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source: branches/3.1/sources/HeuristicLab.Data/NullData.cs @ 11082

Last change on this file since 11082 was 82, checked in by swagner, 17 years ago

Fixed ticket #70

  • added new data element NullData for representing a null value
  • used NullData as value for the marker variable in CombinedOperator
File size: 1.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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.Generic;
24using System.Text;
25using System.Xml;
26using HeuristicLab.Core;
27
28namespace HeuristicLab.Data {
29  public class NullData : ObjectData {
30    public override object Data {
31      get { return null; }
32      set { throw new InvalidOperationException("Data property of NullData cannot be set"); }
33    }
34
35    public NullData() {
36      base.Data = null;
37    }
38
39    public override object Clone(IDictionary<Guid, object> clonedObjects) {
40      NullData clone = new NullData();
41      clonedObjects.Add(Guid, clone);
42      return clone;
43    }
44
45    public override void Accept(IObjectDataVisitor visitor) {
46      visitor.Visit(this);
47    }
48  }
49}
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