org.ranksys.core.preference

Interface PointWisePreferenceData<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Superinterfaces:

ItemIndex<I>, PreferenceData<U,I>, UserIndex<U>

All Known Subinterfaces:

FastPointWisePreferenceData<U,I>

All Known Implementing Classes:

SimpleFastPreferenceData, TransposedPreferenceData

public interface PointWisePreferenceData<U,I>
extends PreferenceData<U,I>

Point-wise preference data. In some cases it is necessary to access a particular user-item pair.

Author:

Saúl Vargas (Saul.Vargas@mendeley.com)

Method Summary

Modifier and Type	Method and Description
Optional<? extends IdPref<I>>	getPreference(U u, I i) Get preference of a user for an item.

Methods inherited from interface es.uam.eps.ir.ranksys.core.preference.PreferenceData

getItemPreferences, getItemsWithPreferences, getUserPreferences, getUsersWithPreferences, numItems, numItemsWithPreferences, numPreferences, numUsers, numUsersWithPreferences

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

getPreference

Optional<? extends IdPref<I>> getPreference(U u,
                                            I i)

Get preference of a user for an item.

Parameters:

u - user

i - item

Returns:

optional preference for item if it exists