org.lenskit.data.ratings

Class CountSumRatingVectorPDAO

java.lang.Object

org.lenskit.data.ratings.AbstractRatingVectorPDAO

org.lenskit.data.ratings.CountSumRatingVectorPDAO

All Implemented Interfaces:

RatingVectorPDAO

@ThreadSafe
public class CountSumRatingVectorPDAO
extends AbstractRatingVectorPDAO

Rating vector DAO that sums the count attributes for entities.

Field Summary

Fields inherited from class org.lenskit.data.ratings.AbstractRatingVectorPDAO

dao

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected EntityType	getEntityType() Get the desired type of entities.
protected Long2DoubleMap	makeVector(java.util.List<Entity> entities) Make a vector from entities.

Methods inherited from class org.lenskit.data.ratings.AbstractRatingVectorPDAO

streamUsers, userRatingVector

Methods inherited from class java.lang.Object

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

Constructor Detail

CountSumRatingVectorPDAO

@Inject
public CountSumRatingVectorPDAO(DataAccessObject dao,
                                        @InteractionEntityType
                                        EntityType type)

Construct a rating vector source.

Parameters:

dao - The data access object.

type - An entity type. Entities of this type should have CommonAttributes.USER_ID and CommonAttributes.ITEM_ID attributes, and a rating vector will makeVector the number of times an item ID appears for a given user ID.

Method Detail

getEntityType

protected EntityType getEntityType()

Description copied from class: AbstractRatingVectorPDAO

Get the desired type of entities.

Specified by:

getEntityType in class AbstractRatingVectorPDAO

Returns:

The desired type of entities.

makeVector

protected Long2DoubleMap makeVector(java.util.List<Entity> entities)

Description copied from class: AbstractRatingVectorPDAO

Make a vector from entities.

Specified by:

makeVector in class AbstractRatingVectorPDAO

Parameters:

entities - The entities.

Returns:

The vector.