#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 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 HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Operators;
using HeuristicLab.Random;
using HeuristicLab.Data;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Parameters;
using System.Collections.Generic;
using System;
namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Symbols {
  [StorableClass]
  [Item("Variable", "Represents a variable value.")]
  public sealed class Variable : Symbol {
    #region Properties
    private double weightNu;
    [Storable]
    public double WeightNu {
      get { return weightNu; }
      set { weightNu = value; }
    }
    private double weightSigma;
    [Storable]
    public double WeightSigma {
      get { return weightSigma; }
      set {
        if (weightSigma < 0.0) throw new ArgumentException("Negative sigma is not allowed.");
        weightSigma = value;
      }
    }
    private List<string> variableNames;
    [Storable]
    public ICollection<string> VariableNames {
      get { return variableNames; }
      set {
        if (value == null) throw new ArgumentNullException();
        variableNames.Clear();
        variableNames.AddRange(value);
      }
    }
    #endregion
    public Variable()
      : base() {
      weightNu = 1.0;
      weightSigma = 1.0;
      variableNames = new List<string>();
    }

    public override SymbolicExpressionTreeNode CreateTreeNode() {
      return new VariableTreeNode(this);
    }
  }
}