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RepairingAlterer.java
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RepairingAlterer.java
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/*
* Java Genetic Algorithm Library (@__identifier__@).
* Copyright (c) @__year__@ Franz Wilhelmstötter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Author:
* Franz Wilhelmstötter (franz.wilhelmstoetter@gmail.com)
*/
package io.jenetics.engine;
import static java.util.Objects.requireNonNull;
import java.util.function.Function;
import io.jenetics.Alterer;
import io.jenetics.AltererResult;
import io.jenetics.Gene;
import io.jenetics.Genotype;
import io.jenetics.Phenotype;
import io.jenetics.util.MSeq;
import io.jenetics.util.Seq;
/**
* @author <a href="mailto:franz.wilhelmstoetter@gmail.com">Franz Wilhelmstötter</a>
*/
public final class RepairingAlterer<
G extends Gene<?, G>,
C extends Comparable<? super C>
>
implements Alterer<G, C>
{
private final Alterer<G, C> _adoptee;
private final Function<Genotype<G>, Genotype<G>> _repair;
public RepairingAlterer(
final Alterer<G, C> adoptee,
final Function<Genotype<G>, Genotype<G>> repair
) {
_adoptee = requireNonNull(adoptee);
_repair = requireNonNull(repair);
}
@Override
public AltererResult<G, C> alter(
final Seq<Phenotype<G, C>> population,
final long generation
) {
final AltererResult<G, C> result = _adoptee.alter(population, generation);
final MSeq<Phenotype<G, C>> pop = MSeq.of(population);
for (int i = 0, n = pop.size(); i < n; ++i) {
if (!pop.get(i).isValid()) {
pop.set(i, repair(pop.get(i)));
}
}
return new AltererResult<>(pop.toISeq(), result.alterations());
}
private Phenotype<G, C> repair(final Phenotype<G, C> pt) {
return Phenotype.of(
_repair.apply(pt.genotype()),
pt.generation()
);
}
}