org.ranksys.fast.preference

Class AbstractFastPreferenceSampler<U,I>

java.lang.Object

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

Type Parameters:

U - user type

I - item type

All Implemented Interfaces:

ItemIndex<I>, UserIndex<U>, FastItemIndex<I>, FastUserIndex<U>, PreferenceSampler<U,I>, FastPreferenceSampler<U,I>

public abstract class AbstractFastPreferenceSampler<U,I>
extends Object
implements FastPreferenceSampler<U,I>

Abstract fast preference sampler, implementing methods from FastUserIndex and FastItemIndex.

Author:

Saúl Vargas (Saul.Vargas@mendeley.com)

Constructor Summary

Constructors

Constructor and Description
AbstractFastPreferenceSampler(FastUserIndex<U> users, FastItemIndex<I> items) Constructor.

Method Summary

Modifier and Type	Method and Description
I	iidx2item(int iidx) Returns the item represented with the index.
int	item2iidx(I i) Returns the index assigned to the item.
int	numItems() Counts the number of indexed items.
int	numUsers() Counts the number of indexed users.
U	uidx2user(int uidx) Returns the user represented with the index.
int	user2uidx(U u) Returns the index assigned to the user.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ranksys.fast.preference.FastPreferenceSampler

fastSample

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

sample

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

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

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

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

Constructor Detail

AbstractFastPreferenceSampler

public AbstractFastPreferenceSampler(FastUserIndex<U> users,
                                     FastItemIndex<I> items)

Constructor.

Parameters:

users - user index

items - item index

Method Detail

numUsers

public int numUsers()

Description copied from interface: UserIndex

Counts the number of indexed users.

Specified by:

numUsers in interface UserIndex<U>

Returns:

the total number of users

numItems

public int numItems()

Description copied from interface: ItemIndex

Counts the number of indexed items.

Specified by:

numItems in interface ItemIndex<I>

Returns:

the total number of item

user2uidx

public int user2uidx(U u)

Description copied from interface: FastUserIndex

Returns the index assigned to the user.

Specified by:

user2uidx in interface FastUserIndex<U>

Parameters:

u - user

Returns:

the index of the user, or -1 if the user does not exist

uidx2user

public U uidx2user(int uidx)

Description copied from interface: FastUserIndex

Returns the user represented with the index.

Specified by:

uidx2user in interface FastUserIndex<U>

Parameters:

uidx - user index

Returns:

the user whose index is uidx

item2iidx

public int item2iidx(I i)

Description copied from interface: FastItemIndex

Returns the index assigned to the item.

Specified by:

item2iidx in interface FastItemIndex<I>

Parameters:

i - item

Returns:

the index of the item, or -1 if the item does not exist

iidx2item

public I iidx2item(int iidx)

Description copied from interface: FastItemIndex

Returns the item represented with the index.

Specified by:

iidx2item in interface FastItemIndex<I>

Parameters:

iidx - item index

Returns:

the item whose index is iidx