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source: branches/PersistenceOverhaul/HeuristicLab.Persistence/4.0/Transformers/EmptyTypeTransformer.cs @ 13326

Last change on this file since 13326 was 13326, checked in by swagner, 7 years ago

#2520: Created plugin for new persistence implementation

File size: 2.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Reflection;
24using HeuristicLab.Persistence.Data;
25
26namespace HeuristicLab.Persistence {
27  [Transformer("A2A2F675-012B-4D50-93A5-B8E728D9809C", 999)]
28  internal sealed class EmptyTypeTransformer : TransformerBase {
29    public override bool CanTransformType(Type type) {
30      while (type != null) {
31        if (type.IsArray) return false;  // arrays are no empty types but contain no fields
32        var fields = type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly);
33        if (fields.Length != 0) return false;
34        type = type.BaseType;
35      }
36      return true;
37    }
38    public override PersistenceData ToData(object o, PersistenceMapper mapper) {
39      var type = o.GetType();
40      var data = new ValueData<ushort>(Id);
41      mapper.Cache(o, data);
42      data.Value = mapper.GetTypeId(type);
43      return data;
44    }
45
46    public override object ToObject(PersistenceData data, PersistenceMapper mapper) {
47      var primitive = (ValueData<ushort>)data;
48      var o = Activator.CreateInstance(mapper.GetType(primitive.Value));
49      mapper.Cache(data, o);
50      return o;
51    }
52  }
53}
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