1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using HeuristicLab.Core;
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23 | using HeuristicLab.Data;
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24 | using HeuristicLab.Encodings.BinaryVectorEncoding;
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25 | using HeuristicLab.Parameters;
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26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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27 |
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28 | namespace HeuristicLab.Problems.Knapsack {
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29 | /// <summary>
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30 | /// An operator to evaluate one bitflip moves.
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31 | /// </summary>
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32 | [Item("KnapsackOneBitflipMoveEvaluator", "Base class for evaluating one bitflip moves.")]
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33 | [StorableClass]
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34 | public class KnapsackOneBitflipMoveEvaluator : KnapsackMoveEvaluator, IOneBitflipMoveOperator {
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35 | public ILookupParameter<OneBitflipMove> OneBitflipMoveParameter {
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36 | get { return (ILookupParameter<OneBitflipMove>)Parameters["OneBitflipMove"]; }
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37 | }
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38 |
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39 | public KnapsackOneBitflipMoveEvaluator()
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40 | : base() {
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41 | Parameters.Add(new LookupParameter<OneBitflipMove>("OneBitflipMove", "The move to evaluate."));
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42 | }
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43 |
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44 | public override IOperation Apply() {
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45 | BinaryVector binaryVector = BinaryVectorParameter.ActualValue;
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46 | OneBitflipMove move = OneBitflipMoveParameter.ActualValue;
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47 |
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48 | BinaryVector newSolution = new BinaryVector(binaryVector);
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49 | newSolution[move.Index] = !newSolution[move.Index];
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50 |
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51 | DoubleValue quality = KnapsackEvaluator.Apply(newSolution,
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52 | KnapsackCapacityParameter.ActualValue,
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53 | PenaltyParameter.ActualValue,
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54 | WeightsParameter.ActualValue,
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55 | ValuesParameter.ActualValue).Quality;
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56 |
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57 | double moveQuality = quality.Value;
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58 |
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59 | if (MoveQualityParameter.ActualValue == null) MoveQualityParameter.ActualValue = new DoubleValue(moveQuality);
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60 | else MoveQualityParameter.ActualValue.Value = moveQuality;
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61 | return base.Apply();
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62 | }
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63 | }
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64 | }
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