| /** |
| * 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.camel.catalog.lucene; |
| |
| import java.io.StringReader; |
| import java.util.Set; |
| |
| import org.apache.camel.catalog.SuggestionStrategy; |
| import org.apache.lucene.analysis.core.KeywordAnalyzer; |
| import org.apache.lucene.index.IndexWriterConfig; |
| import org.apache.lucene.search.spell.PlainTextDictionary; |
| import org.apache.lucene.search.spell.SpellChecker; |
| import org.apache.lucene.store.RAMDirectory; |
| |
| /** |
| * Apache Lucene based {@link SuggestionStrategy}. |
| * <p/> |
| * This is a simple implementation using in-memory directory and no state. |
| */ |
| public class LuceneSuggestionStrategy implements SuggestionStrategy { |
| |
| private int maxSuggestions = 3; |
| |
| @Override |
| public String[] suggestEndpointOptions(Set<String> names, String unknownOption) { |
| // each option must be on a separate line in a String |
| StringBuilder sb = new StringBuilder(); |
| for (String name : names) { |
| sb.append(name); |
| sb.append("\n"); |
| } |
| StringReader reader = new StringReader(sb.toString()); |
| |
| try { |
| PlainTextDictionary words = new PlainTextDictionary(reader); |
| |
| // use in-memory lucene spell checker to make the suggestions |
| RAMDirectory dir = new RAMDirectory(); |
| SpellChecker checker = new SpellChecker(dir); |
| checker.indexDictionary(words, new IndexWriterConfig(new KeywordAnalyzer()), false); |
| |
| return checker.suggestSimilar(unknownOption, maxSuggestions); |
| } catch (Exception e) { |
| // ignore |
| } |
| |
| return null; |
| } |
| |
| } |