1 package net.bmahe.genetics4j.core.replacement;
2
3 import java.util.List;
4
5 import org.apache.commons.lang3.Validate;
6
7 import net.bmahe.genetics4j.core.Genotype;
8 import net.bmahe.genetics4j.core.Population;
9 import net.bmahe.genetics4j.core.selection.Selector;
10 import net.bmahe.genetics4j.core.spec.AbstractEAConfiguration;
11 import net.bmahe.genetics4j.core.spec.replacement.GenerationalReplacement;
12
13 public class GenerationalReplacementImpl<T extends Comparable<T>> implements ReplacementStrategyImplementor<T> {
14
15 private final GenerationalReplacement generationalReplacementSpec;
16 private final Selector<T> offspringSelector;
17
18 public GenerationalReplacementImpl(final GenerationalReplacement _elistismSpec,
19 final Selector<T> _offspringSelector) {
20 Validate.notNull(_elistismSpec);
21
22 this.generationalReplacementSpec = _elistismSpec;
23 this.offspringSelector = _offspringSelector;
24 }
25
26 @Override
27 public Population<T> select(final AbstractEAConfiguration<T> eaConfiguration, final int numIndividuals,
28 final List<Genotype> population, final List<T> populationScores, final List<Genotype> offsprings,
29 final List<T> offspringScores) {
30 Validate.notNull(eaConfiguration);
31 Validate.isTrue(numIndividuals > 0);
32 Validate.notNull(population);
33 Validate.notNull(populationScores);
34 Validate.isTrue(population.size() == populationScores.size());
35 Validate.notNull(offsprings);
36 Validate.notNull(offspringScores);
37 Validate.isTrue(offsprings.size() == offspringScores.size());
38
39 final Population<T> selected = new Population<>();
40
41 final Population<T> selectedOffspring = offspringSelector
42 .select(eaConfiguration, numIndividuals, offsprings, offspringScores);
43 selected.addAll(selectedOffspring);
44
45 return selected;
46 }
47 }