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source: branches/HL-3.2-MonoMigration/HeuristicLab.SimOpt/SimOptSinglePointCrossover.cs @ 3912

Last change on this file since 3912 was 637, checked in by abeham, 16 years ago

[trunk] Redesigned and simplified SimOpt according to ticket #291

File size: 2.5 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 HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Operators;
28using HeuristicLab.Evolutionary;
29
30namespace HeuristicLab.SimOpt {
31  public class SimOptSinglePointCrossover : CrossoverBase {
32
33    public override string Description {
34      get { return @"This operator applies a single point crossover on the variables defined"; }
35    }
36
37    public SimOptSinglePointCrossover()
38      : base() {
39      AddVariableInfo(new VariableInfo("Item", "The item list to be crossed", typeof(ConstrainedItemList), VariableKind.In));
40    }
41
42    protected override void Cross(IScope scope, IRandom random, IScope parent1, IScope parent2, IScope child) {
43      ICollection<IConstraint> violated;
44      ConstrainedItemList p1 = parent1.GetVariableValue<ConstrainedItemList>("Item", false);
45      ConstrainedItemList p2 = parent2.GetVariableValue<ConstrainedItemList>("Item", false);
46
47      if (p1.Count != p2.Count) throw new InvalidOperationException("ERROR: the lists do not contain the same number of items");
48
49      ConstrainedItemList childList = (ConstrainedItemList)p1.Clone();
50      if (childList.Count > 1) {
51        int iter = 0;
52        do {
53          childList.BeginCombinedOperation();
54          int crossPoint = random.Next(1, childList.Count);
55          for (int i = crossPoint; i < childList.Count; i++) {
56            childList.TrySetAt(i, (IItem)p2[i].Clone(), out violated);
57          }
58        } while (!childList.EndCombinedOperation(out violated) && ++iter < 100);
59        if (violated.Count == 0) {
60          child.AddVariable(new Variable(parent1.TranslateName("Item"), childList));
61        }
62      }
63    }
64  }
65}
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