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source: trunk/sources/HeuristicLab.Encodings.PermutationEncoding/3.3/Moves/TwoOpt/PreventReaddInversionMoveTabuChecker.cs @ 3232

Last change on this file since 3232 was 3232, checked in by abeham, 14 years ago

Renamed operators according to the underlying operation #889

File size: 4.4 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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.Core;
24using HeuristicLab.Data;
25using HeuristicLab.Operators;
26using HeuristicLab.Optimization;
27using HeuristicLab.Parameters;
28using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
29
30namespace HeuristicLab.Encodings.PermutationEncoding {
31  [Item("PreventReaddInversionMoveTabuChecker", "Prevents readding of previously deleted edges, but allows deleting previously added edges.")]
32  [StorableClass]
33  public class PreventReaddInversionMoveTabuChecker : SingleSuccessorOperator, IPermutationInversionMoveOperator, ITabuChecker {
34    public override bool CanChangeName {
35      get { return false; }
36    }
37    public ILookupParameter<InversionMove> InversionMoveParameter {
38      get { return (LookupParameter<InversionMove>)Parameters["InversionMove"]; }
39    }
40    public ILookupParameter<Permutation> PermutationParameter {
41      get { return (LookupParameter<Permutation>)Parameters["Permutation"]; }
42    }
43    public ILookupParameter<ItemList<IItem>> TabuListParameter {
44      get { return (ILookupParameter<ItemList<IItem>>)Parameters["TabuList"]; }
45    }
46    public ILookupParameter<BoolValue> MoveTabuParameter {
47      get { return (ILookupParameter<BoolValue>)Parameters["MoveTabu"]; }
48    }
49    private ScopeParameter CurrentScopeParameter {
50      get { return (ScopeParameter)Parameters["CurrentScope"]; }
51    }
52
53    public PreventReaddInversionMoveTabuChecker()
54      : base() {
55      Parameters.Add(new LookupParameter<InversionMove>("InversionMove", "The move to evaluate."));
56      Parameters.Add(new LookupParameter<BoolValue>("MoveTabu", "The variable to store if a move was tabu."));
57      Parameters.Add(new LookupParameter<Permutation>("Permutation", "The solution as permutation."));
58      Parameters.Add(new LookupParameter<ItemList<IItem>>("TabuList", "The tabu list."));
59      Parameters.Add(new ScopeParameter("CurrentScope", "The current scope."));
60    }
61
62    public override IOperation Apply() {
63      ItemList<IItem> tabuList = TabuListParameter.ActualValue;
64      InversionMove move = InversionMoveParameter.ActualValue;
65      Permutation permutation = PermutationParameter.ActualValue;
66      int length = permutation.Length;
67      int E1S = permutation.GetCircular(move.Index1 - 1);
68      int E1T = permutation[move.Index1];
69      int E2S = permutation[move.Index2];
70      int E2T = permutation.GetCircular(move.Index2 + 1);
71      bool isTabu = (move.Index2 - move.Index1 >= length - 2); // doesn't change the solution;
72      if (!isTabu) {
73        foreach (IItem tabuMove in tabuList) {
74          InversionMoveAttribute attribute = (tabuMove as InversionMoveAttribute);
75          if (attribute != null) {
76            // if previously deleted Edge1Source-Target is readded
77            if (attribute.Edge1Source == E1S && attribute.Edge1Target == E2S || attribute.Edge1Source == E2S && attribute.Edge1Target == E1S
78              || attribute.Edge1Source == E1T && attribute.Edge1Target == E2T || attribute.Edge1Source == E2T && attribute.Edge1Target == E1T
79              // if previously deleted Edge2Source-Target is readded
80              || attribute.Edge2Source == E1T && attribute.Edge2Target == E2T || attribute.Edge2Source == E2T && attribute.Edge2Target == E1T
81              || attribute.Edge2Source == E1S && attribute.Edge2Target == E2S || attribute.Edge2Source == E2S && attribute.Edge2Target == E1S) {
82              isTabu = true;
83              break;
84            }
85          }
86        }
87      }
88      MoveTabuParameter.ActualValue = new BoolValue(isTabu);
89      return base.Apply();
90    }
91  }
92}
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