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source: stable/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Symbols/Symbol.cs @ 17106

Last change on this file since 17106 was 17097, checked in by mkommend, 5 years ago

#2520: Merged 16565 - 16579 into stable.

File size: 3.6 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 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 System.Collections.Generic;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HEAL.Attic;
27
28namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
29  [StorableType("8ECC852D-3FE4-4AD8-9F70-582C7F874AE6")]
30  [Item("Symbol", "Represents a symbol in a symbolic function tree.")]
31  public abstract class Symbol : NamedItem, ISymbol {
32    #region Properties
33    [Storable]
34    private double initialFrequency;
35    public double InitialFrequency {
36      get { return initialFrequency; }
37      set {
38        if (value < 0.0) throw new ArgumentException("InitialFrequency must be positive");
39        if (value != initialFrequency) {
40          initialFrequency = value;
41          OnChanged(EventArgs.Empty);
42        }
43      }
44    }
45
46    [Storable(DefaultValue = true)]
47    private bool enabled;
48    public virtual bool Enabled {
49      get { return enabled; }
50      set {
51        if (value != enabled) {
52          enabled = value;
53          OnChanged(EventArgs.Empty);
54        }
55      }
56    }
57
58    [Storable(DefaultValue = false)]
59    private bool @fixed;
60    public bool Fixed {
61      get { return @fixed; }
62      set {
63        if (value != @fixed) {
64          @fixed = value;
65          OnChanged(EventArgs.Empty);
66        }
67      }
68    }
69
70    public override bool CanChangeName {
71      get { return !(this is IReadOnlySymbol); }
72    }
73    public override bool CanChangeDescription {
74      get { return false; }
75    }
76
77    public abstract int MinimumArity { get; }
78    public abstract int MaximumArity { get; }
79    #endregion
80
81    [StorableConstructor]
82    protected Symbol(StorableConstructorFlag _) : base(_) { }
83    protected Symbol(Symbol original, Cloner cloner)
84      : base(original, cloner) {
85      initialFrequency = original.initialFrequency;
86      enabled = original.enabled;
87      @fixed = original.@fixed;
88    }
89
90    protected Symbol(string name, string description)
91      : base(name, description) {
92      initialFrequency = 1.0;
93      enabled = true;
94      @fixed = false;
95    }
96
97    [StorableHook(HookType.AfterDeserialization)]
98    private void AfterDeserialization() {
99      // BackwardsCompatibility3.3
100      #region Backwards compatible code, remove with 3.4
101      if (initialFrequency.IsAlmost(0.0) && !(this is GroupSymbol)) enabled = false;
102      #endregion
103
104    }
105
106    public virtual ISymbolicExpressionTreeNode CreateTreeNode() {
107      return new SymbolicExpressionTreeNode(this);
108    }
109
110    public virtual IEnumerable<ISymbol> Flatten() {
111      yield return this;
112    }
113
114    public event EventHandler Changed;
115    protected virtual void OnChanged(EventArgs e) {
116      EventHandler handlers = Changed;
117      if (handlers != null)
118        handlers(this, e);
119    }
120  }
121}
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