/*

     dsh-evolve  Framework for evolutionary algorithms.

     Copyright (c) 2005-2013 held jointly by the individual authors.

     This library is free software; you can redistribute it and/or modify it

     under the terms of the GNU Lesser General Public License as published

     by the Free Software Foundation; either version 3 of the License, or (at

     your option) any later version.

     This library is distributed in the hope that it will be useful, but WITHOUT

     ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or

     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

     License for more details.

     You should have received a copy of the GNU Lesser General Public License

     along with this library;  if not, write to the Free Software Foundation,

     Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.

     > http://www.fsf.org/licensing/licenses/lgpl.html

     > http://www.opensource.org/licenses/lgpl-license.php

 */

 package org.dishevelled.evolve.fitness;

 import java.util.Random;

 import org.dishevelled.evolve.Fitness;

 /**

  * Random fitness function.

  *

  * @param <I> individual type

  * @author  Michael Heuer

  * @version $Revision: 225 $ $Date: 2007-01-08 23:25:51 -0600 (Mon, 08 Jan 2007) $

  */

 public final class RandomFitness<I>

     implements Fitness<I>

 {

     /** Source of randomness for this random fitness function. */

     private final Random random;

     /**

      * Create a new random fitness function with a default source of randomness.

      */

     public RandomFitness()

     {

         random = new Random();

     }

     /**

      * Create a new random fitness function with the specified source of randomness.

      *

      * @param random source of randomness for this random fitness function, must not be null

      */

     public RandomFitness(final Random random)

     {

         if (random == null)

         {

             throw new IllegalArgumentException("random must not be null");

         }

         this.random = random;

     }

     /** {@inheritDoc} */

     public Double score(final I individual)

     {

         return Double.valueOf(random.nextDouble());

     }

 }