#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Joseph Helm and 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.PackingEncoding.GroupingVector {
  [Item("Grouping Vector Swap2 Manipulator", "An operator which manipulates a PackingSequence representation.")]
  [StorableClass]
  public class GroupingVectorSwap2Manipulator :  GroupingVectorManipulator {
    [StorableConstructor]
    protected GroupingVectorSwap2Manipulator (bool deserializing) : base(deserializing) { }
    protected GroupingVectorSwap2Manipulator(GroupingVectorSwap2Manipulator original, Cloner cloner) : base(original, cloner) { }
    public GroupingVectorSwap2Manipulator()
      : base() {
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new GroupingVectorSwap2Manipulator(this, cloner);
    }

    protected override void Manipulate(IRandom random, GroupingVectorEncoding individual) {

      int index1 = 0;
      int index2 = 1;

      if (individual.GroupingVector.Length <= 1)
        return;
      else if (individual.GroupingVector.Length != 2) {
        index1 = random.Next(individual.GroupingVector.Length);
        index2 = random.Next(individual.GroupingVector.Length);
        while (index2.Equals(index1)) {
          index2 = random.Next(individual.GroupingVector.Length);
        }
      }

      int temp = individual.GroupingVector [index1];
      individual.GroupingVector[index1] = individual.GroupingVector[index2];
      individual.GroupingVector[index2] = temp;
    }

  }
}