/*
 * 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;

/**
 * A pair of {@link Chromosome} objects.
 * 
 * @since 2.0
 * 
 * @version $Revision$ $Date$
 */
public class ChromosomePair {
	/** the first chromosome in the pair. */
	private final Chromosome first;

	/** the second chromosome in the pair. */
	private final Chromosome second;

	/**
	 * Create a chromosome pair.
	 * 
	 * @param c1
	 *            the first chromosome.
	 * @param c2
	 *            the second chromosome.
	 */
	public ChromosomePair(final Chromosome c1, final Chromosome c2) {
		super();
		first = c1;
		second = c2;
	}

	/**
	 * Access the first chromosome.
	 * 
	 * @return the first chromosome.
	 */
	public Chromosome getFirst() {
		return first;
	}

	/**
	 * Access the second chromosome.
	 * 
	 * @return the second chromosome.
	 */
	public Chromosome getSecond() {
		return second;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String toString() {
		return String.format("(%s,%s)", getFirst(), getSecond());
	}
}
