| /** |
| * 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.jena.query.text.analyzer ; |
| |
| import java.lang.reflect.Constructor; |
| import java.util.Hashtable; |
| import java.util.List ; |
| import java.lang.reflect.InvocationTargetException; |
| |
| import org.apache.jena.atlas.logging.Log; |
| import org.apache.jena.query.text.TextIndexException; |
| import org.apache.jena.query.text.assembler.GenericFilterAssembler.FilterSpec; |
| import org.apache.jena.query.text.assembler.GenericTokenizerAssembler.TokenizerSpec; |
| import org.apache.jena.query.text.assembler.TextVocab; |
| import org.apache.lucene.analysis.Analyzer ; |
| import org.apache.lucene.analysis.TokenFilter ; |
| import org.apache.lucene.analysis.Tokenizer ; |
| import org.apache.lucene.analysis.TokenStream ; |
| import org.apache.lucene.analysis.core.KeywordTokenizer ; |
| import org.apache.lucene.analysis.core.LetterTokenizer; |
| import org.apache.lucene.analysis.core.LowerCaseFilter ; |
| import org.apache.lucene.analysis.core.WhitespaceTokenizer ; |
| import org.apache.lucene.analysis.miscellaneous.ASCIIFoldingFilter; |
| import org.apache.lucene.analysis.standard.StandardTokenizer; |
| |
| /** |
| * Lucene Analyzer implementation that can be configured with different |
| * Tokenizer and (optionally) TokenFilter implementations. |
| */ |
| |
| @SuppressWarnings("deprecation") |
| public class ConfigurableAnalyzer extends Analyzer { |
| private final String tokenizer; |
| private final List<String> filters; |
| |
| private static Hashtable<String, FilterSpec> filterSpecs = new Hashtable<>(); |
| private static Hashtable<String, TokenizerSpec> tokenizerSpecs = new Hashtable<>(); |
| |
| static{ |
| Class<?>[] paramClasses = new Class<?>[0]; |
| Object[] paramValues = new Object[0]; |
| |
| tokenizerSpecs.put(TextVocab.NS+"KeywordTokenizer", new TokenizerSpec(KeywordTokenizer.class, paramClasses, paramValues)); |
| tokenizerSpecs.put(TextVocab.NS+"LetterTokenizer", new TokenizerSpec(LetterTokenizer.class, paramClasses, paramValues)); |
| tokenizerSpecs.put(TextVocab.NS+"StandardTokenizer", new TokenizerSpec(StandardTokenizer.class, paramClasses, paramValues)); |
| tokenizerSpecs.put(TextVocab.NS+"WhitespaceTokenizer", new TokenizerSpec(WhitespaceTokenizer.class, paramClasses, paramValues)); |
| |
| paramClasses = new Class<?>[] {TokenStream.class}; |
| paramValues = new Object[]{ null }; |
| |
| filterSpecs.put(TextVocab.NS+"ASCIIFoldingFilter", new FilterSpec(ASCIIFoldingFilter.class, paramClasses, paramValues)); |
| filterSpecs.put(TextVocab.NS+"LowerCaseFilter", new FilterSpec(LowerCaseFilter.class, paramClasses, paramValues)); |
| } |
| |
| public static void defineFilter(String id, FilterSpec spec) { |
| filterSpecs.put(id, spec); |
| } |
| |
| public static void defineTokenizer(String id, TokenizerSpec spec) { |
| tokenizerSpecs.put(id, spec); |
| } |
| |
| /** |
| * Create instance of a Lucene Tokenizer, <code>class</code>, with provided parameters |
| * |
| * @param clazz The analyzer class |
| * @param paramClasses The parameter classes |
| * @param paramValues The parameter values |
| * @return The lucene analyzer |
| */ |
| private Tokenizer newTokenizer(Class<?> clazz, Class<?>[] paramClasses, Object[] paramValues) { |
| |
| String className = clazz.getName(); |
| |
| try { |
| final Constructor<?> cstr = clazz.getDeclaredConstructor(paramClasses); |
| |
| return (Tokenizer) cstr.newInstance(paramValues); |
| |
| } catch (IllegalArgumentException | IllegalAccessException | InstantiationException | InvocationTargetException | SecurityException e) { |
| Log.error(this, "Exception while instantiating tokenizer class " + className + ". " + e.getMessage(), e); |
| } catch (NoSuchMethodException ex) { |
| Log.error(this, "Could not find matching tokenizer class constructor for " + className + " " + ex.getMessage(), ex); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Create instance of the Lucene Analyzer, <code>class</code>, with provided parameters |
| * |
| * @param clazz The analyzer class |
| * @param paramClasses The parameter classes |
| * @param paramValues The parameter values |
| * @return The lucene analyzer |
| */ |
| private TokenFilter newFilter(Class<?> clazz, Class<?>[] paramClasses, Object[] paramValues) { |
| |
| String className = clazz.getName(); |
| |
| try { |
| final Constructor<?> cstr = clazz.getDeclaredConstructor(paramClasses); |
| |
| return (TokenFilter) cstr.newInstance(paramValues); |
| |
| } catch (IllegalArgumentException | IllegalAccessException | InstantiationException | InvocationTargetException | SecurityException e) { |
| Log.error(this, "Exception while instantiating analyzer class " + className + ". " + e.getMessage(), e); |
| } catch (NoSuchMethodException ex) { |
| Log.error(this, "Could not find matching analyzer class constructor for " + className + " " + ex.getMessage(), ex); |
| } |
| |
| return null; |
| } |
| |
| private Tokenizer getTokenizer(String tokenizerName) { |
| TokenizerSpec spec = tokenizerSpecs.get(tokenizerName); |
| if (spec == null) { |
| throw new TextIndexException("Unknown tokenizer : " + tokenizerName); |
| } |
| |
| Class<?> clazz = spec.clazz; |
| Class<?>[] paramClasses = spec.paramClasses; |
| Object[] paramValues = spec.paramValues; |
| |
| return newTokenizer(clazz, paramClasses, paramValues); |
| } |
| |
| private TokenFilter getTokenFilter(String filterName, TokenStream source) { |
| FilterSpec spec = filterSpecs.get(filterName); |
| |
| if (spec == null) { |
| throw new TextIndexException("Unknown filter : " + filterName); |
| } |
| |
| Class<?> clazz = spec.clazz; |
| Class<?>[] paramClasses = spec.paramClasses; |
| Object[] paramValues = spec.paramValues; |
| |
| // the source should always be the first parameter |
| paramValues[0] = source; |
| |
| return newFilter(clazz, paramClasses, paramValues); |
| } |
| |
| public ConfigurableAnalyzer(String tokenizer, List<String> filters) { |
| this.tokenizer = tokenizer; |
| this.filters = filters; |
| } |
| |
| @Override |
| protected TokenStreamComponents createComponents(String fieldName) { |
| Tokenizer source = getTokenizer(this.tokenizer); |
| TokenStream stream = source; |
| for (String filter : this.filters) { |
| stream = getTokenFilter(filter, stream); |
| } |
| return new TokenStreamComponents(source, stream); |
| } |
| |
| @Override |
| protected TokenStream normalize(String fieldName, TokenStream in) { |
| TokenStream stream = in; |
| for (String filter : this.filters) { |
| stream = getTokenFilter(filter, stream); |
| } |
| return stream; |
| } |
| |
| } |