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.Common;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Data;
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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.Operators {
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29 | /// <summary>
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30 | /// A branch of two operators which are executed with a specified probability.
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31 | /// </summary>
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32 | [Item("StochasticBranch", "A branch of two operators which are executed with a specified probability.")]
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33 | [StorableClass]
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34 | public class StochasticBranch : SingleSuccessorOperator {
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35 | public LookupParameter<IRandom> RandomParameter {
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36 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
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37 | }
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38 | public ValueLookupParameter<DoubleValue> ProbabilityParameter {
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39 | get { return (ValueLookupParameter<DoubleValue>)Parameters["Probability"]; }
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40 | }
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41 | protected OperatorParameter FirstBranchParameter {
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42 | get { return (OperatorParameter)Parameters["FirstBranch"]; }
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43 | }
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44 | protected OperatorParameter SecondBranchParameter {
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45 | get { return (OperatorParameter)Parameters["SecondBranch"]; }
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46 | }
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47 | public IOperator FirstBranch {
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48 | get { return FirstBranchParameter.Value; }
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49 | set { FirstBranchParameter.Value = value; }
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50 | }
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51 | public IOperator SecondBranch {
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52 | get { return SecondBranchParameter.Value; }
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53 | set { SecondBranchParameter.Value = value; }
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54 | }
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55 |
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56 | [StorableConstructor]
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57 | protected StochasticBranch(bool deserializing) : base(deserializing) { }
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58 | protected StochasticBranch(StochasticBranch original, Cloner cloner)
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59 | : base(original, cloner) {
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60 | }
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61 | public StochasticBranch()
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62 | : base() {
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63 | Parameters.Add(new LookupParameter<IRandom>("Random", "A pseudo random number generator."));
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64 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Probability", "The probability to execute the first branch."));
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65 | Parameters.Add(new OperatorParameter("FirstBranch", "The operator which is executed with the given probability."));
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66 | Parameters.Add(new OperatorParameter("SecondBranch", "The operator which is executed if the first branch is not executed."));
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67 | }
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68 |
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69 | public override IDeepCloneable Clone(Cloner cloner) {
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70 | return new StochasticBranch(this, cloner);
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71 | }
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72 |
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73 | public override IOperation Apply(IExecutionContext context) {
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74 | OperationCollection next = new OperationCollection(base.Apply(context));
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75 | if (RandomParameter.ActualValue.NextDouble() < ProbabilityParameter.ActualValue.Value) {
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76 | if (FirstBranch != null) next.Insert(0, context.CreateOperation(FirstBranch));
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77 | } else {
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78 | if (SecondBranch != null) next.Insert(0, context.CreateOperation(SecondBranch));
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79 | }
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80 | return next;
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81 | }
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82 | }
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83 | }
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