/*
* 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 System;
using TermAttribute = Lucene.Net.Analysis.Tokenattributes.TermAttribute;
namespace Lucene.Net.Analysis
{
/// Removes words that are too long or too short from the stream.
///
///
///
/// $Id: LengthFilter.java 807201 2009-08-24 13:22:34Z markrmiller $
///
public sealed class LengthFilter:TokenFilter
{
internal int min;
internal int max;
private TermAttribute termAtt;
/// Build a filter that removes words that are too long or too
/// short from the text.
///
public LengthFilter(TokenStream in_Renamed, int min, int max):base(in_Renamed)
{
this.min = min;
this.max = max;
termAtt = (TermAttribute) AddAttribute(typeof(TermAttribute));
}
/// Returns the next input Token whose term() is the right len
public override bool IncrementToken()
{
// return the first non-stop word found
while (input.IncrementToken())
{
int len = termAtt.TermLength();
if (len >= min && len <= max)
{
return true;
}
// note: else we ignore it but should we index each part of it?
}
// reached EOS -- return null
return false;
}
}
}