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source: branches/3.0/sources/HeuristicLab.Functions/Constant.cs @ 14581

Last change on this file since 14581 was 2, checked in by swagner, 17 years ago

Added HeuristicLab 3.0 sources from former SVN repository at revision 52

File size: 2.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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 System.Collections.Generic;
24using System.Text;
25using HeuristicLab.Data;
26using HeuristicLab.Core;
27using System.Xml;
28using HeuristicLab.Constraints;
29using HeuristicLab.DataAnalysis;
30
31namespace HeuristicLab.Functions {
32  public class Constant : FunctionBase {
33
34    private IVariable value;
35
36    public override string Description {
37      get { return "Returns the value of local variable 'Value'."; }
38    }
39
40    public ConstrainedDoubleData Value {
41      get {
42        return (ConstrainedDoubleData)value.Value;
43      }
44    }
45
46    public Constant()
47      : base() {
48      AddVariableInfo(new VariableInfo("Value", "The constant value", typeof(ConstrainedDoubleData), VariableKind.None));
49      GetVariableInfo("Value").Local = true;
50
51      ConstrainedDoubleData valueData = new ConstrainedDoubleData();
52      // initialize a default range for the contant value
53      valueData.AddConstraint(new DoubleBoundedConstraint(-20.0, 20.0));
54
55      // create the local variable
56      value = new HeuristicLab.Core.Variable("Value", valueData);
57      AddLocalVariable(value);
58
59      // constant can't have suboperators
60      AddConstraint(new NumberOfSubOperatorsConstraint(0, 0));
61    }
62
63    public Constant(Constant source, IDictionary<Guid, object> clonedObjects)
64      : base(source, clonedObjects) {
65      value = GetVariable("Value");
66    }
67
68    public override object Clone(IDictionary<Guid, object> clonedObjects) {
69      Constant clone = new Constant(this, clonedObjects);
70      clonedObjects.Add(clone.Guid, clone);
71      return clone;
72    }
73
74
75    public override void Populate(XmlNode node, IDictionary<Guid,IStorable> restoredObjects) {
76      base.Populate(node, restoredObjects);
77
78      value = GetVariable("Value");
79    }
80
81    public override double Evaluate(Dataset dataset, int sampleIndex) {
82      return ((ConstrainedDoubleData)value.Value).Data;
83    }
84
85    public override void Accept(IFunctionVisitor visitor) {
86      visitor.Visit(this);
87    }
88  }
89}
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