Last change
on this file since 8084 was
82,
checked in by swagner, 16 years ago
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Fixed ticket #70
- added new data element NullData for representing a null value
- used NullData as value for the marker variable in CombinedOperator
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File size:
1.5 KB
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1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Text;
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25 | using System.Xml;
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26 | using HeuristicLab.Core;
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27 |
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28 | namespace HeuristicLab.Data {
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29 | public class NullData : ObjectData {
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30 | public override object Data {
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31 | get { return null; }
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32 | set { throw new InvalidOperationException("Data property of NullData cannot be set"); }
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33 | }
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34 |
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35 | public NullData() {
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36 | base.Data = null;
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37 | }
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38 |
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39 | public override object Clone(IDictionary<Guid, object> clonedObjects) {
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40 | NullData clone = new NullData();
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41 | clonedObjects.Add(Guid, clone);
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42 | return clone;
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43 | }
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44 |
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45 | public override void Accept(IObjectDataVisitor visitor) {
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46 | visitor.Visit(this);
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47 | }
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48 | }
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49 | }
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