/*
* 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;
namespace Lucene.Net.Analysis{
/// <summary> LowerCaseTokenizer performs the function of LetterTokenizer
/// and LowerCaseFilter together. It divides text at non-letters and converts
/// them to lower case. While it is functionally equivalent to the combination
/// of LetterTokenizer and LowerCaseFilter, there is a performance advantage
/// to doing the two tasks at once, hence this (redundant) implementation.
/// <P>
/// Note: this does a decent job for most European languages, but does a terrible
/// job for some Asian languages, where words are not separated by spaces.
/// </summary>
public sealed class LowerCaseTokenizer : LetterTokenizer
{
/// <summary>Construct a new LowerCaseTokenizer. </summary>
public LowerCaseTokenizer(System.IO.TextReader in_Renamed) : base(in_Renamed)
{
}
/// <summary>Collects only characters which satisfy
/// {@link Character#isLetter(char)}.
/// </summary>
protected internal override char Normalize(char c)
{
return System.Char.ToLower(c);
}
}
}
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