source: trunk/sources/HeuristicLab.Operators/3.3/Comparator.cs @ 15583

Last change on this file since 15583 was 15583, checked in by swagner, 3 years ago

#2640: Updated year of copyrights in license headers

File size: 3.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 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;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Data;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Operators {
30  /// <summary>
31  /// An operator which compares two items.
32  /// </summary>
33  [Item("Comparator", "An operator which compares two items.")]
34  [StorableClass]
35  public sealed class Comparator : SingleSuccessorOperator {
36    public LookupParameter<IItem> LeftSideParameter {
37      get { return (LookupParameter<IItem>)Parameters["LeftSide"]; }
38    }
39    public ValueLookupParameter<IItem> RightSideParameter {
40      get { return (ValueLookupParameter<IItem>)Parameters["RightSide"]; }
41    }
42    private ValueParameter<Comparison> ComparisonParameter {
43      get { return (ValueParameter<Comparison>)Parameters["Comparison"]; }
44    }
45    public LookupParameter<BoolValue> ResultParameter {
46      get { return (LookupParameter<BoolValue>)Parameters["Result"]; }
47    }
48    public Comparison Comparison {
49      get { return ComparisonParameter.Value; }
50      set { ComparisonParameter.Value = value; }
51    }
52
53    [StorableConstructor]
54    private Comparator(bool deserializing) : base(deserializing) { }
55    private Comparator(Comparator original, Cloner cloner)
56      : base(original, cloner) {
57    }
58    public Comparator()
59      : base() {
60      Parameters.Add(new LookupParameter<IItem>("LeftSide", "The left side of the comparison."));
61      Parameters.Add(new ValueLookupParameter<IItem>("RightSide", "The right side of the comparison."));
62      Parameters.Add(new ValueParameter<Comparison>("Comparison", "The type of comparison.", new Comparison(Data.ComparisonType.Equal)));
63      Parameters.Add(new LookupParameter<BoolValue>("Result", "The result of the comparison."));
64    }
65
66    public override IDeepCloneable Clone(Cloner cloner) {
67      return new Comparator(this, cloner);
68    }
69
70    public override IOperation Apply() {
71      IItem left = LeftSideParameter.ActualValue;
72      IItem right = RightSideParameter.ActualValue;
73      IComparable comparable = left as IComparable;
74      if (comparable == null) throw new InvalidOperationException();
75
76      int i = comparable.CompareTo(right);
77      bool b = false;
78      switch (Comparison.Value) {
79        case HeuristicLab.Data.ComparisonType.Less:
80          b = i < 0; break;
81        case HeuristicLab.Data.ComparisonType.LessOrEqual:
82          b = i <= 0; break;
83        case HeuristicLab.Data.ComparisonType.Equal:
84          b = i == 0; break;
85        case HeuristicLab.Data.ComparisonType.GreaterOrEqual:
86          b = i >= 0; break;
87        case HeuristicLab.Data.ComparisonType.Greater:
88          b = i > 0; break;
89        case HeuristicLab.Data.ComparisonType.NotEqual:
90          b = i != 0; break;
91      }
92      ResultParameter.ActualValue = new BoolValue(b);
93      return base.Apply();
94    }
95  }
96}
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