it.unimi.di.mg4j.index.cluster
Interface LexicalClusteringStrategy

All Superinterfaces:

ClusteringStrategy, Serializable

All Known Implementing Classes:

ChainedLexicalClusteringStrategy, ContiguousLexicalStrategy

public interface LexicalClusteringStrategy
extends ClusteringStrategy

A way to associate a term with a local index out of a given set.

A LexicalCluster needs a way to retrieve, given a term, the corresponding local index.

Author:

Alessandro Arrabito, Sebastiano Vigna

See Also:

LexicalPartitioningStrategy

Method Summary

int	globalNumber(int localIndex, int localNumber) Returns the global term number given a local index and a local term number (optional operation).
int	localIndex(CharSequence term) Returns the index to which a given term is be mapped by this strategy.

Methods inherited from interface it.unimi.di.mg4j.index.cluster.ClusteringStrategy

numberOfLocalIndices

Method Detail

localIndex

int localIndex(CharSequence term)

Returns the index to which a given term is be mapped by this strategy.

Parameters:

term - a term.

Returns:

the corresponding local index, or -1 if no index contains the term.

globalNumber

int globalNumber(int localIndex,
                 int localNumber)

Returns the global term number given a local index and a local term number (optional operation).

This operation is not, in general, necessary for a LexicalCluster to work, as no action on a local index returns local numbers. It is defined here mainly for completeness and for debugging purposes (in case it is implemented).

Parameters:

localIndex - the local index.

localNumber - the local term number.

Returns:

the global term number.