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LengthFilter.cs
Package: xunlong0.6.rar [view]
Upload User: zhangkuixh
Upload Date: 2013-09-30
Package Size: 5473k
Code Size: 2k
Category:
Search Engine
Development Platform:
C#
- /*
- * 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> Removes words that are too long and too short from the stream.
- ///
- /// </summary>
- /// <author> David Spencer
- /// </author>
- /// <version> $Id: LengthFilter.java 347992 2005-11-21 21:41:43Z dnaber $
- /// </version>
- public sealed class LengthFilter : TokenFilter
- {
- internal int min;
- internal int max;
- /// <summary> Build a filter that removes words that are too long or too
- /// short from the text.
- /// </summary>
- public LengthFilter(TokenStream in_Renamed, int min, int max) : base(in_Renamed)
- {
- this.min = min;
- this.max = max;
- }
- /// <summary> Returns the next input Token whose termText() is the right len</summary>
- public override Token Next()
- {
- // return the first non-stop word found
- for (Token token = input.Next(); token != null; token = input.Next())
- {
- int len = token.TermText().Length;
- if (len >= min && len <= max)
- {
- return token;
- }
- // note: else we ignore it but should we index each part of it?
- }
- // reached EOS -- return null
- return null;
- }
- }
- }