1 package net.bmahe.genetics4j.moo.nsga2.impl;
2
3 import java.util.Objects;
4 import java.util.random.RandomGenerator;
5
6 import org.apache.commons.lang3.Validate;
7
8 import net.bmahe.genetics4j.core.selection.SelectionPolicyHandler;
9 import net.bmahe.genetics4j.core.selection.SelectionPolicyHandlerResolver;
10 import net.bmahe.genetics4j.core.selection.Selector;
11 import net.bmahe.genetics4j.core.spec.AbstractEAConfiguration;
12 import net.bmahe.genetics4j.core.spec.AbstractEAExecutionContext;
13 import net.bmahe.genetics4j.core.spec.selection.SelectionPolicy;
14 import net.bmahe.genetics4j.moo.nsga2.spec.TournamentNSGA2Selection;
15
16 public class TournamentNSGA2SelectionPolicyHandler<T extends Comparable<T>> implements SelectionPolicyHandler<T> {
17
18 private final RandomGenerator randomGenerator;
19
20 public TournamentNSGA2SelectionPolicyHandler(final RandomGenerator _randomGenerator) {
21 Objects.requireNonNull(_randomGenerator);
22
23 this.randomGenerator = _randomGenerator;
24 }
25
26 @Override
27 public boolean canHandle(final SelectionPolicy selectionPolicy) {
28 Objects.requireNonNull(selectionPolicy);
29 return selectionPolicy instanceof TournamentNSGA2Selection<?>;
30 }
31
32 @Override
33 public Selector<T> resolve(final AbstractEAExecutionContext<T> EASystemDescriptor,
34 final AbstractEAConfiguration<T> eaConfiguration,
35 final SelectionPolicyHandlerResolver<T> selectionPolicyHandlerResolver,
36 final SelectionPolicy selectionPolicy) {
37 Objects.requireNonNull(EASystemDescriptor);
38 Objects.requireNonNull(eaConfiguration);
39 Objects.requireNonNull(selectionPolicyHandlerResolver);
40 Objects.requireNonNull(selectionPolicy);
41 Validate.isInstanceOf(TournamentNSGA2Selection.class, selectionPolicy);
42
43 final TournamentNSGA2Selection<T> tournamentNsga2Spec = (TournamentNSGA2Selection<T>) selectionPolicy;
44
45 return new TournamentNSGA2Selector<>(randomGenerator, tournamentNsga2Spec);
46 }
47 }