CJKAnalyzer.java
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上传日期:2022-03-14
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- //package org.apache.lucene.analysis.cjk;
- /**
- * 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 chapter8;
- import org.apache.lucene.analysis.Analyzer;
- import org.apache.lucene.analysis.StopFilter;
- import org.apache.lucene.analysis.TokenStream;
- import java.io.Reader;
- import java.util.Set;
- /**
- * Filters CJKTokenizer with StopFilter.
- *
- * @author Che, Dong
- */
- public class CJKAnalyzer extends Analyzer {
- //~ Static fields/initializers ---------------------------------------------
- /**
- * An array containing some common English words that are not usually
- * useful for searching and some double-byte interpunctions.
- */
- public final static String[] STOP_WORDS = {
- "a", "and", "are", "as", "at", "be",
- "but", "by", "for", "if", "in",
- "into", "is", "it", "no", "not",
- "of", "on", "or", "s", "such", "t",
- "that", "the", "their", "then",
- "there", "these", "they", "this",
- "to", "was", "will", "with", "",
- "www"
- };
- //~ Instance fields --------------------------------------------------------
- /**
- * stop word list
- */
- private Set stopTable;
- //~ Constructors -----------------------------------------------------------
- /**
- * Builds an analyzer which removes words in {@link #STOP_WORDS}.
- */
- public CJKAnalyzer() {
- stopTable = StopFilter.makeStopSet(STOP_WORDS);
- }
- /**
- * Builds an analyzer which removes words in the provided array.
- *
- * @param stopWords stop word array
- */
- public CJKAnalyzer(String[] stopWords) {
- stopTable = StopFilter.makeStopSet(stopWords);
- }
- //~ Methods ----------------------------------------------------------------
- /**
- * get token stream from input
- *
- * @param fieldName lucene field name
- * @param reader input reader
- * @return TokenStream
- */
- public final TokenStream tokenStream(String fieldName, Reader reader) {
- return new StopFilter(new CJKTokenizer(reader), stopTable);
- }
- }