source: trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/Symbol.cs @ 3368

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 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 <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using HeuristicLab.Core;
using System.Linq;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Data;
using HeuristicLab.Parameters;

namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
  [StorableClass]
  [Item("Symbol", "Represents a symbol in a symbolic function tree.")]
  public abstract class Symbol : NamedItem {
    #region Properties
    private double initialFrequency;
    public double InitialFrequency {
      get { return initialFrequency; }
      set {
        if (value < 0.0) throw new ArgumentException("InitialFrequency must be positive");
        initialFrequency = value;
      }
    }
    #endregion

    protected Symbol()
      : base() {
      this.name = ItemName;
      this.description = ItemDescription;
      initialFrequency = 1.0;
    }

    public virtual SymbolicExpressionTreeNode CreateTreeNode() {
      return new SymbolicExpressionTreeNode(this);
    }
  }
}