#region License Information /* HeuristicLab * Copyright (C) 2002-2015 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 HeuristicLab.Common; using HeuristicLab.Core; using HeuristicLab.Data; using HeuristicLab.Parameters; using HeuristicLab.Persistence.Default.CompositeSerializers.Storable; namespace HeuristicLab.Operators { /// /// A branch of two operators which are executed with a specified probability. /// [Item("StochasticBranch", "A branch of two operators which are executed with a specified probability.")] [StorableClass] public class StochasticBranch : SingleSuccessorOperator { public LookupParameter RandomParameter { get { return (LookupParameter)Parameters["Random"]; } } public ValueLookupParameter ProbabilityParameter { get { return (ValueLookupParameter)Parameters["Probability"]; } } protected OperatorParameter FirstBranchParameter { get { return (OperatorParameter)Parameters["FirstBranch"]; } } protected OperatorParameter SecondBranchParameter { get { return (OperatorParameter)Parameters["SecondBranch"]; } } public IOperator FirstBranch { get { return FirstBranchParameter.Value; } set { FirstBranchParameter.Value = value; } } public IOperator SecondBranch { get { return SecondBranchParameter.Value; } set { SecondBranchParameter.Value = value; } } [StorableConstructor] protected StochasticBranch(bool deserializing) : base(deserializing) { } protected StochasticBranch(StochasticBranch original, Cloner cloner) : base(original, cloner) { } public StochasticBranch() : base() { Parameters.Add(new LookupParameter("Random", "A pseudo random number generator.")); Parameters.Add(new ValueLookupParameter("Probability", "The probability to execute the first branch.")); Parameters.Add(new OperatorParameter("FirstBranch", "The operator which is executed with the given probability.")); Parameters.Add(new OperatorParameter("SecondBranch", "The operator which is executed if the first branch is not executed.")); } public override IDeepCloneable Clone(Cloner cloner) { return new StochasticBranch(this, cloner); } public override IOperation Apply() { OperationCollection next = new OperationCollection(base.Apply()); if (RandomParameter.ActualValue.NextDouble() < ProbabilityParameter.ActualValue.Value) { if (FirstBranch != null) next.Insert(0, ExecutionContext.CreateOperation(FirstBranch)); } else { if (SecondBranch != null) next.Insert(0, ExecutionContext.CreateOperation(SecondBranch)); } return next; } } }