source: trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Crossovers/SymbolicExpressionTreeCrossover.cs @ 9456

Last change on this file since 9456 was 9456, checked in by swagner, 6 years ago

Updated copyright year and added some missing license headers (#1889)

File size: 3.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2013 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
22using System;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Parameters;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
29  /// <summary>
30  /// A base class for operators that perform a crossover of symbolic expression trees.
31  /// </summary>
32  [Item("SymbolicExpressionTreeCrossover", "A base class for operators that perform a crossover of symbolic expression trees.")]
33  [StorableClass]
34  public abstract class SymbolicExpressionTreeCrossover : SymbolicExpressionTreeOperator, ISymbolicExpressionTreeCrossover {
35    private const string ParentsParameterName = "Parents";
36    private const string ChildParameterName = "Child";
37    #region Parameter Properties
38    public ILookupParameter<ItemArray<ISymbolicExpressionTree>> ParentsParameter {
39      get { return (ScopeTreeLookupParameter<ISymbolicExpressionTree>)Parameters[ParentsParameterName]; }
40    }
41    public ILookupParameter<ISymbolicExpressionTree> ChildParameter {
42      get { return (ILookupParameter<ISymbolicExpressionTree>)Parameters[ChildParameterName]; }
43    }
44    #endregion
45    #region Properties
46    public ItemArray<ISymbolicExpressionTree> Parents {
47      get { return ParentsParameter.ActualValue; }
48    }
49    public ISymbolicExpressionTree Child {
50      get { return ChildParameter.ActualValue; }
51      set { ChildParameter.ActualValue = value; }
52    }
53    #endregion
54    [StorableConstructor]
55    protected SymbolicExpressionTreeCrossover(bool deserializing) : base(deserializing) { }
56    protected SymbolicExpressionTreeCrossover(SymbolicExpressionTreeCrossover original, Cloner cloner) : base(original, cloner) { }
57    protected SymbolicExpressionTreeCrossover()
58      : base() {
59      Parameters.Add(new ScopeTreeLookupParameter<ISymbolicExpressionTree>(ParentsParameterName, "The parent symbolic expression trees which should be crossed."));
60      Parameters.Add(new LookupParameter<ISymbolicExpressionTree>(ChildParameterName, "The child symbolic expression tree resulting from the crossover."));
61      ParentsParameter.ActualName = "SymbolicExpressionTree";
62      ChildParameter.ActualName = "SymbolicExpressionTree";
63    }
64
65    public sealed override IOperation Apply() {
66      if (Parents.Length != 2)
67        throw new ArgumentException("Number of parents must be exactly two for symbolic expression tree crossover operators.");
68
69      ISymbolicExpressionTree result = Crossover(Random, Parents[0], Parents[1]);
70
71      Child = result;
72      return base.Apply();
73    }
74
75    public abstract ISymbolicExpressionTree Crossover(IRandom random, ISymbolicExpressionTree parent0, ISymbolicExpressionTree parent1);
76  }
77}
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