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source: branches/HeuristicLab.EvolutionTracking/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Creators/SymbolicExpressionTreeCreator.cs @ 11499

Last change on this file since 11499 was 11499, checked in by bburlacu, 8 years ago

#1772: Merged trunk changes.

File size: 4.7 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2014 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Parameters;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
28  /// <summary>
29  /// A base class for operators creating symbolic expression trees.
30  /// </summary>
31  [Item("SymbolicExpressionTreeCreator", "A base class for operators creating symbolic expression trees.")]
32  [StorableClass]
33  public abstract class SymbolicExpressionTreeCreator : SymbolicExpressionTreeOperator, ISymbolicExpressionTreeCreator {
34    private const string SymbolicExpressionTreeParameterName = "SymbolicExpressionTree";
35    private const string SymbolicExpressionTreeGrammarParameterName = "SymbolicExpressionTreeGrammar";
36    private const string ClonedSymbolicExpressionTreeGrammarParameterName = "ClonedSymbolicExpressionTreeGrammar";
37
38    #region Parameter Properties
39    public ILookupParameter<ISymbolicExpressionTree> SymbolicExpressionTreeParameter {
40      get { return (ILookupParameter<ISymbolicExpressionTree>)Parameters[SymbolicExpressionTreeParameterName]; }
41    }
42
43    public IValueLookupParameter<ISymbolicExpressionGrammar> SymbolicExpressionTreeGrammarParameter {
44      get { return (IValueLookupParameter<ISymbolicExpressionGrammar>)Parameters[SymbolicExpressionTreeGrammarParameterName]; }
45    }
46
47    public ILookupParameter<ISymbolicExpressionGrammar> ClonedSymbolicExpressionTreeGrammarParameter {
48      get { return (ILookupParameter<ISymbolicExpressionGrammar>)Parameters[ClonedSymbolicExpressionTreeGrammarParameterName]; }
49    }
50    #endregion
51
52    [StorableConstructor]
53    protected SymbolicExpressionTreeCreator(bool deserializing) : base(deserializing) { }
54    protected SymbolicExpressionTreeCreator(SymbolicExpressionTreeCreator original, Cloner cloner) : base(original, cloner) { }
55    protected SymbolicExpressionTreeCreator()
56      : base() {
57      Parameters.Add(new LookupParameter<ISymbolicExpressionTree>(SymbolicExpressionTreeParameterName, "The symbolic expression tree that should be created."));
58      Parameters.Add(new ValueLookupParameter<ISymbolicExpressionGrammar>(SymbolicExpressionTreeGrammarParameterName,
59        "The tree grammar that defines the correct syntax of symbolic expression trees that should be created."));
60      Parameters.Add(new LookupParameter<ISymbolicExpressionGrammar>(ClonedSymbolicExpressionTreeGrammarParameterName,
61        "An immutable clone of the concrete grammar that is actually used to create and manipulate trees."));
62    }
63
64    [StorableHook(HookType.AfterDeserialization)]
65    private void AfterDeserialization() {
66      if (!Parameters.ContainsKey(ClonedSymbolicExpressionTreeGrammarParameterName))
67        Parameters.Add(new LookupParameter<ISymbolicExpressionGrammar>(ClonedSymbolicExpressionTreeGrammarParameterName, "An immutable clone of the concrete grammar that is actually used to create and manipulate trees."));
68    }
69
70    public override IOperation InstrumentedApply() {
71      if (ClonedSymbolicExpressionTreeGrammarParameter.ActualValue == null) {
72        SymbolicExpressionTreeGrammarParameter.ActualValue.ReadOnly = true;
73        IScope globalScope = ExecutionContext.Scope;
74        while (globalScope.Parent != null)
75          globalScope = globalScope.Parent;
76
77        globalScope.Variables.Add(new Variable(ClonedSymbolicExpressionTreeGrammarParameterName,
78          (ISymbolicExpressionGrammar)SymbolicExpressionTreeGrammarParameter.ActualValue.Clone()));
79      }
80      SymbolicExpressionTreeParameter.ActualValue = Create(Random);
81      return base.InstrumentedApply();
82    }
83
84    protected abstract ISymbolicExpressionTree Create(IRandom random);
85    public abstract ISymbolicExpressionTree CreateTree(IRandom random, ISymbolicExpressionGrammar grammar, int maxTreeLength, int maxTreeDepth);
86  }
87}
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