#region License Information
/* HeuristicLab
* Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
*
* This file is part of HeuristicLab.
*
* HeuristicLab is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* HeuristicLab is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with HeuristicLab. If not, see .
*/
#endregion
using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
namespace HeuristicLab.Selection {
///
/// A random selection operator.
///
[Item("RandomSelector", "A random selection operator.")]
[StorableClass]
public sealed class RandomSelector : StochasticSelector, ISelector {
private IValueParameter CopySelectedParameter {
get { return (IValueParameter)Parameters["CopySelected"]; }
}
public IValueLookupParameter NumberOfSelectedSubScopesParameter {
get { return (ValueLookupParameter)Parameters["NumberOfSelectedSubScopes"]; }
}
public BoolValue CopySelected {
get { return CopySelectedParameter.Value; }
set { CopySelectedParameter.Value = value; }
}
[StorableConstructor]
private RandomSelector(bool deserializing) : base(deserializing) { }
private RandomSelector(RandomSelector original, Cloner cloner)
: base(original, cloner) {
}
public override IDeepCloneable Clone(Cloner cloner) {
return new RandomSelector(this, cloner);
}
public RandomSelector()
: base() {
Parameters.Add(new ValueParameter("CopySelected", "True if the selected sub-scopes should be copied, otherwise false.", new BoolValue(true)));
Parameters.Add(new ValueLookupParameter("NumberOfSelectedSubScopes", "The number of sub-scopes which should be selected."));
CopySelectedParameter.Hidden = true;
}
protected override IScope[] Select(List scopes) {
int count = NumberOfSelectedSubScopesParameter.ActualValue.Value;
bool copy = CopySelectedParameter.Value.Value;
IRandom random = RandomParameter.ActualValue;
IScope[] selected = new IScope[count];
for (int i = 0; i < count; i++) {
if (copy)
selected[i] = (IScope)scopes[random.Next(scopes.Count)].Clone();
else {
int index = random.Next(scopes.Count);
selected[i] = scopes[index];
scopes.RemoveAt(index);
}
}
return selected;
}
}
}