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source: trunk/sources/HeuristicLab.Operators/3.3/Comparator.cs @ 3188

Last change on this file since 3188 was 3160, checked in by swagner, 15 years ago

Removed Creatable test attribute (#935).

File size: 3.4 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;
23using HeuristicLab.Core;
24using HeuristicLab.Data;
25using HeuristicLab.Parameters;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.Operators {
29  /// <summary>
30  /// An operator which compares two items.
31  /// </summary>
32  [Item("Comparator", "An operator which compares two items.")]
33  [StorableClass]
34  public sealed class Comparator : SingleSuccessorOperator {
35    public LookupParameter<IItem> LeftSideParameter {
36      get { return (LookupParameter<IItem>)Parameters["LeftSide"]; }
37    }
38    public ValueLookupParameter<IItem> RightSideParameter {
39      get { return (ValueLookupParameter<IItem>)Parameters["RightSide"]; }
40    }
41    private ValueParameter<Comparison> ComparisonParameter {
42      get { return (ValueParameter<Comparison>)Parameters["Comparison"]; }
43    }
44    public LookupParameter<BoolValue> ResultParameter {
45      get { return (LookupParameter<BoolValue>)Parameters["Result"]; }
46    }
47    public Comparison Comparison {
48      get { return ComparisonParameter.Value; }
49      set { ComparisonParameter.Value = value; }
50    }
51
52    public Comparator()
53      : base() {
54      Parameters.Add(new LookupParameter<IItem>("LeftSide", "The left side of the comparison."));
55      Parameters.Add(new ValueLookupParameter<IItem>("RightSide", "The right side of the comparison."));
56      Parameters.Add(new ValueParameter<Comparison>("Comparison", "The type of comparison.", new Comparison(Data.ComparisonType.Equal)));
57      Parameters.Add(new LookupParameter<BoolValue>("Result", "The result of the comparison."));
58    }
59
60    public override IOperation Apply() {
61      IItem left = LeftSideParameter.ActualValue;
62      IItem right = RightSideParameter.ActualValue;
63      IComparable comparable = left as IComparable;
64      if (comparable == null) throw new InvalidOperationException();
65
66      int i = comparable.CompareTo(right);
67      bool b = false;
68      switch (Comparison.Value) {
69        case HeuristicLab.Data.ComparisonType.Less:
70          b = i < 0; break;
71        case HeuristicLab.Data.ComparisonType.LessOrEqual:
72          b = i <= 0; break;
73        case HeuristicLab.Data.ComparisonType.Equal:
74          b = i == 0; break;
75        case HeuristicLab.Data.ComparisonType.GreaterOrEqual:
76          b = i >= 0; break;
77        case HeuristicLab.Data.ComparisonType.Greater:
78          b = i > 0; break;
79        case HeuristicLab.Data.ComparisonType.NotEqual:
80          b = i != 0; break;
81      }
82      ResultParameter.ActualValue = new BoolValue(b);
83      return base.Apply();
84    }
85  }
86}
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