#region License Information /* HeuristicLab * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL) * * This file is part of HeuristicLab. * * HeuristicLab is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * HeuristicLab is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with HeuristicLab. If not, see . */ #endregion using HeuristicLab.Common; using HeuristicLab.Core; using HeuristicLab.Data; using HeuristicLab.Parameters; using HeuristicLab.Persistence.Default.CompositeSerializers.Storable; namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding { /// /// A base class for operators creating symbolic expression trees. /// [Item("SymbolicExpressionTreeCreator", "A base class for operators creating symbolic expression trees.")] [StorableType("9DF00734-B692-4211-BFD2-57A93F1C47FC")] public abstract class SymbolicExpressionTreeCreator : SymbolicExpressionTreeOperator, ISymbolicExpressionTreeCreator { private const string MaximumSymbolicExpressionTreeLengthParameterName = "MaximumSymbolicExpressionTreeLength"; private const string MaximumSymbolicExpressionTreeDepthParameterName = "MaximumSymbolicExpressionTreeDepth"; private const string SymbolicExpressionTreeGrammarParameterName = "SymbolicExpressionTreeGrammar"; private const string ClonedSymbolicExpressionTreeGrammarParameterName = "ClonedSymbolicExpressionTreeGrammar"; #region Parameter Properties public IValueLookupParameter MaximumSymbolicExpressionTreeLengthParameter { get { return (IValueLookupParameter)Parameters[MaximumSymbolicExpressionTreeLengthParameterName]; } } public IValueLookupParameter MaximumSymbolicExpressionTreeDepthParameter { get { return (IValueLookupParameter)Parameters[MaximumSymbolicExpressionTreeDepthParameterName]; } } public IValueLookupParameter SymbolicExpressionTreeGrammarParameter { get { return (IValueLookupParameter)Parameters[SymbolicExpressionTreeGrammarParameterName]; } } public ILookupParameter ClonedSymbolicExpressionTreeGrammarParameter { get { return (ILookupParameter)Parameters[ClonedSymbolicExpressionTreeGrammarParameterName]; } } #endregion [StorableConstructor] protected SymbolicExpressionTreeCreator(bool deserializing) : base(deserializing) { } protected SymbolicExpressionTreeCreator(SymbolicExpressionTreeCreator original, Cloner cloner) : base(original, cloner) { } protected SymbolicExpressionTreeCreator() : base() { Parameters.Add(new ValueLookupParameter(MaximumSymbolicExpressionTreeLengthParameterName, "The maximal length (number of nodes) of the symbolic expression tree.")); Parameters.Add(new ValueLookupParameter(MaximumSymbolicExpressionTreeDepthParameterName, "The maximal depth of the symbolic expression tree (a tree with one node has depth = 0).")); Parameters.Add(new ValueLookupParameter(SymbolicExpressionTreeGrammarParameterName, "The tree grammar that defines the correct syntax of symbolic expression trees that should be created.")); Parameters.Add(new LookupParameter(ClonedSymbolicExpressionTreeGrammarParameterName, "An immutable clone of the concrete grammar that is actually used to create and manipulate trees.")); } [StorableHook(HookType.AfterDeserialization)] private void AfterDeserialization() { if (!Parameters.ContainsKey(ClonedSymbolicExpressionTreeGrammarParameterName)) Parameters.Add(new LookupParameter(ClonedSymbolicExpressionTreeGrammarParameterName, "An immutable clone of the concrete grammar that is actually used to create and manipulate trees.")); } public override IOperation InstrumentedApply() { if (ClonedSymbolicExpressionTreeGrammarParameter.ActualValue == null) { SymbolicExpressionTreeGrammarParameter.ActualValue.ReadOnly = true; IScope globalScope = ExecutionContext.Scope; while (globalScope.Parent != null) globalScope = globalScope.Parent; globalScope.Variables.Add(new Variable(ClonedSymbolicExpressionTreeGrammarParameterName, (ISymbolicExpressionGrammar)SymbolicExpressionTreeGrammarParameter.ActualValue.Clone())); } SymbolicExpressionTreeParameter.ActualValue = Create(RandomParameter.ActualValue); return base.InstrumentedApply(); } protected abstract ISymbolicExpressionTree Create(IRandom random); public abstract ISymbolicExpressionTree CreateTree(IRandom random, ISymbolicExpressionGrammar grammar, int maxTreeLength, int maxTreeDepth); } }