org.lenskit.data.ratings

Class StandardRatingVectorPDAO

java.lang.Object

org.lenskit.data.ratings.StandardRatingVectorPDAO

All Implemented Interfaces:

RatingVectorPDAO

@ThreadSafe
public class StandardRatingVectorPDAO
extends java.lang.Object
implements RatingVectorPDAO

Rating vector source that extracts user ratings from the database.

Constructor Summary

Constructors

Constructor and Description
StandardRatingVectorPDAO(DataAccessObject dao) 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

StandardRatingVectorPDAO

@Inject
public StandardRatingVectorPDAO(DataAccessObject dao)

Construct a rating vector source.

Parameters:

dao - The data access object.

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.