| using Lucene.Net.Store; |
| using Lucene.Net.Util.Fst; |
| using System; |
| using System.IO; |
| |
| namespace Lucene.Net.Analysis.Ja.Dict |
| { |
| /* |
| * 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> |
| /// Binary dictionary implementation for a known-word dictionary model: |
| /// Words are encoded into an FST mapping to a list of wordIDs. |
| /// </summary> |
| public sealed class TokenInfoDictionary : BinaryDictionary |
| { |
| public static readonly string FST_FILENAME_SUFFIX = "$fst.dat"; |
| |
| private readonly TokenInfoFST fst; |
| |
| private TokenInfoDictionary() |
| { |
| FST<long?> fst = null; |
| using (Stream @is = GetResource(FST_FILENAME_SUFFIX)) |
| { |
| fst = new FST<long?>(new InputStreamDataInput(@is), PositiveInt32Outputs.Singleton); |
| } |
| // TODO: some way to configure? |
| this.fst = new TokenInfoFST(fst, true); |
| } |
| |
| public TokenInfoFST FST => fst; |
| |
| public static TokenInfoDictionary Instance => SingletonHolder.INSTANCE; |
| |
| private class SingletonHolder |
| { |
| internal static readonly TokenInfoDictionary INSTANCE = LoadInstance(); |
| private static TokenInfoDictionary LoadInstance() // LUCENENET: Avoid static constructors (see https://github.com/apache/lucenenet/pull/224#issuecomment-469284006) |
| { |
| try |
| { |
| return new TokenInfoDictionary(); |
| } |
| catch (IOException ioe) |
| { |
| throw new Exception("Cannot load TokenInfoDictionary.", ioe); |
| } |
| } |
| } |
| } |
| } |