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Java example source code file (BinaryMutation.java)

This example Java source code file (BinaryMutation.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

binarychromosome, binarymutation, chromosome, list, mathillegalargumentexception, mutationpolicy, util

The BinaryMutation.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.commons.math3.genetics;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.exception.util.LocalizedFormats;

/**
 * Mutation for {@link BinaryChromosome}s. Randomly changes one gene.
 *
 * @since 2.0
 */
public class BinaryMutation implements MutationPolicy {

    /**
     * Mutate the given chromosome. Randomly changes one gene.
     *
     * @param original the original chromosome.
     * @return the mutated chromosome.
     * @throws MathIllegalArgumentException if <code>original is not an instance of {@link BinaryChromosome}.
     */
    public Chromosome mutate(Chromosome original) throws MathIllegalArgumentException {
        if (!(original instanceof BinaryChromosome)) {
            throw new MathIllegalArgumentException(LocalizedFormats.INVALID_BINARY_CHROMOSOME);
        }

        BinaryChromosome origChrom = (BinaryChromosome) original;
        List<Integer> newRepr = new ArrayList(origChrom.getRepresentation());

        // randomly select a gene
        int geneIndex = GeneticAlgorithm.getRandomGenerator().nextInt(origChrom.getLength());
        // and change it
        newRepr.set(geneIndex, origChrom.getRepresentation().get(geneIndex) == 0 ? 1 : 0);

        Chromosome newChrom = origChrom.newFixedLengthChromosome(newRepr);
        return newChrom;
    }

}

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