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The Apache Commons Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.
/*
* 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 type of the representation list
* @since 2.0
*/
public abstract class AbstractListChromosome extends Chromosome {
/** List representing the chromosome */
private final List representation;
/**
* Constructor, copying the input representation.
* @param representation inner representation of the chromosome
* @throws InvalidRepresentationException iff the representation can not represent a valid chromosome
*/
public AbstractListChromosome(final List representation) throws InvalidRepresentationException {
this(representation, true);
}
/**
* Constructor, copying the input representation.
* @param representation inner representation of the chromosome
* @throws InvalidRepresentationException iff the 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 representation, final boolean copyList) {
checkValidity(representation);
this.representation =
Collections.unmodifiableList(copyList ? new ArrayList(representation) : representation);
}
/**
* Asserts that representation can represent a valid chromosome.
*
* @param chromosomeRepresentation representation of the chromosome
* @throws InvalidRepresentationException iff the representation can not represent a valid chromosome
*/
protected abstract void checkValidity(List chromosomeRepresentation) throws InvalidRepresentationException;
/**
* Returns the (immutable) inner representation of the chromosome.
* @return the representation of the chromosome
*/
protected List 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 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.
*
* 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 newFixedLengthChromosome(final List chromosomeRepresentation);
/** {@inheritDoc} */
@Override
public String toString() {
return String.format("(f=%s %s)", getFitness(), getRepresentation());
}
}