weka.core.stemmers

Class PTStemmer

java.lang.Object

weka.core.stemmers.PTStemmer

All Implemented Interfaces:

Serializable, weka.core.OptionHandler, weka.core.RevisionHandler, weka.core.stemmers.Stemmer

public class PTStemmer
extends Object
implements weka.core.stemmers.Stemmer, weka.core.OptionHandler

A wrapper for PTStemmer (developed by Pedro Oliveira):
http://code.google.com/p/ptstemmer/

Valid options are:

 -S <ORENGO|PORTER|SAVOY>
  The type of stemmer algorithm to use:
  ORENGO = Orengo
  PORTER = Porter
  SAVOY = Savoy
  (default: ORENGO)

 -N <file>
  The file with the named entities to ignore (optional).
  File format: simple text file with one entity per line.
  (default: none)
 

 -W <file>
  The file with the stopwords (optional).
  File format: simple text file with one stopword per line.
  (default: none)
 

 -C <int>
  The size of the cache. Disable with 0.
  (default: 1000)
 

Version:

$Revision: 1179 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	STEMMER_ORENGO orengo stemmer.
static int	STEMMER_PORTER porter stemmer.
static int	STEMMER_SAVOY savoy stemmer.
static weka.core.Tag[]	TAGS_STEMMERS stemmers.

Constructor Summary

Constructors

Constructor and Description
PTStemmer()

Method Summary

Modifier and Type	Method and Description
String	cacheTipText() Returns the tip text for this property.
int	getCache() Gets the size of the cache.
File	getNamedEntities() Gets the file for the named entities.
String[]	getOptions() Gets the current settings of the classifier.
String	getRevision() Returns the revision string.
weka.core.SelectedTag	getStemmer() Gets the stemmer type to use.
File	getStopwords() Gets the file for the named entities.
String	globalInfo() Returns a string describing the stemmer.
Enumeration	listOptions() Returns an enumeration describing the available options.
static void	main(String[] args) Runs the stemmer with the given options.
String	namedEntitiesTipText() Returns the tip text for this property.
void	setCache(int value) Sets the size of the cache.
void	setNamedEntities(File value) Sets the file for the named entities.
void	setOptions(String[] options) Parses the options.
void	setStemmer(weka.core.SelectedTag value) Sets the stemmer type to use
void	setStopwords(File value) Sets the file for the stopwords.
String	stem(String word) Returns the stemmed version of the given word.
String	stemmerTipText() Returns the tip text for this property
String	stopwordsTipText() Returns the tip text for this property.
String	toString() returns a string representation of the stemmer.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

STEMMER_ORENGO

public static final int STEMMER_ORENGO

orengo stemmer.

See Also:

Constant Field Values

STEMMER_PORTER

public static final int STEMMER_PORTER

porter stemmer.

See Also:

Constant Field Values

STEMMER_SAVOY

public static final int STEMMER_SAVOY

savoy stemmer.

See Also:

Constant Field Values

TAGS_STEMMERS

public static final weka.core.Tag[] TAGS_STEMMERS

stemmers.

Constructor Detail

PTStemmer

public PTStemmer()

Method Detail

globalInfo

public String globalInfo()

Returns a string describing the stemmer.

Returns:

a description suitable for displaying in the explorer/experimenter gui

listOptions

public Enumeration listOptions()

Returns an enumeration describing the available options.

Specified by:

listOptions in interface weka.core.OptionHandler

Returns:

an enumeration of all the available options.

setOptions

public void setOptions(String[] options)
                throws Exception

Parses the options.

Valid options are:

 -S <ORENGO|PORTER|SAVOY>
  The type of stemmer algorithm to use:
  ORENGO = Orengo
  PORTER = Porter
  SAVOY = Savoy
  (default: ORENGO)

 -N <file>
  The file with the named entities to ignore (optional).
  File format: simple text file with one entity per line.
  (default: none)
 

 -W <file>
  The file with the stopwords (optional).
  File format: simple text file with one stopword per line.
  (default: none)
 

 -C <int>
  The size of the cache. Disable with 0.
  (default: 1000)
 

Specified by:

setOptions in interface weka.core.OptionHandler

Parameters:

options - the options to parse

Throws:

Exception - if parsing fails

getOptions

public String[] getOptions()

Gets the current settings of the classifier.

Specified by:

getOptions in interface weka.core.OptionHandler

Returns:

an array of strings suitable for passing to setOptions

setStemmer

public void setStemmer(weka.core.SelectedTag value)

Sets the stemmer type to use

Parameters:

value - the type

getStemmer

public weka.core.SelectedTag getStemmer()

Gets the stemmer type to use.

Returns:

the type

stemmerTipText

public String stemmerTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setNamedEntities

public void setNamedEntities(File value)

Sets the file for the named entities.

Parameters:

value - the file.

getNamedEntities

public File getNamedEntities()

Gets the file for the named entities.

Returns:

the file.

namedEntitiesTipText

public String namedEntitiesTipText()

Returns the tip text for this property.

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setStopwords

public void setStopwords(File value)

Sets the file for the stopwords.

Parameters:

value - the file.

getStopwords

public File getStopwords()

Gets the file for the named entities.

Returns:

the file.

stopwordsTipText

public String stopwordsTipText()

Returns the tip text for this property.

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

setCache

public void setCache(int value)

Sets the size of the cache.

Parameters:

value - the size.

getCache

public int getCache()

Gets the size of the cache.

Returns:

the size.

cacheTipText

public String cacheTipText()

Returns the tip text for this property.

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

stem

public String stem(String word)

Returns the stemmed version of the given word. Word is converted to lower case before stemming.

Specified by:

stem in interface weka.core.stemmers.Stemmer

Parameters:

word - a string consisting of a single word

Returns:

the stemmed word

toString

public String toString()

returns a string representation of the stemmer.

Overrides:

toString in class Object

Returns:

a string representation of the stemmer

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface weka.core.RevisionHandler

Returns:

the revision

main

public static void main(String[] args)

Runs the stemmer with the given options.

Parameters:

args - the options