package org.apache.lucene.analysis.snowball;
/**
* 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.
*/
import org.apache.lucene.analysis.*;
import org.apache.lucene.analysis.standard.*;
import net.sf.snowball.ext.*;
import java.io.Reader;
import java.util.Set;
/** Filters {@link StandardTokenizer} with {@link StandardFilter}, {@link
* LowerCaseFilter}, {@link StopFilter} and {@link SnowballFilter}.
*
* Available stemmers are listed in {@link net.sf.snowball.ext}. The name of a
* stemmer is the part of the class name before "Stemmer", e.g., the stemmer in
* {@link EnglishStemmer} is named "English".
*/
public class SnowballAnalyzer extends Analyzer {
private String name;
private Set stopSet;
/** Builds the named analyzer with no stop words. */
public SnowballAnalyzer(String name) {
this.name = name;
}
/** Builds the named analyzer with the given stop words. */
public SnowballAnalyzer(String name, String[] stopWords) {
this(name);
stopSet = StopFilter.makeStopSet(stopWords);
}
/** Constructs a {@link StandardTokenizer} filtered by a {@link
StandardFilter}, a {@link LowerCaseFilter} and a {@link StopFilter}. */
public TokenStream tokenStream(String fieldName, Reader reader) {
TokenStream result = new StandardTokenizer(reader);
result = new StandardFilter(result);
result = new LowerCaseFilter(result);
if (stopSet != null)
result = new StopFilter(result, stopSet);
result = new SnowballFilter(result, name);
return result;
}
}
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