alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

What this is

This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Other links

The source code

package org.apache.lucene.analysis.ru;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.Reader;
import org.apache.lucene.analysis.CharTokenizer;

/**
 * A RussianLetterTokenizer is a tokenizer that extends LetterTokenizer by additionally looking up letters
 * in a given "russian charset". The problem with LeterTokenizer is that it uses Character.isLetter() method,
 * which doesn't know how to detect letters in encodings like CP1252 and KOI8
 * (well-known problems with 0xD7 and 0xF7 chars)
 *
 * @author  Boris Okner, b.okner@rogers.com
 * @version $Id: RussianLetterTokenizer.java,v 1.3 2004/03/29 22:48:01 cutting Exp $
 */

public class RussianLetterTokenizer extends CharTokenizer
{
    /** Construct a new LetterTokenizer. */
    private char[] charset;

    public RussianLetterTokenizer(Reader in, char[] charset)
    {
        super(in);
        this.charset = charset;
    }

    /**
     * Collects only characters which satisfy
     * {@link Character#isLetter(char)}.
     */
    protected boolean isTokenChar(char c)
    {
        if (Character.isLetter(c))
            return true;
        for (int i = 0; i < charset.length; i++)
        {
            if (c == charset[i])
                return true;
        }
        return false;
    }
}
... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.