edu.stanford.nlp.process

Class Stemmer

java.lang.Object

edu.stanford.nlp.process.Stemmer

All Implemented Interfaces:

java.util.function.Function<Word,Word>

public class Stemmer
extends java.lang.Object
implements java.util.function.Function<Word,Word>

Stemmer, implementing the Porter Stemming Algorithm
The Stemmer class transforms a word into its root form. The input word can be provided a character at time (by calling add()), or at once by calling one of the various stem(something) methods.

Author:

Sepandar Kamvar (sdkamvar@stanford.edu)

Constructor Summary

Constructors

Constructor and Description
Stemmer()

Method Summary

Modifier and Type	Method and Description
Word	apply(Word word) Stems word (which must be a Word, or else a ClassCastException will be thrown, and returns stemmed Word.
static void	main(java.lang.String[] args) Test program for demonstrating the Stemmer.
java.lang.String	stem(java.lang.String s) Stems s and returns stemmed String.
Word	stem(Word w) Stems w and returns stemmed Word.
java.lang.String	toString() After a word has been stemmed, it can be retrieved by toString(), or a reference to the internal buffer can be retrieved by getResultBuffer and getResultLength (which is generally more efficient.)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

Stemmer

public Stemmer()

Method Detail

toString

public java.lang.String toString()

After a word has been stemmed, it can be retrieved by toString(), or a reference to the internal buffer can be retrieved by getResultBuffer and getResultLength (which is generally more efficient.)

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

Test program for demonstrating the Stemmer. It reads text from a a list of files, stems each word, and writes the result to standard output. Note that the word stemmed is expected to be in lower case: forcing lower case must be done outside the Stemmer class. Usage: Stemmer file-name file-name ...

Throws:

java.io.IOException

stem

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

Stems s and returns stemmed String.

stem

public Word stem(Word w)

Stems w and returns stemmed Word.

apply

public Word apply(Word word)

Stems word (which must be a Word, or else a ClassCastException will be thrown, and returns stemmed Word.

Specified by:

apply in interface java.util.function.Function<Word,Word>