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File org.dgpf.search.api.utils.WeightedCrossover.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-26 13:57:05
 * Original Filename: org.dgpf.search.api.utils.WeightedCrossover.java
 * Version          : 1.0.0
 * Last modification: 2006-07-26
 *                by: Thomas Weise
 * 
 * License          : GNU LESSER GENERAL PUBLIC LICENSE
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 *                    
 * Warranty         : This software is provided "as is" without any
 *                    warranty; without even the implied warranty of
 *                    merchantability or fitness for a particular purpose.
 *                    See the Gnu Lesser General Public License for more
 *                    details.
 */

 
package org.dgpf.search.api.utils;

import java.io.Serializable;

import org.dgpf.search.api.SearchContext;

/**
 * This class allows you to use different crossover techniques with
 * assigned probability weights.
 * @param <Genotype>    The type of the things to be crossovered.
 * @param <Contexttype> The sort of context to be used.
 * 
 * @author Thomas Weise
 */

public class WeightedCrossover<Genotype extends Serializable,
                               Contexttype extends SearchContext<?>>
       extends    WeightedSet<ICrossover<Genotype, Contexttype>>
       implements ICrossover<Genotype, Contexttype>
  {

/**
 * The serial version uid.
 */

  private static final long serialVersionUID = 1;
  
/**
 * Create a new weighted crossover set. Weighted crossover sets are fixed
 * and cannot be modified.
 * @param p_wsb The weighted set builder to use. 
 */

  public  WeightedCrossover(final WeightedSetBuilder<ICrossover
                                <Genotype, Contexttype>> p_wsb)
    {
    super(p_wsb);
    }
  

/**
 * Perform the crossover.
 * @param p_parent_1    The first parent individual.
 * @param p_parent_2    The second parent individual.
 * @param p_context     The hosting search context.
 * @return  The new individual which consists of parts of both parent
 *          individuals.
 */

  public  final Genotype  crossover(final Genotype    p_parent_1,
                                    final Genotype    p_parent_2,
                                    final Contexttype p_context)
    {
    WeightedSet<ICrossover<Genotype, Contexttype>>.Session l_s;
    Genotype                                               l_g;
    
    l_s = this.open_session(p_context.get_randomizer());
    
    while(l_s.hasNext())
      {
      l_g = l_s.next().crossover(p_parent_1, p_parent_2, p_context);
      
      if((l_g != p_parent_1) && (l_g != p_parent_2) && (l_g != null))
        {
        l_s.close();
        return l_g;
        }
      }
    
    l_s.close();
    return (p_context.get_randomizer().nextBoolean() ? p_parent_1
                                                     : p_parent_2);
    }
  }

File Information:

file name:WeightedCrossover.java
package:org.dgpf.search.api.utils
qualified name:org.dgpf.search.api.utils.WeightedCrossover.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/api/utils/WeightedCrossover.java
size:3.25 KB (3328 B)
uploaded: 2012-05-02 03:11:05 GMT+0000
last update: 2006-07-26 11:04:27 GMT+0000
last access: 2012-11-23 16:45:00 GMT+0000

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