source: trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Grammars/EmptySymbolicExpressionTreeGrammar.cs @ 11494

Last change on this file since 11494 was 11494, checked in by mkommend, 3 years ago

#2268: Moved all grammar classes into a new folder. Added new EmptySymbolicExpressionTreeGrammar which is immutable and forwards all calls to the default grammar object.

File size: 4.7 KB
Line 
1#region License Information
2
3/* HeuristicLab
4 * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
5 *
6 * This file is part of HeuristicLab.
7 *
8 * HeuristicLab is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * HeuristicLab is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#endregion
23
24using System;
25using System.Collections.Generic;
26using System.Linq;
27using HeuristicLab.Common;
28using HeuristicLab.Core;
29
30namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
31  internal sealed class EmptySymbolicExpressionTreeGrammar : NamedItem, ISymbolicExpressionTreeGrammar {
32    private ISymbolicExpressionGrammar grammar;
33    internal EmptySymbolicExpressionTreeGrammar(ISymbolicExpressionGrammar grammar)
34      : base() {
35      if (grammar == null) throw new ArgumentNullException();
36      this.grammar = grammar;
37    }
38
39    public override IDeepCloneable Clone(Cloner cloner) {
40      return this;
41    }
42
43    public IEnumerable<ISymbol> Symbols {
44      get { return grammar.Symbols; }
45    }
46    public IEnumerable<ISymbol> AllowedSymbols {
47      get { return grammar.AllowedSymbols; }
48    }
49
50    public ISymbol GetSymbol(string symbolName) {
51      return grammar.GetSymbol(symbolName);
52    }
53
54    public bool ContainsSymbol(ISymbol symbol) {
55      return grammar.ContainsSymbol(symbol);
56    }
57
58    public bool IsAllowedChildSymbol(ISymbol parent, ISymbol child) {
59      return grammar.IsAllowedChildSymbol(parent, child);
60    }
61    public bool IsAllowedChildSymbol(ISymbol parent, ISymbol child, int argumentIndex) {
62      return grammar.IsAllowedChildSymbol(parent, child, argumentIndex);
63    }
64
65    IEnumerable<ISymbol> ISymbolicExpressionGrammarBase.GetAllowedChildSymbols(ISymbol parent) {
66      return grammar.GetAllowedChildSymbols(parent);
67    }
68
69    IEnumerable<ISymbol> ISymbolicExpressionGrammarBase.GetAllowedChildSymbols(ISymbol parent, int argumentIndex) {
70      return grammar.GetAllowedChildSymbols(parent, argumentIndex);
71    }
72
73    public int GetMinimumSubtreeCount(ISymbol symbol) {
74      return grammar.GetMinimumSubtreeCount(symbol);
75    }
76    public int GetMaximumSubtreeCount(ISymbol symbol) {
77      return grammar.GetMaximumSubtreeCount(symbol);
78    }
79
80    int ISymbolicExpressionGrammarBase.GetMinimumExpressionDepth(ISymbol symbol) {
81      return grammar.GetMinimumExpressionDepth(symbol);
82    }
83    int ISymbolicExpressionGrammarBase.GetMaximumExpressionDepth(ISymbol symbol) {
84      return grammar.GetMaximumExpressionDepth(symbol);
85    }
86    int ISymbolicExpressionGrammarBase.GetMinimumExpressionLength(ISymbol symbol) {
87      return grammar.GetMinimumExpressionLength(symbol);
88    }
89    int ISymbolicExpressionGrammarBase.GetMaximumExpressionLength(ISymbol symbol, int maxDepth) {
90      return grammar.GetMaximumExpressionLength(symbol, maxDepth);
91    }
92
93
94    #region ISymbolicExpressionTreeGrammar Members
95    IEnumerable<ISymbol> ISymbolicExpressionTreeGrammar.ModifyableSymbols {
96      get { return Enumerable.Empty<ISymbol>(); }
97    }
98
99    bool ISymbolicExpressionTreeGrammar.IsModifyableSymbol(ISymbol symbol) {
100      return false;
101    }
102
103    void ISymbolicExpressionTreeGrammar.AddSymbol(ISymbol symbol) {
104      throw new NotSupportedException();
105    }
106
107    void ISymbolicExpressionTreeGrammar.RemoveSymbol(ISymbol symbol) {
108      throw new NotSupportedException();
109    }
110
111    void ISymbolicExpressionTreeGrammar.AddAllowedChildSymbol(ISymbol parent, ISymbol child) {
112      throw new NotSupportedException();
113    }
114
115    void ISymbolicExpressionTreeGrammar.AddAllowedChildSymbol(ISymbol parent, ISymbol child, int argumentIndex) {
116      throw new NotSupportedException();
117    }
118
119    void ISymbolicExpressionTreeGrammar.RemoveAllowedChildSymbol(ISymbol parent, ISymbol child) {
120      throw new NotSupportedException();
121    }
122
123    void ISymbolicExpressionTreeGrammar.RemoveAllowedChildSymbol(ISymbol parent, ISymbol child, int argumentIndex) {
124      throw new NotSupportedException();
125    }
126
127    void ISymbolicExpressionTreeGrammar.SetSubtreeCount(ISymbol symbol, int minimumSubtreeCount, int maximumSubtreeCount) {
128      throw new NotSupportedException();
129    }
130
131    public event EventHandler Changed;
132    #endregion
133  }
134}
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