source: trunk/sources/HeuristicLab.Core/3.3/Constraints/ComparisonConstraint.cs @ 3613

Last change on this file since 3613 was 3613, checked in by mkommend, 12 years ago

updated Constraints (ticket #996)

File size: 3.7 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;
23using System.Collections.Generic;
24using System.Linq;
25using System.Text;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.Core {
29  [StorableClass]
30  [Item("ComparisonConstraint", "A constraint which checks for specified compare operation.")]
31  public class ComparisonConstraint : Constraint {
32    public ComparisonConstraint()
33      : base() {
34    }
35    [StorableConstructor]
36    protected ComparisonConstraint(bool deserializing) {
37    }
38    public ComparisonConstraint(IItem constrainedValue, ConstraintOperation comparisonOperation, object comparisonValue)
39      : base(constrainedValue, comparisonOperation, comparisonValue) {
40    }
41    public ComparisonConstraint(IItem constrainedValue, ConstraintOperation comparisonOperation, object comparisonValue, bool active)
42      : base(constrainedValue, comparisonOperation, comparisonOperation, active) {
43    }
44
45    public override IEnumerable<ConstraintOperation> AllowedConstraintOperations {
46      get { return new ConstraintOperation[6] { ConstraintOperation.Lesser, ConstraintOperation.LesserOrEqual, ConstraintOperation.Equal, ConstraintOperation.GreaterOrEqual, ConstraintOperation.Greater, ConstraintOperation.NotEqual }; }
47    }
48
49    protected override bool Check(object constrainedMember) {
50      if (constrainedMember == null)
51        return false;
52
53      IComparable comparableMember = constrainedMember as IComparable;
54      if (comparableMember == null)
55        throw new InvalidOperationException("Constrained member must be of type IComparable to be used with ComparisonConstraint.");
56
57      int compareResult = comparableMember.CompareTo(this.ConstraintData);
58      bool result = false;
59      if (this.ConstraintOperation == ConstraintOperation.Lesser)
60        result = compareResult < 0;
61      else if (this.ConstraintOperation == ConstraintOperation.LesserOrEqual)
62        result = compareResult <= 0;
63      else if (this.ConstraintOperation == ConstraintOperation.Equal)
64        result = compareResult == 0;
65      else if (this.ConstraintOperation == ConstraintOperation.GreaterOrEqual)
66        result = compareResult >= 0;
67      else if (this.ConstraintOperation == ConstraintOperation.Greater)
68        result = compareResult > 0;
69      else if (this.ConstraintOperation == ConstraintOperation.NotEqual)
70        result = compareResult != 0;
71      else
72        throw new InvalidOperationException("Constraint operation " + this.ConstraintOperation + " is not defined for ComparisonConstraint.");
73
74      return result;
75    }
76
77    protected override bool Check(object constrainedMember, out string errorMessage) {
78      bool result = Check(constrainedMember);
79      errorMessage = string.Empty;
80      if (!result)
81        errorMessage = constrainedMember.ToString() + " must be " + ConstraintOperation.ToString() + " than " + ConstraintData.ToString() + ".";
82      return result;
83    }
84  }
85}
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