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     * Algorithm used to select a chromosome pair from a population.
023     *
024     * @since 2.0
025     * @version $Id: SelectionPolicy.java 1416643 2012-12-03 19:37:14Z tn $
026     */
027    public interface SelectionPolicy {
028        /**
029         * Select two chromosomes from the population.
030         * @param population the population from which the chromosomes are choosen.
031         * @return the selected chromosomes.
032         * @throws MathIllegalArgumentException if the population is not compatible with this {@link SelectionPolicy}
033         */
034        ChromosomePair select(Population population) throws MathIllegalArgumentException;
035    }