| // Lucene version compatibility level 7.1.0 |
| using ICU4N.Text; |
| using Lucene.Net.Analysis.Util; |
| using Lucene.Net.Support; |
| using System; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Analysis.Icu |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// Factory for <see cref="ICUTransformFilter"/>. |
| /// </summary> |
| /// <remarks> |
| /// Supports the following attributes: |
| /// <list type="table"> |
| /// <item><item>id (mandatory)</item><description>A Transliterator ID, one from <see cref="Transliterator.GetAvailableIDs()"/></description>.</item> |
| /// <item><item>direction (optional)</item><description>Either 'forward' or 'reverse'. Default is forward.</description></item> |
| /// </list> |
| /// </remarks> |
| /// <seealso cref="Transliterator"/> |
| [ExceptionToClassNameConvention] |
| public class ICUTransformFilterFactory : TokenFilterFactory, IMultiTermAwareComponent |
| { |
| private readonly Transliterator transliterator; |
| |
| // TODO: add support for custom rules |
| /// <summary>Creates a new <see cref="ICUTransformFilterFactory"/>.</summary> |
| public ICUTransformFilterFactory(IDictionary<string, string> args) |
| : base(args) |
| { |
| string id = Require(args, "id"); |
| string direction = Get(args, "direction", new string[] { "forward", "reverse" }, "forward", false); |
| TransliterationDirection dir = "forward".Equals(direction, StringComparison.Ordinal) ? Transliterator.Forward : Transliterator.Reverse; |
| transliterator = Transliterator.GetInstance(id, dir); |
| if (args.Count != 0) |
| { |
| throw new ArgumentException("Unknown parameters: " + args); |
| } |
| } |
| |
| public override TokenStream Create(TokenStream input) |
| { |
| return new ICUTransformFilter(input, transliterator); |
| } |
| |
| public virtual AbstractAnalysisFactory GetMultiTermComponent() |
| { |
| return this; |
| } |
| } |
| } |