es.uam.eps.ir.ranksys.core.preference

Interface PreferenceData<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Superinterfaces:

ItemIndex<I>, UserIndex<U>

All Known Subinterfaces:

FastPointWisePreferenceData<U,I>, FastPreferenceData<U,I>, PointWisePreferenceData<U,I>

All Known Implementing Classes:

AbstractCODECPreferenceData, AbstractFastPreferenceData, BinaryCODECPreferenceData, ConcatPreferenceData, IteratorsAbstractFastPreferenceData, RatingCODECPreferenceData, SimpleFastPreferenceData, SimplePreferenceData, StreamsAbstractFastPreferenceData, TransposedPreferenceData

public interface PreferenceData<U,I>
extends UserIndex<U>, ItemIndex<I>

User-item preference data required for recommendation algorithms.

Author:

Saúl Vargas (saul.vargas@uam.es)

Method Summary

Modifier and Type	Method and Description
Stream<? extends IdPref<U>>	getItemPreferences(I i) Returns a stream of the preferences of the item
Stream<I>	getItemsWithPreferences() Returns a stream of the items with preferences
Stream<? extends IdPref<I>>	getUserPreferences(U u) Returns a stream of the preferences of the user
Stream<U>	getUsersWithPreferences() Returns a stream of the users with preferences
int	numItems(U u) Returns the number of items with preference for user u
int	numItemsWithPreferences() Returns the number of items with preferences.
int	numPreferences() Returns the total number of preferences
int	numUsers(I i) Returns the number of users with preference for item i
int	numUsersWithPreferences() Returns the number of users with preferences.

Methods inherited from interface es.uam.eps.ir.ranksys.core.index.UserIndex

containsUser, getAllUsers, numUsers

Methods inherited from interface es.uam.eps.ir.ranksys.core.index.ItemIndex

containsItem, getAllItems, numItems

Method Detail

numUsersWithPreferences

int numUsersWithPreferences()

Returns the number of users with preferences.

Returns:

number of users with preferences

numItemsWithPreferences

int numItemsWithPreferences()

Returns the number of items with preferences.

Returns:

number of items with preferences

numUsers

int numUsers(I i)

Returns the number of users with preference for item i

Parameters:

i - item

Returns:

number of users with preferences for item i

numItems

int numItems(U u)

Returns the number of items with preference for user u

Parameters:

u - user

Returns:

number of items with preferences for user u

numPreferences

int numPreferences()

Returns the total number of preferences

Returns:

total number of preferences

getUsersWithPreferences

Stream<U> getUsersWithPreferences()

Returns a stream of the users with preferences

Returns:

stream of users with preferences

getItemsWithPreferences

Stream<I> getItemsWithPreferences()

Returns a stream of the items with preferences

Returns:

stream of items with preferences

getUserPreferences

Stream<? extends IdPref<I>> getUserPreferences(U u)

Returns a stream of the preferences of the user

Parameters:

u - user

Returns:

stream of preferences

getItemPreferences

Stream<? extends IdPref<U>> getItemPreferences(I i)

Returns a stream of the preferences of the item

Parameters:

i - item

Returns:

stream of preferences