source: branches/2839_HiveProjectManagement/HeuristicLab.Encodings.PermutationEncoding/3.3/Moves/Swap2/StochasticSwap2SingleMoveGenerator.cs @ 16057

Last change on this file since 16057 was 16057, checked in by jkarder, 15 months ago

#2839:

File size: 2.7 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 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 HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Optimization;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Encodings.PermutationEncoding {
30  [Item("StochasticSwap2SingleMoveGenerator", "Randomly samples a single from all possible swap-2 moves from a given permutation.")]
31  [StorableClass]
32  public class StochasticSwap2SingleMoveGenerator : Swap2MoveGenerator, IStochasticOperator, ISingleMoveGenerator {
33    public ILookupParameter<IRandom> RandomParameter {
34      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
35    }
36
37    [StorableConstructor]
38    protected StochasticSwap2SingleMoveGenerator(bool deserializing) : base(deserializing) { }
39    protected StochasticSwap2SingleMoveGenerator(StochasticSwap2SingleMoveGenerator original, Cloner cloner) : base(original, cloner) { }
40    public StochasticSwap2SingleMoveGenerator()
41      : base() {
42      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
43    }
44
45    public override IDeepCloneable Clone(Cloner cloner) {
46      return new StochasticSwap2SingleMoveGenerator(this, cloner);
47    }
48
49    public static Swap2Move Apply(Permutation permutation, IRandom random) {
50      int length = permutation.Length;
51      if (length < 2) throw new ArgumentException("StochasticSwap2SingleMoveGenerator: There cannot be a swap-2 move given a permutation of length less than 2.", "permutation");
52      int index1 = random.Next(length), index2 = 0;
53      do {
54        index2 = random.Next(length);
55      } while (index1 == index2);
56      return new Swap2Move(index1, index2);
57    }
58
59    protected override Swap2Move[] GenerateMoves(Permutation permutation) {
60      IRandom random = RandomParameter.ActualValue;
61      return new Swap2Move[] { Apply(permutation, random) };
62    }
63  }
64}
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