/*
* 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;
}
}
}
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