| /* |
| * 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.solr.analysis; |
| |
| import java.io.Reader; |
| |
| import org.apache.lucene.analysis.Analyzer; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.Tokenizer; |
| import org.apache.lucene.analysis.core.KeywordTokenizer; |
| import org.apache.lucene.analysis.custom.CustomAnalyzer; |
| import org.apache.lucene.analysis.util.CharFilterFactory; |
| import org.apache.lucene.analysis.util.TokenFilterFactory; |
| import org.apache.lucene.analysis.util.TokenizerFactory; |
| |
| /** |
| * An analyzer that uses a tokenizer and a list of token filters to |
| * create a TokenStream. |
| * |
| * It should probably be replaced with {@link CustomAnalyzer}. |
| * @since 3.1 |
| */ |
| public final class TokenizerChain extends SolrAnalyzer { |
| private static final CharFilterFactory[] EMPTY_CHAR_FITLERS = new CharFilterFactory[0]; |
| private static final TokenFilterFactory[] EMPTY_TOKEN_FITLERS = new TokenFilterFactory[0]; |
| |
| final private CharFilterFactory[] charFilters; |
| final private TokenizerFactory tokenizer; |
| final private TokenFilterFactory[] filters; |
| |
| /** Copy from CustomAnalyzer. */ |
| public TokenizerChain(CustomAnalyzer customAnalyzer) { |
| this( |
| customAnalyzer.getCharFilterFactories().toArray(new CharFilterFactory[0]), |
| customAnalyzer.getTokenizerFactory(), |
| customAnalyzer.getTokenFilterFactories().toArray(new TokenFilterFactory[0])); |
| setPositionIncrementGap(customAnalyzer.getPositionIncrementGap(null)); |
| setVersion(customAnalyzer.getVersion()); |
| assert customAnalyzer.getOffsetGap(null) == 1; // note: we don't support setting the offset gap |
| } |
| |
| /** |
| * Creates a new TokenizerChain w/o any CharFilterFactories. |
| * |
| * @param tokenizer Factory for the Tokenizer to use, must not be null. |
| * @param filters Factories for the TokenFilters to use - if null, will be treated as if empty. |
| */ |
| public TokenizerChain(TokenizerFactory tokenizer, TokenFilterFactory[] filters) { |
| this(null,tokenizer,filters); |
| } |
| |
| /** |
| * Creates a new TokenizerChain. |
| * |
| * @param charFilters Factories for the CharFilters to use, if any - if null, will be treated as if empty. |
| * @param tokenizer Factory for the Tokenizer to use, must not be null. |
| * @param filters Factories for the TokenFilters to use if any- if null, will be treated as if empty. |
| */ |
| public TokenizerChain(CharFilterFactory[] charFilters, TokenizerFactory tokenizer, TokenFilterFactory[] filters) { |
| charFilters = null == charFilters ? EMPTY_CHAR_FITLERS : charFilters; |
| filters = null == filters ? EMPTY_TOKEN_FITLERS : filters; |
| if (null == tokenizer) { |
| throw new NullPointerException("TokenizerFactory must not be null"); |
| } |
| |
| this.charFilters = charFilters; |
| this.tokenizer = tokenizer; |
| this.filters = filters; |
| } |
| |
| /** @return array of CharFilterFactories, may be empty but never null */ |
| public CharFilterFactory[] getCharFilterFactories() { return charFilters; } |
| /** @return the TokenizerFactory in use, will never be null */ |
| public TokenizerFactory getTokenizerFactory() { return tokenizer; } |
| /** @return array of TokenFilterFactories, may be empty but never null */ |
| public TokenFilterFactory[] getTokenFilterFactories() { return filters; } |
| |
| @Override |
| public Reader initReader(String fieldName, Reader reader) { |
| if (charFilters != null && charFilters.length > 0) { |
| Reader cs = reader; |
| for (CharFilterFactory charFilter : charFilters) { |
| cs = charFilter.create(cs); |
| } |
| reader = cs; |
| } |
| return reader; |
| } |
| |
| @Override |
| protected Reader initReaderForNormalization(String fieldName, Reader reader) { |
| if (charFilters != null && charFilters.length > 0) { |
| for (CharFilterFactory charFilter : charFilters) { |
| reader = charFilter.normalize(reader); |
| } |
| } |
| return reader; |
| } |
| |
| @Override |
| protected TokenStreamComponents createComponents(String fieldName) { |
| Tokenizer tk = tokenizer.create(attributeFactory(fieldName)); |
| TokenStream ts = tk; |
| for (TokenFilterFactory filter : filters) { |
| ts = filter.create(ts); |
| } |
| return new TokenStreamComponents(tk, ts); |
| } |
| |
| @Override |
| protected TokenStream normalize(String fieldName, TokenStream in) { |
| TokenStream result = in; |
| for (TokenFilterFactory filter : filters) { |
| result = filter.normalize(result); |
| } |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder("TokenizerChain("); |
| for (CharFilterFactory filter: charFilters) { |
| sb.append(filter); |
| sb.append(", "); |
| } |
| sb.append(tokenizer); |
| for (TokenFilterFactory filter: filters) { |
| sb.append(", "); |
| sb.append(filter); |
| } |
| sb.append(')'); |
| return sb.toString(); |
| } |
| |
| public Analyzer getMultiTermAnalyzer() { |
| return new Analyzer() { |
| @Override |
| protected TokenStreamComponents createComponents(String fieldName) { |
| Tokenizer tk = new KeywordTokenizer(); |
| TokenStream ts = tk; |
| for (TokenFilterFactory filter : filters) { |
| ts = filter.normalize(ts); |
| } |
| return new TokenStreamComponents(tk, ts); |
| } |
| |
| @Override |
| protected Reader initReader(String fieldName, Reader reader) { |
| if (charFilters != null && charFilters.length > 0) { |
| Reader cs = reader; |
| for (CharFilterFactory charFilter : charFilters) { |
| cs = charFilter.normalize(cs); |
| } |
| reader = cs; |
| } |
| return reader; |
| } |
| }; |
| } |
| |
| } |