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source: trunk/sources/HeuristicLab.Selection/3.3/BestSelector.cs @ 3376

Last change on this file since 3376 was 3376, checked in by swagner, 14 years ago

Moved interfaces and classes for deep cloning from HeuristicLab.Core to HeuristicLab.Common (#975).

File size: 2.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System.Collections.Generic;
23using System.Linq;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Optimization;
28using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
29
30namespace HeuristicLab.Selection {
31  /// <summary>
32  /// A selection operator which considers a single double quality value and selects the best.
33  /// </summary>
34  [Item("BestSelector", "A selection operator which considers a single double quality value and selects the best.")]
35  [StorableClass]
36  public sealed class BestSelector : SingleObjectiveSelector, ISingleObjectiveSelector {
37    public BestSelector() : base() { }
38
39    protected override IScope[] Select(List<IScope> scopes) {
40      int count = NumberOfSelectedSubScopesParameter.ActualValue.Value;
41      bool copy = CopySelectedParameter.Value.Value;
42      bool maximization = MaximizationParameter.ActualValue.Value;
43      ItemArray<DoubleValue> qualities = QualityParameter.ActualValue;
44      IScope[] selected = new IScope[count];
45
46      // create a list for each scope that contains the scope's index in the original scope list
47      var temp = qualities.Select((x, index) => new { index, x.Value });
48      if (maximization)
49        temp = temp.OrderByDescending(x => x.Value);
50      else
51        temp = temp.OrderBy(x => x.Value);
52      var list = temp.ToList();
53
54      if (copy) {
55        int j = 0;
56        for (int i = 0; i < count; i++) {
57          selected[i] = (IScope)scopes[list[j].index].Clone();
58          j++;
59          if (j >= list.Count) j = 0;
60        }
61      } else {
62        for (int i = 0; i < count; i++) {
63          selected[i] = scopes[list[0].index];
64          scopes[list[0].index] = null;
65          list.RemoveAt(0);
66        }
67        scopes.RemoveAll(x => x == null);
68      }
69      return selected;
70    }
71  }
72}
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