edu.udo.cs.wvtool.generic.stemmer
Class AbstractWordNetStemmer

java.lang.Object
  edu.udo.cs.wvtool.generic.stemmer.AbstractStemmer
      edu.udo.cs.wvtool.generic.stemmer.AbstractWordNetStemmer

All Implemented Interfaces:

SimpleStemmer, WVTStemmer, TokenEnumeration

Direct Known Subclasses:

WordNetHypernymStemmer, WordNetSynonymStemmer

public abstract class AbstractWordNetStemmer
extends AbstractStemmer

An abstract stemming class using the wordnet dicitionary. Subclasses control which word form is derived from the base form. The prerequisite for using any subclass of this class is an installation of WordNet 2.1. Also, you need to provide the parameter -Dwvtool.wnconfig= to your program, where is a configuration file for the JWNL system. An example for such a file can be found in the sample directory. For more information refer to the JWNL project. http://jwordnet.sourceforge.net

Version:

$Id$

Author:

Michael Wurst

Field Summary

private net.didion.jwnl.dictionary.Dictionary	dictionary
private int	maxSenses
private SimpleStemmer	stemmer

Constructor Summary

AbstractWordNetStemmer()

AbstractWordNetStemmer(SimpleStemmer stemmer, int maxSenses)

Method Summary

java.lang.String	getBase(java.lang.String s) Produce the base form of a given term.
protected net.didion.jwnl.data.IndexWord	getIndexWord(java.lang.String s)
protected abstract java.lang.String	getWordForm(net.didion.jwnl.data.IndexWord word) Obtain a derived form of the specified word.

Methods inherited from class edu.udo.cs.wvtool.generic.stemmer.AbstractStemmer

hasMoreTokens, nextToken, stem

Methods inherited from class java.lang.Object

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

Field Detail

dictionary

private final net.didion.jwnl.dictionary.Dictionary dictionary

stemmer

private final SimpleStemmer stemmer

maxSenses

private final int maxSenses

Constructor Detail

AbstractWordNetStemmer

public AbstractWordNetStemmer(SimpleStemmer stemmer,
                              int maxSenses)

AbstractWordNetStemmer

public AbstractWordNetStemmer()

Method Detail

getIndexWord

protected net.didion.jwnl.data.IndexWord getIndexWord(java.lang.String s)
                                               throws net.didion.jwnl.JWNLException

Throws:

net.didion.jwnl.JWNLException

getWordForm

protected abstract java.lang.String getWordForm(net.didion.jwnl.data.IndexWord word)
                                         throws net.didion.jwnl.JWNLException

Obtain a derived form of the specified word.

Parameters:

word - a word

Returns:

a String representig the derived form

Throws:

net.didion.jwnl.JWNLException

getBase

public java.lang.String getBase(java.lang.String s)

Description copied from interface: SimpleStemmer

Produce the base form of a given term.

Specified by:

getBase in interface SimpleStemmer

Specified by:

getBase in class AbstractStemmer

Parameters:

s - a term

Returns:

the base form of the term