/*
* 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.
*/
using System;
using Token = Lucene.Net.Analysis.Token;
using TokenFilter = Lucene.Net.Analysis.TokenFilter;
using TokenStream = Lucene.Net.Analysis.TokenStream;
namespace Lucene.Net.Analysis.RU
{
/// Normalizes token text to lower case, analyzing given ("russian") charset.
///
///
/// Boris Okner, b.okner@rogers.com
///
/// $Id: RussianLowerCaseFilter.java,v 1.4 2004/03/29 22:48:01 cutting Exp $
///
public sealed class RussianLowerCaseFilter : TokenFilter
{
internal char[] charset;
public RussianLowerCaseFilter(TokenStream in_Renamed, char[] charset):base(in_Renamed)
{
this.charset = charset;
}
public override Token Next()
{
Token t = input.Next();
if (t == null)
return null;
System.String txt = t.TermText();
char[] chArray = txt.ToCharArray();
for (int i = 0; i < chArray.Length; i++)
{
chArray[i] = RussianCharsets.ToLowerCase(chArray[i], charset);
}
System.String newTxt = new System.String(chArray);
// create new token
Token newToken = new Token(newTxt, t.StartOffset(), t.EndOffset());
return newToken;
}
}
}