| 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.Parameters;
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| 25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 26 |
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| 27 | namespace HeuristicLab.Operators {
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| 28 | /// <summary>
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| 29 | /// A branch of two operators which are executed with a specified probability.
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| 30 | /// </summary>
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| 31 | [Item("StochasticBranch", "A branch of two operators which are executed with a specified probability.")]
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| 32 | [StorableClass]
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| 33 | public class StochasticBranch : SingleSuccessorOperator {
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| 34 | public LookupParameter<IRandom> RandomParameter {
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| 35 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
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| 36 | }
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| 37 | public ValueLookupParameter<DoubleValue> ProbabilityParameter {
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| 38 | get { return (ValueLookupParameter<DoubleValue>)Parameters["Probability"]; }
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| 39 | }
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| 40 | protected OperatorParameter FirstBranchParameter {
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| 41 | get { return (OperatorParameter)Parameters["FirstBranch"]; }
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| 42 | }
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| 43 | protected OperatorParameter SecondBranchParameter {
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| 44 | get { return (OperatorParameter)Parameters["SecondBranch"]; }
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| 45 | }
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| 46 | public IOperator FirstBranch {
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| 47 | get { return FirstBranchParameter.Value; }
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| 48 | set { FirstBranchParameter.Value = value; }
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| 49 | }
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| 50 | public IOperator SecondBranch {
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| 51 | get { return SecondBranchParameter.Value; }
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| 52 | set { SecondBranchParameter.Value = value; }
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| 53 | }
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| 54 |
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| 55 | public StochasticBranch()
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| 56 | : base() {
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| 57 | Parameters.Add(new LookupParameter<IRandom>("Random", "A pseudo random number generator."));
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| 58 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Probability", "The probability to execute the first branch."));
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| 59 | Parameters.Add(new OperatorParameter("FirstBranch", "The operator which is executed with the given probability."));
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| 60 | Parameters.Add(new OperatorParameter("SecondBranch", "The operator which is executed if the first branch is not executed."));
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| 61 | }
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| 62 |
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| 63 | public override IOperation Apply() {
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| 64 | OperationCollection next = new OperationCollection(base.Apply());
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| 65 | if (RandomParameter.ActualValue.NextDouble() < ProbabilityParameter.ActualValue.Value) {
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| 66 | if (FirstBranch != null) next.Insert(0, ExecutionContext.CreateOperation(FirstBranch));
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| 67 | } else {
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| 68 | if (SecondBranch != null) next.Insert(0, ExecutionContext.CreateOperation(SecondBranch));
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| 69 | }
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| 70 | return next;
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| 71 | }
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| 72 | }
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| 73 | }
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