PersianNormalizationFilter.cs

Go to the documentation of this file.

/*
 *
 * 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.Fa
{
    /*
 * A {@link TokenFilter} that applies {@link PersianNormalizer} to normalize the
 * orthography.
 * 
 */

public sealed class PersianNormalizationFilter : TokenFilter {

  private readonly PersianNormalizer normalizer;
  private readonly ITermAttribute termAtt;

  public PersianNormalizationFilter(TokenStream input) 
      :base(input)
  {
    normalizer = new PersianNormalizer();
    termAtt = AddAttribute<ITermAttribute>();
  }

  public override bool IncrementToken()
{
    if (input.IncrementToken()) {
      int newlen = normalizer.Normalize(termAtt.TermBuffer(), termAtt.TermLength());
      termAtt.SetTermLength(newlen);
      return true;
    } 
    return false;
  }
}
}