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source: branches/RefactorPluginInfrastructure-2522/HeuristicLab.Encodings.PermutationEncoding/3.3/Manipulators/InversionManipulator.cs @ 13401

Last change on this file since 13401 was 12012, checked in by ascheibe, 10 years ago

#2212 merged r12008, r12009, r12010 back into trunk

File size: 3.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.Encodings.PermutationEncoding {
27  /// <summary>
28  /// An operator which inverts a randomly chosen part of a permutation.
29  /// </summary>
30  /// <remarks>
31  /// It is implemented as described in Eiben, A.E. and Smith, J.E. 2003. Introduction to Evolutionary Computation. Natural Computing Series, Springer-Verlag Berlin Heidelberg.<br />
32  /// </remarks>
33  [Item("InversionManipulator", "An operator which inverts a randomly chosen part of a permutation. It is implemented as described in Eiben, A.E. and Smith, J.E. 2003. Introduction to Evolutionary Computation. Natural Computing Series, Springer-Verlag Berlin Heidelberg.")]
34  [StorableClass]
35  public class InversionManipulator : PermutationManipulator {
36    [StorableConstructor]
37    protected InversionManipulator(bool deserializing) : base(deserializing) { }
38    protected InversionManipulator(InversionManipulator original, Cloner cloner) : base(original, cloner) { }
39    public InversionManipulator() : base() { }
40
41    public override IDeepCloneable Clone(Cloner cloner) {
42      return new InversionManipulator(this, cloner);
43    }
44
45    /// <summary>
46    /// Inverts a randomly chosen part of a permutation.
47    /// </summary>
48    /// <param name="random">A random number generator.</param>
49    /// <param name="permutation">The permutation to manipulate.</param>
50    public static void Apply(IRandom random, Permutation permutation) {
51      int breakPoint1, breakPoint2;
52
53      breakPoint1 = random.Next(permutation.Length - 1);
54      do {
55        breakPoint2 = random.Next(permutation.Length - 1);
56      } while (breakPoint2 == breakPoint1);
57      if (breakPoint2 < breakPoint1) { int h = breakPoint1; breakPoint1 = breakPoint2; breakPoint2 = h; }
58      Apply(permutation, breakPoint1, breakPoint2);
59    }
60
61    public static void Apply(Permutation permutation, int breakPoint1, int breakPoint2) {
62      for (int i = 0; i <= (breakPoint2 - breakPoint1) / 2; i++) {  // invert permutation between breakpoints
63        int temp = permutation[breakPoint1 + i];
64        permutation[breakPoint1 + i] = permutation[breakPoint2 - i];
65        permutation[breakPoint2 - i] = temp;
66      }
67    }
68
69    /// <summary>
70    /// Inverts a randomly chosen part of a permutation.
71    /// </summary>
72    /// <param name="random">A random number generator.</param>
73    /// <param name="permutation">The permutation to manipulate.</param>
74    protected override void Manipulate(IRandom random, Permutation permutation) {
75      Apply(random, permutation);
76    }
77  }
78}
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