Package it.unimi.di.big.mg4j.index.cluster

Class FrequencyLexicalStrategy

java.lang.Object

it.unimi.di.big.mg4j.index.cluster.FrequencyLexicalStrategy

All Implemented Interfaces:

LexicalPartitioningStrategy, PartitioningStrategy, Serializable

public class FrequencyLexicalStrategy
extends Object
implements LexicalPartitioningStrategy

A lexical strategy that creates an index containing a subset of the terms.

Author:

Sebastiano Vigna

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
FrequencyLexicalStrategy(LongSet subset)	Creates a new subset lexical strategy.

Method Summary

Modifier and Type	Method	Description
int	localIndex(long globalNumber)	Returns the index to which a given term number is mapped by this strategy.
long	localNumber(long globalNumber)	Returns the local term number given a global term number.
static void	main(String[] arg)
int	numberOfLocalIndices()	Returns the number of local indices created by this strategy.
Properties[]	properties()	Returns an array of properties, one for each local index, that specify additional information about local indices.

Methods inherited from class java.lang.Object

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

Constructor Detail

FrequencyLexicalStrategy

public FrequencyLexicalStrategy(LongSet subset)

Creates a new subset lexical strategy.

Parameters:

subset - the subset of terms.

Method Detail

numberOfLocalIndices

public int numberOfLocalIndices()

Description copied from interface: PartitioningStrategy

Returns the number of local indices created by this strategy.

Specified by:

numberOfLocalIndices in interface PartitioningStrategy

Returns:

the number of local indices created by this strategy.

localIndex

public int localIndex(long globalNumber)

Description copied from interface: LexicalPartitioningStrategy

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

Specified by:

localIndex in interface LexicalPartitioningStrategy

Parameters:

globalNumber - the term global number.

Returns:

the corresponding local index, or -1 if the term should be removed from the partitioned index.

localNumber

public long localNumber(long globalNumber)

Description copied from interface: LexicalPartitioningStrategy

Returns the local term number given a global term number.

Specified by:

localNumber in interface LexicalPartitioningStrategy

Parameters:

globalNumber - a global term number.

Returns:

the corresponding local term number, or -1 if the term should be removed from the partitioned index.

properties

public Properties[] properties()

Description copied from interface: PartitioningStrategy

Returns an array of properties, one for each local index, that specify additional information about local indices.

Specified by:

properties in interface PartitioningStrategy

Returns:

an array of properties, one for each local index; any element can be null (in that case, the set of properties is assumed to be empty).

main

public static void main(String[] arg)
                 throws com.martiansoftware.jsap.JSAPException,
                        IOException,
                        org.apache.commons.configuration.ConfigurationException,
                        SecurityException,
                        URISyntaxException,
                        ClassNotFoundException,
                        InstantiationException,
                        IllegalAccessException,
                        InvocationTargetException,
                        NoSuchMethodException

Throws:

com.martiansoftware.jsap.JSAPException

IOException

org.apache.commons.configuration.ConfigurationException

SecurityException

URISyntaxException

ClassNotFoundException

InstantiationException

IllegalAccessException

InvocationTargetException

NoSuchMethodException