001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.math3.genetics;
018    
019    import org.apache.commons.math3.exception.MathIllegalArgumentException;
020    
021    /**
022     * Policy used to create a pair of new chromosomes by performing a crossover
023     * operation on a source pair of chromosomes.
024     *
025     * @since 2.0
026     * @version $Id: CrossoverPolicy.java 1416643 2012-12-03 19:37:14Z tn $
027     */
028    public interface CrossoverPolicy {
029    
030        /**
031         * Perform a crossover operation on the given chromosomes.
032         *
033         * @param first the first chromosome.
034         * @param second the second chromosome.
035         * @return the pair of new chromosomes that resulted from the crossover.
036         * @throws MathIllegalArgumentException if the given chromosomes are not compatible with this {@link CrossoverPolicy}
037         */
038        ChromosomePair crossover(Chromosome first, Chromosome second) throws MathIllegalArgumentException;
039    }