org.ranksys.fast.preference

Interface FastPointWisePreferenceData<U,I>

Type Parameters:

U - type of the users

I - type of the items

All Superinterfaces:

FastItemIndex<I>, FastPreferenceData<U,I>, FastUserIndex<U>, ItemIndex<I>, PointWisePreferenceData<U,I>, PreferenceData<U,I>, UserIndex<U>

All Known Implementing Classes:

SimpleFastPreferenceData, TransposedPreferenceData

public interface FastPointWisePreferenceData<U,I>
extends PointWisePreferenceData<U,I>, FastPreferenceData<U,I>

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

Author:

Saúl Vargas (saul.vargas@uam.es)

Method Summary

Modifier and Type	Method and Description
Optional<? extends IdxPref>	getPreference(int uidx, int iidx) Get preference of a user for an item.

Methods inherited from interface org.ranksys.core.preference.PointWisePreferenceData

getPreference

Methods inherited from interface es.uam.eps.ir.ranksys.fast.preference.FastPreferenceData

getIidxPreferences, getIidxUidxs, getIidxVs, getIidxWithPreferences, getUidxIidxs, getUidxPreferences, getUidxVs, getUidxWithPreferences, numItems, numUsers, useIteratorsPreferentially

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.fast.index.FastUserIndex

containsUser, getAllUidx, getAllUsers, uidx2user, uidx2user, uidx2user, user2uidx, user2uidx, user2uidx

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

numUsers

Methods inherited from interface es.uam.eps.ir.ranksys.fast.index.FastItemIndex

containsItem, getAllIidx, getAllItems, iidx2item, iidx2item, iidx2item, item2iidx, item2iidx, item2iidx

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

numItems

Method Detail

getPreference

Optional<? extends IdxPref> getPreference(int uidx,
                                          int iidx)

Get preference of a user for an item.

Parameters:

uidx - user idx

iidx - item idx

Returns:

optional preference for item if it exists