IntChromosomeSinglePointArithmetic.java
- package net.bmahe.genetics4j.core.combination.singlepointarithmetic;
- import java.util.List;
- import java.util.random.RandomGenerator;
- import org.apache.commons.lang3.Validate;
- import net.bmahe.genetics4j.core.chromosomes.Chromosome;
- import net.bmahe.genetics4j.core.chromosomes.IntChromosome;
- import net.bmahe.genetics4j.core.combination.ChromosomeCombinator;
- import net.bmahe.genetics4j.core.spec.AbstractEAConfiguration;
- public class IntChromosomeSinglePointArithmetic<T extends Comparable<T>> implements ChromosomeCombinator<T> {
- private final RandomGenerator randomGenerator;
- private final double alpha;
- public IntChromosomeSinglePointArithmetic(final RandomGenerator _randomGenerator, final double _alpha) {
- Validate.notNull(_randomGenerator);
- Validate.inclusiveBetween(0.0d, 1.0d, _alpha);
- this.randomGenerator = _randomGenerator;
- this.alpha = _alpha;
- }
- @Override
- public List<Chromosome> combine(final AbstractEAConfiguration<T> eaConfiguration, final Chromosome chromosome1,
- final T firstParentFitness, final Chromosome chromosome2, final T secondParentFitness) {
- Validate.notNull(chromosome1);
- Validate.notNull(chromosome2);
- Validate.isInstanceOf(IntChromosome.class, chromosome1);
- Validate.isInstanceOf(IntChromosome.class, chromosome2);
- Validate.isTrue(chromosome1.getNumAlleles() == chromosome2.getNumAlleles());
- final int alleleSplit = randomGenerator.nextInt(chromosome1.getNumAlleles());
- final IntChromosome intChromosome1 = (IntChromosome) chromosome1;
- final IntChromosome intChromosome2 = (IntChromosome) chromosome2;
- final int numAlleles = chromosome1.getNumAlleles();
- final int[] firstChildValues = new int[numAlleles];
- final int[] secondChildValues = new int[numAlleles];
- for (int i = 0; i < numAlleles; i++) {
- final int firstAllele = intChromosome1.getAllele(i);
- final int secondAllele = intChromosome2.getAllele(i);
- if (i < alleleSplit) {
- firstChildValues[i] = (int) (alpha * firstAllele + (1 - alpha) * secondAllele);
- secondChildValues[i] = (int) ((1 - alpha) * firstAllele + alpha * secondAllele);
- } else {
- firstChildValues[i] = (int) ((1 - alpha) * firstAllele + alpha * secondAllele);
- secondChildValues[i] = (int) (alpha * firstAllele + (1 - alpha) * secondAllele);
- }
- }
- return List.of(
- new IntChromosome(numAlleles, intChromosome1.getMinValue(), intChromosome1.getMaxValue(), firstChildValues),
- new IntChromosome(numAlleles,
- intChromosome1.getMinValue(),
- intChromosome1.getMaxValue(),
- secondChildValues));
- }
- }