StandardAnalyzer.cs
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上传日期:2013-09-30
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- /*
- * 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;
- using Lucene.Net.Analysis;
- namespace Lucene.Net.Analysis.Standard
- {
-
- /// <summary> Filters {@link StandardTokenizer} with {@link StandardFilter}, {@link
- /// LowerCaseFilter} and {@link StopFilter}, using a list of English stop words.
- ///
- /// </summary>
- /// <version> $Id: StandardAnalyzer.java 219090 2005-07-14 20:36:28Z dnaber $
- /// </version>
- public class StandardAnalyzer : Analyzer
- {
- private System.Collections.Hashtable stopSet;
-
- /// <summary>An array containing some common English words that are usually not
- /// useful for searching.
- /// </summary>
- public static readonly System.String[] STOP_WORDS;
-
- /// <summary>Builds an analyzer with the default stop words ({@link #STOP_WORDS}). </summary>
- public StandardAnalyzer() : this(STOP_WORDS)
- {
- }
-
- /// <summary>Builds an analyzer with the given stop words. </summary>
- public StandardAnalyzer(System.Collections.Hashtable stopWords)
- {
- stopSet = stopWords;
- }
-
- /// <summary>Builds an analyzer with the given stop words. </summary>
- public StandardAnalyzer(System.String[] stopWords)
- {
- stopSet = StopFilter.MakeStopSet(stopWords);
- }
-
- /// <summary>Builds an analyzer with the stop words from the given file.</summary>
- /// <seealso cref="WordlistLoader.GetWordSet(File)">
- /// </seealso>
- public StandardAnalyzer(System.IO.FileInfo stopwords)
- {
- stopSet = WordlistLoader.GetWordSet(stopwords);
- }
-
- /// <summary>Builds an analyzer with the stop words from the given reader.</summary>
- /// <seealso cref="WordlistLoader.GetWordSet(Reader)">
- /// </seealso>
- public StandardAnalyzer(System.IO.TextReader stopwords)
- {
- stopSet = WordlistLoader.GetWordSet(stopwords);
- }
-
- /// <summary>Constructs a {@link StandardTokenizer} filtered by a {@link
- /// StandardFilter}, a {@link LowerCaseFilter} and a {@link StopFilter}.
- /// </summary>
- public override TokenStream TokenStream(System.String fieldName, System.IO.TextReader reader)
- {
- TokenStream result = new StandardTokenizer(reader);
- result = new StandardFilter(result);
- result = new LowerCaseFilter(result);
- result = new StopFilter(result, stopSet);
- return result;
- }
- static StandardAnalyzer()
- {
- STOP_WORDS = StopAnalyzer.ENGLISH_STOP_WORDS;
- }
- }
- }