| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| package org.apache.lucene.analysis.core; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.nio.file.Path; |
| import org.apache.lucene.analysis.CharArraySet; |
| import org.apache.lucene.analysis.LowerCaseFilter; |
| import org.apache.lucene.analysis.StopFilter; |
| import org.apache.lucene.analysis.StopwordAnalyzerBase; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.Tokenizer; |
| import org.apache.lucene.analysis.WordlistLoader; |
| |
| /** |
| * Filters {@link LetterTokenizer} with {@link LowerCaseFilter} and {@link StopFilter}. |
| * |
| * @since 3.1 |
| */ |
| public final class StopAnalyzer extends StopwordAnalyzerBase { |
| |
| /** |
| * Builds an analyzer with the stop words from the given set. |
| * |
| * @param stopWords Set of stop words |
| */ |
| public StopAnalyzer(CharArraySet stopWords) { |
| super(stopWords); |
| } |
| |
| /** |
| * Builds an analyzer with the stop words from the given path. |
| * |
| * @see WordlistLoader#getWordSet(Reader) |
| * @param stopwordsFile File to load stop words from |
| */ |
| public StopAnalyzer(Path stopwordsFile) throws IOException { |
| this(loadStopwordSet(stopwordsFile)); |
| } |
| |
| /** |
| * Builds an analyzer with the stop words from the given reader. |
| * |
| * @see WordlistLoader#getWordSet(Reader) |
| * @param stopwords Reader to load stop words from |
| */ |
| public StopAnalyzer(Reader stopwords) throws IOException { |
| this(loadStopwordSet(stopwords)); |
| } |
| |
| /** |
| * Creates {@link org.apache.lucene.analysis.Analyzer.TokenStreamComponents} used to tokenize all |
| * the text in the provided {@link Reader}. |
| * |
| * @return {@link org.apache.lucene.analysis.Analyzer.TokenStreamComponents} built from a {@link |
| * LetterTokenizer} filtered with {@link StopFilter} |
| */ |
| @Override |
| protected TokenStreamComponents createComponents(String fieldName) { |
| final Tokenizer source = new LetterTokenizer(); |
| return new TokenStreamComponents( |
| source, new StopFilter(new LowerCaseFilter(source), stopwords)); |
| } |
| |
| @Override |
| protected TokenStream normalize(String fieldName, TokenStream in) { |
| return new LowerCaseFilter(in); |
| } |
| } |