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/*
* 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.math.genetics;
import java.util.ArrayList;
import java.util.List;
/**
* Chromosome represented by a vector of 0s and 1s.
*
* @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
* @since 2.0
*/
public abstract class BinaryChromosome extends AbstractListChromosome<Integer> {
/**
* Constructor.
* @param representation list of {0,1} values representing the chromosome
*/
public BinaryChromosome(List<Integer> representation) {
super(representation);
}
/**
* Constructor.
* @param representation array of {0,1} values representing the chromosome
*/
public BinaryChromosome(Integer[] representation) {
super(representation);
}
/**
* {@inheritDoc}
*/
@Override
protected void checkValidity(List<Integer> chromosomeRepresentation) throws InvalidRepresentationException {
for (int i : chromosomeRepresentation) {
if (i < 0 || i >1)
throw new InvalidRepresentationException("Elements can be only 0 or 1.");
}
}
/**
* Returns a representation of a random binary array of length <code>length</code>.
* @param length length of the array
* @return a random binary array of length <code>length</code>
*/
public static List<Integer> randomBinaryRepresentation(int length) {
// random binary list
List<Integer> rList= new ArrayList<Integer> (length);
for (int j=0; j<length; j++) {
rList.add(GeneticAlgorithm.getRandomGenerator().nextInt(2));
}
return rList;
}
/**
* {@inheritDoc}
*/
@Override
protected boolean isSame(Chromosome another) {
// type check
if (! (another instanceof BinaryChromosome))
return false;
BinaryChromosome anotherBc = (BinaryChromosome) another;
// size check
if (getLength() != anotherBc.getLength())
return false;
for (int i=0; i< getRepresentation().size(); i++) {
if (!(getRepresentation().get(i).equals(anotherBc.getRepresentation().get(i))))
return false;
}
// all is ok
return true;
}
}
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