es.uam.eps.ir.ranksys.core.index

Interface ItemIndex<I>

Type Parameters:

I - type of the items

All Known Subinterfaces:

FastFeatureData<I,F,V>, FastItemIndex<I>, FastPointWisePreferenceData<U,I>, FastPreferenceData<U,I>, FastPreferenceSampler<U,I>, FastRecommender<U,I>, FeatureData<I,F,V>, PointWisePreferenceData<U,I>, PreferenceData<U,I>, PreferenceSampler<U,I>

All Known Implementing Classes:

AbstractCODECPreferenceData, AbstractFastFeatureData, AbstractFastPreferenceData, AbstractFastPreferenceSampler, AbstractFastRecommender, BinaryCODECPreferenceData, CachedItemNeighborhood, ConcatPreferenceData, Factorization, FastEnsembleRecommender, FastRankingRecommender, FMRecommender, InvertedItemNeighborhood, ItemNeighborhood, ItemNeighborhoodRecommender, ItemSimilarity, IteratorsAbstractFastPreferenceData, LDARecommender, MFRecommender, PopularityRecommender, PreferenceFM, RandomRecommender, RatingCODECPreferenceData, RerankingRecommender, SetCosineItemSimilarity, SetJaccardItemSimilarity, SimpleFastFeatureData, SimpleFastItemIndex, SimpleFastPreferenceData, SimpleFeatureData, SimplePreferenceData, StreamsAbstractFastPreferenceData, ThresholdItemNeighborhood, TopKItemNeighborhood, TransposedPreferenceData, UserNeighborhoodRecommender, VectorCosineItemSimilarity, VectorJaccardItemSimilarity

public interface ItemIndex<I>

Index for a set of items.

Author:

Saúl Vargas (saul.vargas@uam.es)

Method Summary

Modifier and Type	Method and Description
boolean	containsItem(I i) Checks whether the index contains an item.
Stream<I>	getAllItems() Retrieves a stream of the indexed items.
int	numItems() Counts the number of indexed items.

Method Detail

containsItem

boolean containsItem(I i)

Checks whether the index contains an item.

Parameters:

i - item

Returns:

true if the index contains the item, false otherwise

numItems

int numItems()

Counts the number of indexed items.

Returns:

the total number of item

getAllItems

Stream<I> getAllItems()

Retrieves a stream of the indexed items.

Returns:

a stream of all the items