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source: trunk/sources/HeuristicLab.Permutation/3.2/PermutationCrossoverBase.cs @ 2107

Last change on this file since 2107 was 1530, checked in by gkronber, 16 years ago

Moved source files of plugins Hive ... Visualization.Test into version-specific sub-folders. #576

File size: 3.2 KB
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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.Evolutionary;
27
28namespace HeuristicLab.Permutation {
29  /// <summary>
30  /// Base class for all permutation crossover operators.
31  /// </summary>
32  public abstract class PermutationCrossoverBase : CrossoverBase {
33    /// <summary>
34    /// Initializes a new instance of <see cref="PermutationCrossoverBase"/> with one variable info
35    /// (<c>Permutation</c>).
36    /// </summary>
37    public PermutationCrossoverBase()
38      : base() {
39      AddVariableInfo(new VariableInfo("Permutation", "Parent and child permutations", typeof(Permutation), VariableKind.In | VariableKind.New));
40    }
41
42    /// <summary>
43    /// Performs a crossover by calling <see cref="Cross(HeuristicLab.Core.IScope, HeuristicLab.Core.IRandom, int[][]"/>
44    /// and adds the created permutation to the current scope.
45    /// </summary>
46    /// <exception cref="InvalidOperationException">Thrown if the parents have different lengths.</exception>
47    /// <param name="scope">The current scope which represents a new child.</param>
48    /// <param name="random">A random number generator.</param>
49    protected sealed override void Cross(IScope scope, IRandom random) {
50      int[][] parents = new int[scope.SubScopes.Count][];
51      int length = -1;
52      for (int i = 0; i < scope.SubScopes.Count; i++) {
53        parents[i] = scope.SubScopes[i].GetVariableValue<Permutation>("Permutation", false).Data;
54        if (i == 0) length = parents[i].Length;
55        else if (parents[i].Length != length) throw new InvalidOperationException("ERROR in PermutationCrossoverBase: Cannot apply crossover to permutations of different length");
56      }
57
58      int[] result = Cross(scope, random, parents);
59      scope.AddVariable(new Variable(scope.TranslateName("Permutation"), new Permutation(result)));
60    }
61
62    /// <summary>
63    /// Performs a crossover of multiple permutations.
64    /// </summary>
65    /// <param name="scope">The current scope.</param>
66    /// <param name="random">A random number generator.</param>
67    /// <param name="parents">An array containing all parent permutations.</param>
68    /// <returns>The newly created permutation, resulting from the crossover operation.</returns>
69    protected abstract int[] Cross(IScope scope, IRandom random, int[][] parents);
70  }
71}
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