1  #region License Information


2  /* HeuristicLab


3  * Copyright (C) 20022015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)


4  *


5  * This file is part of HeuristicLab.


6  *


7  * HeuristicLab is free software: you can redistribute it and/or modify


8  * it under the terms of the GNU General Public License as published by


9  * the Free Software Foundation, either version 3 of the License, or


10  * (at your option) any later version.


11  *


12  * HeuristicLab is distributed in the hope that it will be useful,


13  * but WITHOUT ANY WARRANTY; without even the implied warranty of


14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the


15  * GNU General Public License for more details.


16  *


17  * You should have received a copy of the GNU General Public License


18  * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.


19  */


20  #endregion


21 


22  using HeuristicLab.Common;


23  using HeuristicLab.Core;


24  using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;


25  using HeuristicLab.Operators;


26  using HeuristicLab.Parameters;


27  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;


28 


29  namespace HeuristicLab.Problems.DataAnalysis.Symbolic {


30  [Item("SymbolicExpressionTreeSimplificationOperator", "Simplifies symbolic expression trees encoding a mathematical formula.")]


31  [StorableClass]


32  public class SymbolicDataAnalysisExpressionTreeSimplificationOperator : SingleSuccessorOperator, ISymbolicExpressionTreeOperator {


33  private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";


34 


35  public ILookupParameter<ISymbolicExpressionTree> SymbolicExpressionTreeParameter {


36  get { return (ILookupParameter<ISymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }


37  }


38 


39  private readonly SymbolicDataAnalysisExpressionTreeSimplifier simplifier = new SymbolicDataAnalysisExpressionTreeSimplifier();


40 


41  [StorableConstructor]


42  protected SymbolicDataAnalysisExpressionTreeSimplificationOperator(bool deserializing) : base(deserializing) { }


43  protected SymbolicDataAnalysisExpressionTreeSimplificationOperator(SymbolicDataAnalysisExpressionTreeSimplificationOperator original, Cloner cloner)


44  : base(original, cloner) { }


45  public override IDeepCloneable Clone(Cloner cloner) {


46  return new SymbolicDataAnalysisExpressionTreeSimplificationOperator(this, cloner);


47  }


48 


49  public SymbolicDataAnalysisExpressionTreeSimplificationOperator() {


50  Parameters.Add(new LookupParameter<ISymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression tree to simplify."));


51  }


52 


53  public override IOperation Apply() {


54  var tree = SymbolicExpressionTreeParameter.ActualValue;


55  var simplifiedTree = simplifier.Simplify(tree);


56  simplifiedTree = simplifier.Simplify(simplifiedTree);


57  SymbolicExpressionTreeParameter.ActualValue = simplifiedTree;


58 


59  return base.Apply();


60  }


61  }


62  }

