#region License Information
/* HeuristicLab
* Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
*
* This file is part of HeuristicLab.
*
* HeuristicLab is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* HeuristicLab is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with HeuristicLab. If not, see .
*/
#endregion
using System;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
namespace HeuristicLab.Encodings.PermutationEncoding {
[Item("ThreeOptPreventEdgeRemoval", "Prevents deleting of previously added edges.")]
[StorableClass]
public class PreventDeleteThreeOptTabuMoveEvaluator : SingleSuccessorOperator, IThreeOptPermutationMoveOperator, ITabuMoveEvaluator {
public override bool CanChangeName {
get { return false; }
}
public ILookupParameter ThreeOptMoveParameter {
get { return (LookupParameter)Parameters["ThreeOptMove"]; }
}
public ILookupParameter PermutationParameter {
get { return (LookupParameter)Parameters["Permutation"]; }
}
public ILookupParameter> TabuListParameter {
get { return (ILookupParameter>)Parameters["TabuList"]; }
}
public ILookupParameter MoveTabuParameter {
get { return (ILookupParameter)Parameters["MoveTabu"]; }
}
private ScopeParameter CurrentScopeParameter {
get { return (ScopeParameter)Parameters["CurrentScope"]; }
}
public PreventDeleteThreeOptTabuMoveEvaluator()
: base() {
Parameters.Add(new LookupParameter("ThreeOptMove", "The move to evaluate."));
Parameters.Add(new LookupParameter("MoveTabu", "The variable to store if a move was tabu."));
Parameters.Add(new LookupParameter("Permutation", "The solution as permutation."));
Parameters.Add(new LookupParameter>("TabuList", "The tabu list."));
Parameters.Add(new ScopeParameter("CurrentScope", "The current scope."));
}
public override IOperation Apply() {
ItemList tabuList = TabuListParameter.ActualValue;
ThreeOptMove move = ThreeOptMoveParameter.ActualValue;
Permutation permutation = PermutationParameter.ActualValue;
int length = permutation.Length;
int E1S = permutation.GetCircular(move.Index1 - 1);
int E1T = permutation[move.Index1];
int E2S = permutation[move.Index2];
int E2T = permutation.GetCircular(move.Index2 + 1);
int E3S, E3T;
if (move.Index3 > move.Index1) {
E3S = permutation.GetCircular(move.Index3 + move.Index2 - move.Index1);
E3T = permutation.GetCircular(move.Index3 + move.Index2 - move.Index1 + 1);
} else {
E3S = permutation.GetCircular(move.Index3 - 1);
E3T = permutation[move.Index3];
}
bool isTabu = (move.Index1 == move.Index3
|| move.Index2 - move.Index1 >= permutation.Length - 2
|| move.Index1 == permutation.Length - 1 && move.Index3 == 0
|| move.Index3 == permutation.Length - 1 && move.Index1 == 0);
if (!isTabu) {
foreach (IItem tabuMove in tabuList) {
ThreeOptTabuMoveAttribute attribute = (tabuMove as ThreeOptTabuMoveAttribute);
if (attribute != null) {
// if previously added Edge3Source-Edge1Target is deleted
if (attribute.Edge3Source == E1S && attribute.Edge1Target == E1T || attribute.Edge3Source == E1T && attribute.Edge1Target == E1S
|| attribute.Edge3Source == E2S && attribute.Edge1Target == E2T || attribute.Edge3Source == E2T && attribute.Edge1Target == E2S
|| attribute.Edge3Source == E3S && attribute.Edge1Target == E3T || attribute.Edge3Source == E3T && attribute.Edge1Target == E3S
// if previously added Edge2Source-Edge3Target is deleted
|| attribute.Edge2Source == E1S && attribute.Edge3Target == E1T || attribute.Edge2Source == E1T && attribute.Edge3Target == E1S
|| attribute.Edge2Source == E2S && attribute.Edge3Target == E2T || attribute.Edge2Source == E2T && attribute.Edge3Target == E2S
|| attribute.Edge2Source == E3S && attribute.Edge3Target == E3T || attribute.Edge2Source == E3T && attribute.Edge3Target == E3S
// if previously added Edge1Source-Edge2Target is deleted
|| attribute.Edge1Source == E1S && attribute.Edge2Target == E1T || attribute.Edge1Source == E1T && attribute.Edge2Target == E1S
|| attribute.Edge1Source == E2S && attribute.Edge2Target == E2T || attribute.Edge1Source == E2T && attribute.Edge2Target == E2S
|| attribute.Edge1Source == E3S && attribute.Edge2Target == E3T || attribute.Edge1Source == E3T && attribute.Edge2Target == E3S) {
isTabu = true;
break;
}
}
}
}
MoveTabuParameter.ActualValue = new BoolValue(isTabu);
return base.Apply();
}
}
}