@Override
public Chromosome apply(Chromosome... chromosomes) {
final Chromosome mutated = new Chromosome(chromosomes[0]);
if (mutated.size() > 0) {
double toleranceRatio = getWidthToleranceRatio(mutated);
// delete roll from one of the existing groups,
// formulate residual demands (without group that was updated)
// and generate new pattern for updated group
List<GeneGroup> groups = groupGenes(mutated);
int groupIndex = rGen.nextInt(groups.size());
GeneGroup selectedGroup = groups.get(groupIndex);
// remove group's genes from chromosome
for (int i = selectedGroup.size() - 1; i >= 0; i--) {
int indexToRemove = selectedGroup.getGeneIndex(i);
mutated.removeGene(indexToRemove);
}
int geneIndexInGroup = rGen.nextInt(selectedGroup.size());
selectedGroup.removeGene(geneIndexInGroup, true);
if (selectedGroup.size() > 0) {
// formulate residual demands
int[] demand = calcDemand(selectedGroup.getTotalLength(), mutated);
// generate new pattern
int[] pattern = generator.generate(selectedGroup.getMinRollWidth(), demand, toleranceRatio);
if (pattern != null) {
// insert group's genes with new pattern
for (int i = 0; i < selectedGroup.size(); i++) {
Gene previous = selectedGroup.getGene(i);
Gene replacement = new Gene(pattern.clone(), previous.getRoll());
int indexToAdd = selectedGroup.getGeneIndex(i);
mutated.addGene(indexToAdd, replacement);
}
}
}
}
return mutated;
}
