/** {@inheritDoc} */
public Node mutate(Random rng, Probability mutationProbability, TreeFactory treeFactory) {
if (mutationProbability.nextEvent(rng)) {
return treeFactory.generateRandomCandidate(rng);
} else {
Node newLeft = left.mutate(rng, mutationProbability, treeFactory);
Node newRight = right.mutate(rng, mutationProbability, treeFactory);
if (newLeft != left && newRight != right) {
return newInstance(newLeft, newRight);
} else {
// Tree has not changed.
return this;
}
}
}
@Override
public List<List<DomBuyRule>> apply(List<List<DomBuyRule>> selectedCandidates, Random rng) {
List<List<DomBuyRule>> mutants = new ArrayList<List<DomBuyRule>>();
for (List<DomBuyRule> candidate : selectedCandidates) {
BuyStrategy mutant = new BuyStrategy(candidate);
mutants.add(mutant);
}
mutants
.parallelStream()
.forEach(
x -> {
if (probability.nextEvent(rng)) {
mutate(x, rng);
}
});
return mutants;
}
