Package es.uam.eps.ir.relison.index.fast

Class FastWeightedPairwiseRelation<W>

java.lang.Object

es.uam.eps.ir.relison.index.fast.FastWeightedRelation<W>

es.uam.eps.ir.relison.index.fast.FastWeightedPairwiseRelation<W>

Type Parameters:

W - Type of the weight.

All Implemented Interfaces:

Relation<W>

public class FastWeightedPairwiseRelation<W>
extends FastWeightedRelation<W>

Fast implementation for a weighted relation. Represented items have indexes between 0 and N-1, where N is the number of items.

Field Summary

Fields inherited from class es.uam.eps.ir.relison.index.fast.FastWeightedRelation

firstIdxList, secondIdxList

Constructor Summary

Constructors

Constructor	Description
FastWeightedPairwiseRelation()	Constructor.
FastWeightedPairwiseRelation(java.util.List<java.util.List<IdxValue<W>>> weightsList)	Constructor.

Method Summary

Modifier and Type	Method	Description
boolean	addSecondItem(int secondIdx)	Adds a new second item to the relation (if it does not previously exist).
java.util.stream.Stream<java.lang.Integer>	getAllSecond()	Gets all the elements of the second type.
int	numSecond()	Gets the total number of elements of the second item in the relation.

Methods inherited from class es.uam.eps.ir.relison.index.fast.FastWeightedRelation

addFirstItem, addRelation, containsPair, firstsWithSeconds, getAllFirst, getIdsFirst, getIdsSecond, getIsolatedFirsts, getIsolatedSeconds, getValue, hasFirsts, hasSeconds, numFirst, numFirst, numSecond, removePair, secondsWithFirsts, updatePair

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.relison.index.Relation

updatePair

Constructor Details

FastWeightedPairwiseRelation

public FastWeightedPairwiseRelation()

Constructor. Builds an empty autorelation.

FastWeightedPairwiseRelation

public FastWeightedPairwiseRelation(java.util.List<java.util.List<IdxValue<W>>> weightsList)

Constructor. Builds an autorelation from previous information.

Parameters:

weightsList - The list of weights.

Method Details

numSecond

public int numSecond()

Description copied from interface: Relation

Gets the total number of elements of the second item in the relation.

Returns:

the number of different elements of the second item in the relation.

getAllSecond

public java.util.stream.Stream<java.lang.Integer> getAllSecond()

Description copied from interface: Relation

Gets all the elements of the second type.

Returns:

A stream containing all the elements.

addSecondItem

public boolean addSecondItem(int secondIdx)

Description copied from interface: Relation

Adds a new second item to the relation (if it does not previously exist).

Parameters:

secondIdx - Identifier of the second item.

Returns:

true if everything went OK, false if it did previously exist, or something went wrong.