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Java example source code file (AbstractListChromosome.java)

This example Java source code file (AbstractListChromosome.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

abstractlistchromosome, arraylist, invalidrepresentationexception, list, override, string, util

The AbstractListChromosome.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.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * Chromosome represented by an immutable list of a fixed length.
 *
 * @param <T> type of the representation list
 * @since 2.0
 */
public abstract class AbstractListChromosome<T> extends Chromosome {

    /** List representing the chromosome */
    private final List<T> representation;

    /**
     * Constructor, copying the input representation.
     * @param representation inner representation of the chromosome
     * @throws InvalidRepresentationException iff the <code>representation can not represent a valid chromosome
     */
    public AbstractListChromosome(final List<T> representation) throws InvalidRepresentationException {
        this(representation, true);
    }

    /**
     * Constructor, copying the input representation.
     * @param representation inner representation of the chromosome
     * @throws InvalidRepresentationException iff the <code>representation can not represent a valid chromosome
     */
    public AbstractListChromosome(final T[] representation) throws InvalidRepresentationException {
        this(Arrays.asList(representation));
    }

    /**
     * Constructor.
     * @param representation inner representation of the chromosome
     * @param copyList if {@code true}, the representation will be copied, otherwise it will be referenced.
     * @since 3.3
     */
    public AbstractListChromosome(final List<T> representation, final boolean copyList) {
        checkValidity(representation);
        this.representation =
                Collections.unmodifiableList(copyList ? new ArrayList<T>(representation) : representation);
    }

    /**
     * Asserts that <code>representation can represent a valid chromosome.
     *
     * @param chromosomeRepresentation representation of the chromosome
     * @throws InvalidRepresentationException iff the <code>representation can not represent a valid chromosome
     */
    protected abstract void checkValidity(List<T> chromosomeRepresentation) throws InvalidRepresentationException;

    /**
     * Returns the (immutable) inner representation of the chromosome.
     * @return the representation of the chromosome
     */
    protected List<T> getRepresentation() {
        return representation;
    }

    /**
     * Returns the length of the chromosome.
     * @return the length of the chromosome
     */
    public int getLength() {
        return getRepresentation().size();
    }

    /**
     * Creates a new instance of the same class as <code>this is, with a given arrayRepresentation.
     * This is needed in crossover and mutation operators, where we need a new instance of the same class, but with
     * different array representation.
     * <p>
     * Usually, this method just calls a constructor of the class.
     *
     * @param chromosomeRepresentation the inner array representation of the new chromosome.
     * @return new instance extended from FixedLengthChromosome with the given arrayRepresentation
     */
    public abstract AbstractListChromosome<T> newFixedLengthChromosome(final List chromosomeRepresentation);

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return String.format("(f=%s %s)", getFitness(), getRepresentation());
    }
}

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