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source: branches/PersistenceReintegration/HeuristicLab.Persistence/3.3/Default/CompositeSerializers/EnumerableSerializer.cs @ 15018

Last change on this file since 15018 was 15018, checked in by gkronber, 7 years ago

#2520 introduced StorableConstructorFlag type for StorableConstructors

File size: 2.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 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.Collections;
24using System.Collections.Generic;
25using System.Reflection;
26using HeuristicLab.Persistence.Auxiliary;
27using HeuristicLab.Persistence.Core;
28using HeuristicLab.Persistence;
29using HeuristicLab.Persistence.Interfaces;
30
31namespace HeuristicLab.Persistence.Default.CompositeSerializers {
32
33  [StorableType("4421c2a4-9ee1-4cfc-b98e-755a81dc5241")]
34  internal sealed class EnumerableSerializer : ICompositeSerializer {
35
36    [StorableConstructor]
37    private EnumerableSerializer(StorableConstructorFlag deserializing) { }
38    public EnumerableSerializer() { }
39
40    public int Priority {
41      get { return 100; }
42    }
43
44
45    public bool CanSerialize(Type type) {
46      return
47        ReflectionTools.HasDefaultConstructor(type) &&
48        type.GetInterface(typeof(IEnumerable).FullName) != null &&
49        type.GetMethod("Add") != null &&
50        type.GetMethod("Add").GetParameters().Length == 1;
51    }
52
53    public string JustifyRejection(Type type) {
54      if (!ReflectionTools.HasDefaultConstructor(type))
55        return "no default constructor";
56      if (type.GetInterface(typeof(IEnumerable).FullName) == null)
57        return "interface IEnumerable not implemented";
58      if (type.GetMethod("Add") == null)
59        return "no 'Add()' method";
60      return "no 'Add()' method with one argument";
61    }
62
63    public IEnumerable<Tag> CreateMetaInfo(object o) {
64      return new Tag[] { };
65    }
66
67    public IEnumerable<Tag> Decompose(object obj) {
68      foreach (object o in (IEnumerable)obj) {
69        yield return new Tag(o);
70      }
71    }
72
73    public object CreateInstance(Type type, IEnumerable<Tag> metaInfo) {
74      return Activator.CreateInstance(type, true);
75    }
76
77    public void Populate(object instance, IEnumerable<Tag> tags, Type type) {
78      MethodInfo addMethod = type.GetMethod("Add");
79      try {
80        foreach (var tag in tags)
81          addMethod.Invoke(instance, new[] { tag.Value });
82      } catch (Exception e) {
83        throw new PersistenceException("Exception caught while trying to populate enumerable.", e);
84      }
85    }
86  }
87}
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