org.ranksys.fast.preference

Class StreamsAbstractFastPreferenceData<U,I>

java.lang.Object

es.uam.eps.ir.ranksys.fast.preference.AbstractFastPreferenceData<U,I>

org.ranksys.fast.preference.StreamsAbstractFastPreferenceData<U,I>

Type Parameters:

U - user type

I - item type

All Implemented Interfaces:

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

Direct Known Subclasses:

SimpleFastPreferenceData

public abstract class StreamsAbstractFastPreferenceData<U,I>
extends AbstractFastPreferenceData<U,I>

Extends AbstractFastPreferenceData and implements the data access iterator-based methods using the stream-based ones. Avoids duplicating code where stream-based methods are preferred.

Author:

Saúl Vargas (Saul@VargasSandoval.es)

See Also:

Serialized Form

Field Summary

Fields inherited from class es.uam.eps.ir.ranksys.fast.preference.AbstractFastPreferenceData

ii, iPrefFun, ui, uPrefFun

Constructor Summary

Constructors

Constructor and Description
StreamsAbstractFastPreferenceData(FastUserIndex<U> userIndex, FastItemIndex<I> itemIndex) Constructor with default IdxPref to IdPref converter.
StreamsAbstractFastPreferenceData(FastUserIndex<U> userIndex, FastItemIndex<I> itemIndex, Function<IdxPref,IdPref<I>> uPrefFun, Function<IdxPref,IdPref<U>> iPrefFun) Constructor with custom IdxPref to IdPref converter.

Method Summary

Modifier and Type	Method and Description
it.unimi.dsi.fastutil.ints.IntIterator	getIidxUidxs(int iidx) Returns the user idxs of the preferences for an item.
it.unimi.dsi.fastutil.doubles.DoubleIterator	getIidxVs(int iidx) Returns the user values of the preferences for an item.
it.unimi.dsi.fastutil.ints.IntIterator	getUidxIidxs(int uidx) Returns the item idxs of the preferences of a user.
it.unimi.dsi.fastutil.doubles.DoubleIterator	getUidxVs(int uidx) Returns the item values of the preferences of a user.
boolean	useIteratorsPreferentially() Use methods returning IntIterator or DoubleIterator over streams of IdxPref?

Methods inherited from class es.uam.eps.ir.ranksys.fast.preference.AbstractFastPreferenceData

containsItem, containsUser, getAllItems, getAllUsers, getItemPreferences, getItemsWithPreferences, getUserPreferences, getUsersWithPreferences, iidx2item, item2iidx, numItems, numItems, numItemsWithPreferences, numUsers, numUsers, numUsersWithPreferences, uidx2user, user2uidx

Methods inherited from class java.lang.Object

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

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

getIidxPreferences, getIidxWithPreferences, getUidxPreferences, getUidxWithPreferences, numItems, numUsers

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

numPreferences

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

getAllUidx, uidx2user, uidx2user, user2uidx, user2uidx

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

getAllIidx, iidx2item, iidx2item, item2iidx, item2iidx

Constructor Detail

StreamsAbstractFastPreferenceData

public StreamsAbstractFastPreferenceData(FastUserIndex<U> userIndex,
                                         FastItemIndex<I> itemIndex)

Constructor with default IdxPref to IdPref converter.

Parameters:

userIndex - user index

itemIndex - item index

StreamsAbstractFastPreferenceData

public StreamsAbstractFastPreferenceData(FastUserIndex<U> userIndex,
                                         FastItemIndex<I> itemIndex,
                                         Function<IdxPref,IdPref<I>> uPrefFun,
                                         Function<IdxPref,IdPref<U>> iPrefFun)

Constructor with custom IdxPref to IdPref converter.

Parameters:

userIndex - user index

itemIndex - item index

uPrefFun - user IdxPref to IdPref converter

iPrefFun - item IdxPref to IdPref converter

Method Detail

getUidxIidxs

public it.unimi.dsi.fastutil.ints.IntIterator getUidxIidxs(int uidx)

Description copied from interface: FastPreferenceData

Returns the item idxs of the preferences of a user.

Parameters:

uidx - user index

Returns:

iterator of the idxs of the items

getUidxVs

public it.unimi.dsi.fastutil.doubles.DoubleIterator getUidxVs(int uidx)

Description copied from interface: FastPreferenceData

Returns the item values of the preferences of a user.

Parameters:

uidx - user index

Returns:

iterator of the values of the items

getIidxUidxs

public it.unimi.dsi.fastutil.ints.IntIterator getIidxUidxs(int iidx)

Description copied from interface: FastPreferenceData

Returns the user idxs of the preferences for an item.

Parameters:

iidx - item index

Returns:

iterator of the idxs of the users.

getIidxVs

public it.unimi.dsi.fastutil.doubles.DoubleIterator getIidxVs(int iidx)

Description copied from interface: FastPreferenceData

Returns the user values of the preferences for an item.

Parameters:

iidx - item index

Returns:

iterator of the values of the users

useIteratorsPreferentially

public boolean useIteratorsPreferentially()

Description copied from interface: FastPreferenceData

Use methods returning IntIterator or DoubleIterator over streams of IdxPref?

Returns:

yes/no