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 System;
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23 | using System.Collections.Generic;
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24 | using System.Drawing;
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25 | using System.Linq;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Core;
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28 | using HeuristicLab.Data;
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29 | using HeuristicLab.Encodings.BinaryVectorEncoding;
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30 | using HeuristicLab.Optimization;
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31 | using HeuristicLab.Parameters;
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32 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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33 | using HeuristicLab.PluginInfrastructure;
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34 |
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35 | namespace HeuristicLab.Problems.Knapsack {
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36 | [Item("Knapsack", "Represents a Knapsack Problem.")]
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37 | [Creatable("Problems")]
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38 | [StorableClass]
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39 | public sealed class Knapsack : ParameterizedNamedItem, ISingleObjectiveProblem {
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40 | public override Image ItemImage {
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41 | get { return HeuristicLab.Common.Resources.VS2008ImageLibrary.Type; }
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42 | }
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43 |
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44 | #region Parameter Properties
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45 | public ValueParameter<BoolValue> MaximizationParameter {
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46 | get { return (ValueParameter<BoolValue>)Parameters["Maximization"]; }
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47 | }
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48 | IParameter ISingleObjectiveProblem.MaximizationParameter {
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49 | get { return MaximizationParameter; }
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50 | }
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51 | public ValueParameter<IntValue> KnapsackCapacityParameter {
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52 | get { return (ValueParameter<IntValue>)Parameters["KnapsackCapacity"]; }
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53 | }
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54 | public ValueParameter<DoubleValue> PenaltyParameter {
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55 | get { return (ValueParameter<DoubleValue>)Parameters["Penalty"]; }
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56 | }
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57 | public ValueParameter<IntArray> WeightsParameter {
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58 | get { return (ValueParameter<IntArray>)Parameters["Weights"]; }
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59 | }
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60 | public ValueParameter<IntArray> ValuesParameter {
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61 | get { return (ValueParameter<IntArray>)Parameters["Values"]; }
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62 | }
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63 | public ValueParameter<IBinaryVectorCreator> SolutionCreatorParameter {
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64 | get { return (ValueParameter<IBinaryVectorCreator>)Parameters["SolutionCreator"]; }
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65 | }
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66 | IParameter IProblem.SolutionCreatorParameter {
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67 | get { return SolutionCreatorParameter; }
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68 | }
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69 | public ValueParameter<IKnapsackEvaluator> EvaluatorParameter {
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70 | get { return (ValueParameter<IKnapsackEvaluator>)Parameters["Evaluator"]; }
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71 | }
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72 | IParameter IProblem.EvaluatorParameter {
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73 | get { return EvaluatorParameter; }
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74 | }
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75 | public OptionalValueParameter<DoubleValue> BestKnownQualityParameter {
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76 | get { return (OptionalValueParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
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77 | }
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78 | IParameter ISingleObjectiveProblem.BestKnownQualityParameter {
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79 | get { return BestKnownQualityParameter; }
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80 | }
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81 | #endregion
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82 |
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83 | #region Properties
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84 | public IBinaryVectorCreator SolutionCreator {
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85 | get { return SolutionCreatorParameter.Value; }
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86 | set { SolutionCreatorParameter.Value = value; }
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87 | }
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88 | ISolutionCreator IProblem.SolutionCreator {
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89 | get { return SolutionCreatorParameter.Value; }
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90 | }
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91 | public IKnapsackEvaluator Evaluator {
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92 | get { return EvaluatorParameter.Value; }
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93 | set { EvaluatorParameter.Value = value; }
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94 | }
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95 | ISingleObjectiveEvaluator ISingleObjectiveProblem.Evaluator {
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96 | get { return EvaluatorParameter.Value; }
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97 | }
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98 | IEvaluator IProblem.Evaluator {
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99 | get { return EvaluatorParameter.Value; }
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100 | }
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101 | public DoubleValue BestKnownQuality {
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102 | get { return BestKnownQualityParameter.Value; }
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103 | set { BestKnownQualityParameter.Value = value; }
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104 | }
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105 | private List<IBinaryVectorOperator> operators;
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106 | public IEnumerable<IOperator> Operators {
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107 | get { return operators.Cast<IOperator>(); }
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108 | }
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109 | #endregion
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110 |
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111 | public Knapsack()
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112 | : base() {
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113 | RandomBinaryVectorCreator creator = new RandomBinaryVectorCreator();
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114 | KnapsackEvaluator evaluator = new KnapsackEvaluator();
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115 |
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116 | Parameters.Add(new ValueParameter<BoolValue>("Maximization", "Set to true as the Knapsack Problem is a maximization problem.", new BoolValue(true)));
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117 | Parameters.Add(new ValueParameter<IntValue>("KnapsackCapacity", "Capacity of the Knapsack.", new IntValue(0)));
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118 | Parameters.Add(new ValueParameter<IntArray>("Weights", "The weights of the items.", new IntArray(5)));
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119 | WeightsParameter.ActualValue.ToStringChanged += new EventHandler(WeightsActualValue_ToStringChanged);
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120 | Parameters.Add(new ValueParameter<IntArray>("Values", "The values of the items.", new IntArray(5)));
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121 | ValuesParameter.ActualValue.ToStringChanged += new EventHandler(ValuesActualValue_ToStringChanged);
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122 | Parameters.Add(new ValueParameter<DoubleValue>("Penalty", "The penalty value for each unit of overweight.", new DoubleValue(1)));
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123 | Parameters.Add(new ValueParameter<IBinaryVectorCreator>("SolutionCreator", "The operator which should be used to create new Knapsack solutions.", creator));
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124 | Parameters.Add(new ValueParameter<IKnapsackEvaluator>("Evaluator", "The operator which should be used to evaluate Knapsack solutions.", evaluator));
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125 | Parameters.Add(new OptionalValueParameter<DoubleValue>("BestKnownQuality", "The quality of the best known solution of this Knapsack instance."));
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126 |
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127 | creator.BinaryVectorParameter.ActualName = "KnapsackSolution";
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128 | evaluator.QualityParameter.ActualName = "NumberOfOnes";
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129 | ParameterizeSolutionCreator();
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130 | ParameterizeEvaluator();
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131 |
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132 | Initialize();
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133 | }
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134 |
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135 | [StorableConstructor]
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136 | private Knapsack(bool deserializing) : base() { }
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137 |
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138 | public override IDeepCloneable Clone(Cloner cloner) {
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139 | Knapsack clone = (Knapsack)base.Clone(cloner);
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140 | clone.Initialize();
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141 | return clone;
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142 | }
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143 |
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144 | #region Events
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145 | public event EventHandler SolutionCreatorChanged;
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146 | private void OnSolutionCreatorChanged() {
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147 | if (SolutionCreatorChanged != null)
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148 | SolutionCreatorChanged(this, EventArgs.Empty);
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149 | }
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150 | public event EventHandler EvaluatorChanged;
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151 | private void OnEvaluatorChanged() {
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152 | if (EvaluatorChanged != null)
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153 | EvaluatorChanged(this, EventArgs.Empty);
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154 | }
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155 | public event EventHandler OperatorsChanged;
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156 | private void OnOperatorsChanged() {
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157 | if (OperatorsChanged != null)
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158 | OperatorsChanged(this, EventArgs.Empty);
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159 | }
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160 |
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161 | private void SolutionCreatorParameter_ValueChanged(object sender, EventArgs e) {
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162 | SolutionCreator.BinaryVectorParameter.ActualNameChanged += new EventHandler(SolutionCreator_PermutationParameter_ActualNameChanged);
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163 | ParameterizeSolutionCreator();
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164 | ParameterizeEvaluator();
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165 | ParameterizeOperators();
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166 | OnSolutionCreatorChanged();
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167 | }
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168 | private void SolutionCreator_PermutationParameter_ActualNameChanged(object sender, EventArgs e) {
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169 | ParameterizeEvaluator();
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170 | ParameterizeOperators();
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171 | }
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172 | private void EvaluatorParameter_ValueChanged(object sender, EventArgs e) {
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173 | ParameterizeEvaluator();
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174 | OnEvaluatorChanged();
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175 | }
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176 |
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177 | void ValuesActualValue_ToStringChanged(object sender, EventArgs e) {
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178 | ParameterizeSolutionCreator();
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179 | }
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180 |
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181 | void WeightsActualValue_ToStringChanged(object sender, EventArgs e) {
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182 | ParameterizeSolutionCreator();
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183 | }
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184 | #endregion
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185 |
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186 | #region Helpers
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187 | [StorableHook(HookType.AfterDeserialization)]
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188 | private void Initialize() {
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189 | InitializeOperators();
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190 | SolutionCreatorParameter.ValueChanged += new EventHandler(SolutionCreatorParameter_ValueChanged);
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191 | SolutionCreator.BinaryVectorParameter.ActualNameChanged += new EventHandler(SolutionCreator_PermutationParameter_ActualNameChanged);
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192 | EvaluatorParameter.ValueChanged += new EventHandler(EvaluatorParameter_ValueChanged);
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193 | }
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194 | private void ParameterizeSolutionCreator() {
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195 | if(SolutionCreator.LengthParameter.Value == null ||
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196 | SolutionCreator.LengthParameter.Value.Value != WeightsParameter.Value.Length)
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197 | SolutionCreator.LengthParameter.Value = new IntValue(WeightsParameter.Value.Length);
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198 | }
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199 | private void ParameterizeEvaluator() {
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200 | if (Evaluator is KnapsackEvaluator) {
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201 | KnapsackEvaluator knapsackEvaluator =
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202 | (KnapsackEvaluator)Evaluator;
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203 | knapsackEvaluator.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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204 | knapsackEvaluator.WeightsParameter.ActualName = WeightsParameter.Name;
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205 | knapsackEvaluator.ValuesParameter.ActualName = ValuesParameter.Name;
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206 | knapsackEvaluator.KnapsackCapacityParameter.ActualName = KnapsackCapacityParameter.Name;
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207 | knapsackEvaluator.PenaltyParameter.ActualName = PenaltyParameter.Name;
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208 | }
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209 | }
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210 | private void InitializeOperators() {
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211 | operators = new List<IBinaryVectorOperator>();
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212 | if (ApplicationManager.Manager != null) {
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213 | operators.AddRange(ApplicationManager.Manager.GetInstances<IBinaryVectorOperator>());
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214 | ParameterizeOperators();
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215 | }
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216 | }
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217 | private void ParameterizeOperators() {
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218 | foreach (IBinaryVectorCrossover op in Operators.OfType<IBinaryVectorCrossover>()) {
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219 | op.ParentsParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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220 | op.ChildParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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221 | }
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222 | foreach (IBinaryVectorManipulator op in Operators.OfType<IBinaryVectorManipulator>()) {
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223 | op.BinaryVectorParameter.ActualName = SolutionCreator.BinaryVectorParameter.ActualName;
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224 | }
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225 | }
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226 | #endregion
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227 | }
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228 | }
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