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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-27 14:43:24
 * Original Filename: org.dgpf.search.api.utils.WeightedMutator2.java
 * Version          : 1.0.0
 * Last modification: 2006-07-27
 *                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;
import org.sfc.math.stochastic.Randomizer;

/**
 * This class allows you to use different mutation techniques with assigned
 * probability weights.
 * @param <Genotype>    The type of the things to be mutated.
 * @param <Contexttype> The sort of context to be used.
 * @param <Infotype>    An information object to be propagated. If no
 *                      information object is needed, just leave this
 *                      parameter <code>Object</code> and always pass in
 *                      <code>null</code>.
 * @author Thomas Weise
 */

public class      WeightedMutator2<Genotype extends Serializable,
                                  Contexttype extends SearchContext<?>,
                                  Infotype>
       extends    WeightedMutator<Genotype, Contexttype, Infotype>
  {  
/**
 * The serial version uid.
 */

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

  public  WeightedMutator2(final WeightedSetBuilder<IMutator
                                <Genotype, Contexttype, Infotype>> p_wsb)
    {
    super(p_wsb);
    }
  

/**
 * Perform the mutation.
 * @param p_source  The source object to create a randomizedly altered
 *                  copy of.
 * @param p_context The context hosting the operation.
 * @param p_info    The information record.
 * @return  The new, randomizedly altered copy of the object
 *          <code>p_source</code> or <code>p_source</code> itself if no
 *          mutation was possible.
 */

  @Override
  public final      Genotype  mutate  (      Genotype    p_source,
                                       final Contexttype p_context,
                                       final Infotype    p_info)
    {
    WeightedSet<IMutator<Genotype, Contexttype, Infotype>>.Session l_s;
    Genotype                                                       l_g;
    int                                                            l_i;
    Randomizer                                                     l_r;
    
    
    l_r = p_context.get_randomizer();
main:
    for(l_i = Math.max(1,((int)(l_r.exponential()))); l_i > 0; l_i--)
      {
      l_s = this.open_session(l_r);    
      while(l_s.hasNext())
        {
        l_g = l_s.next().mutate(p_source, p_context, p_info);
        
        if((l_g != p_source) && (l_g != null) && (!(l_g.equals(p_source))))
          {
          l_s.close();
          p_source = l_g;
          continue main;
          }
        }
      
      l_s.close();
      return p_source;
      }
    
    return p_source;
    }
  }

File Information:

file name:WeightedMutator2.java
package:org.dgpf.search.api.utils
qualified name:org.dgpf.search.api.utils.WeightedMutator2.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/api/utils/WeightedMutator2.java
size:3.906 KB (4000 B)
uploaded: 2012-05-02 03:11:05 GMT+0000
last update: 2006-08-01 10:52:11 GMT+0000
last access: 2012-11-28 07:43:32 GMT+0000

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