source: branches/2520_PersistenceReintegration/HeuristicLab.Operators/3.3/Placeholder.cs @ 16453

Last change on this file since 16453 was 16453, checked in by jkarder, 2 years ago

#2520: updated year of copyrights

File size: 2.4 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Parameters;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Operators {
28  /// <summary>
29  /// An operator which acts as a placeholder for another operator retrieved from the scope or a parent execution context.
30  /// </summary>
31  [Item("Placeholder", "An operator which acts as a placeholder for another operator retrieved from the scope or a parent execution context.")]
32  [StorableClass]
33  public sealed class Placeholder : SingleSuccessorOperator {
34    public LookupParameter<IOperator> OperatorParameter {
35      get { return (LookupParameter<IOperator>)Parameters["Operator"]; }
36    }
37
38    [StorableConstructor]
39    private Placeholder(bool deserializing) : base(deserializing) { }
40    private Placeholder(Placeholder original, Cloner cloner)
41      : base(original, cloner) {
42    }
43    public Placeholder()
44      : base() {
45      Parameters.Add(new LookupParameter<IOperator>("Operator", "The operator which is retrieved from the scope or a parent execution context and applied on the current scope."));
46    }
47
48    public override IDeepCloneable Clone(Cloner cloner) {
49      return new Placeholder(this, cloner);
50    }
51
52    public override IOperation Apply() {
53      OperationCollection next = new OperationCollection(base.Apply());
54      IOperator op = OperatorParameter.ActualValue;
55      if (op != null)
56        next.Insert(0, ExecutionContext.CreateOperation(op));
57      return next;
58    }
59  }
60}
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