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

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

All Implemented Interfaces:

SimpleStemmer, WVTStemmer, TokenEnumeration

Direct Known Subclasses:

AbstractWordNetStemmer, DictionaryStemmer, DummyStemmer, LovinsStemmerWrapper, PorterStemmerWrapper, SnowballStemmerWrapper, ToLowerCaseConverter

public abstract class AbstractStemmer
extends java.lang.Object
implements WVTStemmer, SimpleStemmer, TokenEnumeration

An abstract stemmer.

Version:

$Id$

Author:

Michael Wurst

Field Summary

private TokenEnumeration

source

Constructor Summary

AbstractStemmer()

Method Summary

abstract java.lang.String	getBase(java.lang.String s) Produce the base form of a given term.
boolean	hasMoreTokens() Determine whether there are tokens left in the Enumeration.
java.lang.String	nextToken() Return the next token from the stream.
TokenEnumeration	stem(TokenEnumeration source, WVTDocumentInfo d) Convert a list of tokens to a list of stems.

Methods inherited from class java.lang.Object

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

Field Detail

source

private TokenEnumeration source

Constructor Detail

AbstractStemmer

public AbstractStemmer()

Method Detail

stem

public TokenEnumeration stem(TokenEnumeration source,
                             WVTDocumentInfo d)
                      throws WVToolException

Description copied from interface: WVTStemmer

Convert a list of tokens to a list of stems.

Specified by:

stem in interface WVTStemmer

Parameters:

source - the original stream of tokens

d - the WVTDocumentInfo value that describes the document being processed

Returns:

the resulting stream of tokens

Throws:

WVToolException

nextToken

public java.lang.String nextToken()
                           throws WVToolException

Description copied from interface: TokenEnumeration

Return the next token from the stream.

Specified by:

nextToken in interface TokenEnumeration

Returns:

a String value, or null if there are no more tokens

Throws:

WVToolException

getBase

public abstract 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

Parameters:

s - a term

Returns:

the base form of the term

hasMoreTokens

public boolean hasMoreTokens()

Description copied from interface: TokenEnumeration

Determine whether there are tokens left in the Enumeration. If an error occurs, false is returned.

Specified by:

hasMoreTokens in interface TokenEnumeration

Returns:

a boolean value