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/*
* 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.
*/
using Lucene.Net.Analysis.Tokenattributes;
namespace Lucene.Net.Analysis
{
/// <summary>Normalizes token text to lower case.</summary>
public sealed class LowerCaseFilter:TokenFilter
{
public LowerCaseFilter(TokenStream @in)
: base(@in)
{
termAtt = AddAttribute<ITermAttribute>();
}
private readonly ITermAttribute termAtt;
public override bool IncrementToken()
{
if (input.IncrementToken())
{
char[] buffer = termAtt.TermBuffer();
int length = termAtt.TermLength();
for (int i = 0; i < length; i++)
buffer[i] = System.Char.ToLower(buffer[i]);
return true;
}
return false;
}
}
}
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