCountRatingVectorPDAO

java.lang.Object

org.lenskit.data.ratings.EntityCountRatingVectorPDAO

All Implemented Interfaces:

RatingVectorPDAO

@ThreadSafe
public class EntityCountRatingVectorPDAO
extends Object
implements RatingVectorPDAO

Rating vector DAO that counts entities appearing for a user.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	EntityCountRatingVectorPDAO.CountedType Qualifier for the type of entities that are counted to compute user preferences.

Constructor Summary

Constructors

Constructor and Description
EntityCountRatingVectorPDAO(DataAccessObject dao, EntityType type) Construct a rating vector source.

Method Summary

Modifier and Type	Method and Description
ObjectStream<IdBox<Long2DoubleMap>>	streamUsers() Stream all users in the data set.
Long2DoubleMap	userRatingVector(long user) Get a user’s rating vector.

Methods inherited from class java.lang.Object

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

Constructor Detail

EntityCountRatingVectorPDAO

@Inject
public EntityCountRatingVectorPDAO(DataAccessObject dao,
                                            @EntityCountRatingVectorPDAO.CountedType
                                            EntityType type)

Construct a rating vector source.

Parameters:

dao - The data access object.

type -

Method Detail

userRatingVector

@Nonnull
public Long2DoubleMap userRatingVector(long user)

Description copied from interface: RatingVectorPDAO

Get a user’s rating vector.

Specified by:

userRatingVector in interface RatingVectorPDAO

Parameters:

user - The rating vector summarizing a user’s historical preferences.

Returns:

The unnormmalized user rating vector. Will return an empty vector for nonexistent users.

streamUsers

public ObjectStream<IdBox<Long2DoubleMap>> streamUsers()

Description copied from interface: RatingVectorPDAO

Stream all users in the data set.

Specified by:

streamUsers in interface RatingVectorPDAO

Returns:

A stream over the users in the data set.