| using J2N.Numerics; |
| using Lucene.Net.Codecs; |
| using Lucene.Net.Store; |
| using Lucene.Net.Support; |
| 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> |
| /// n-gram connection cost data |
| /// </summary> |
| public sealed class ConnectionCosts |
| { |
| public static readonly string FILENAME_SUFFIX = ".dat"; |
| public static readonly string HEADER = "kuromoji_cc"; |
| public static readonly int VERSION = 1; |
| |
| private readonly short[][] costs; // array is backward IDs first since get is called using the same backward ID consecutively. maybe doesn't matter. |
| |
| private ConnectionCosts() |
| { |
| short[][] costs = null; |
| |
| using (Stream @is = BinaryDictionary.GetTypeResource(GetType(), FILENAME_SUFFIX)) |
| { |
| DataInput @in = new InputStreamDataInput(@is); |
| CodecUtil.CheckHeader(@in, HEADER, VERSION, VERSION); |
| int forwardSize = @in.ReadVInt32(); |
| int backwardSize = @in.ReadVInt32(); |
| costs = RectangularArrays.ReturnRectangularArray<short>(backwardSize, forwardSize); |
| int accum = 0; |
| for (int j = 0; j < costs.Length; j++) |
| { |
| short[] a = costs[j]; |
| for (int i = 0; i < a.Length; i++) |
| { |
| int raw = @in.ReadVInt32(); |
| accum += raw.TripleShift(1) ^ -(raw & 1); |
| a[i] = (short)accum; |
| } |
| } |
| } |
| |
| this.costs = costs; |
| } |
| |
| public int Get(int forwardId, int backwardId) |
| { |
| return costs[backwardId][forwardId]; |
| } |
| |
| public static ConnectionCosts Instance => SingletonHolder.INSTANCE; |
| |
| private class SingletonHolder |
| { |
| internal static readonly ConnectionCosts INSTANCE = LoadInstance(); |
| private static ConnectionCosts LoadInstance() // LUCENENET: Avoid static constructors (see https://github.com/apache/lucenenet/pull/224#issuecomment-469284006) |
| { |
| try |
| { |
| return new ConnectionCosts(); |
| } |
| catch (IOException ioe) |
| { |
| throw new Exception("Cannot load ConnectionCosts.", ioe); |
| } |
| } |
| } |
| } |
| } |