#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 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.Common;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
  [Item("Fragment", "Class that represents a tree fragment")]
  [StorableClass]
  public class Fragment : Item, IFragment {
    public ISymbolicExpressionTreeNode Root { get; set; }
    private int length = -1;
    public int Length {
      get {
        if (Root == null) return 0;
        if (length == -1) length = Root.GetLength();
        return length;
      }
      set { length = value; }
    }

    [StorableConstructor]
    private Fragment(bool serializing) : base(serializing) { }
    private Fragment(Fragment original, Cloner cloner)
      : base(original, cloner) {
      // avoid deep copy of the symbolic expression tree node
      Root = original.Root;
      length = original.Length;
    }

    public Fragment(ISymbolicExpressionTreeNode node) {
      Root = node;
      length = (node == null) ? 0 : node.GetLength();
    }

    public Fragment(ISymbolicExpressionTreeNode node, int length) {
      Root = node;
      this.length = length;
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new Fragment(this, cloner);
    }
  }
}