Lucene.Net
3.0.3
Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users.
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core
Analysis
LengthFilter.cs
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using
Lucene.Net.Analysis.Tokenattributes;
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namespace
Lucene.Net.Analysis
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{
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/// <summary>Removes words that are too long or too short from the stream.</summary>
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public
sealed
class
LengthFilter
:
TokenFilter
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{
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internal
int
min;
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internal
int
max;
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private
readonly
ITermAttribute
termAtt;
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/// <summary> Build a filter that removes words that are too long or too
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/// short from the text.
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/// </summary>
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public
LengthFilter
(
TokenStream
in_Renamed,
int
min,
int
max)
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: base(in_Renamed)
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{
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this.min = min;
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this.max = max;
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termAtt = AddAttribute<ITermAttribute>();
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}
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/// <summary> Returns the next input Token whose term() is the right len</summary>
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public
override
bool
IncrementToken()
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{
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// return the first non-stop word found
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while
(input.IncrementToken())
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{
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var len = termAtt.TermLength();
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if
(len >= min && len <= max)
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{
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return
true
;
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}
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// note: else we ignore it but should we index each part of it?
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}
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// reached EOS -- return false
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return
false
;
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}
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}
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}
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