package org.apache.lucene.analysis.ru;/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.lucene.analysis.TokenFilter;import org.apache.lucene.analysis.Token;import org.apache.lucene.analysis.TokenStream;/** * Normalizes token text to lower case, analyzing given ("russian") charset. * * * @version $Id: RussianLowerCaseFilter.java 564236 2007-08-09 15:21:19Z gsingers $ */public final class RussianLowerCaseFilter extends TokenFilter{    char[] charset;    public RussianLowerCaseFilter(TokenStream in, char[] charset)    {        super(in);        this.charset = charset;    }    public final Token next() throws java.io.IOException    {        Token t = input.next();        if (t == null)            return null;        String txt = t.termText();        char[] chArray = txt.toCharArray();        for (int i = 0; i < chArray.length; i++)        {            chArray[i] = RussianCharsets.toLowerCase(chArray[i], charset);        }        String newTxt = new String(chArray);        // create new token        Token newToken = new Token(newTxt, t.startOffset(), t.endOffset());        return newToken;    }}