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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Last modification: 2006-03-19
 * Original Filename: org.dgpf.netautomaton.fitness.TransmissionPressure.java
 * Version          : 2.3.1
 * Last modification: 2006-05-12
 *                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.gp.netautomaton.fitness;

import org.dgpf.gp.automaton.base.Program;
import org.dgpf.gp.netautomaton.base.NetContext;
import org.dgpf.gp.netautomaton.base.NetSupport;
import org.dgpf.search.api.FitnessData;
import org.dgpf.search.api.FitnessFunction;
import org.dgpf.search.api.SearchContext;

/**
 * The code size pressure fitness function is used to prevent programs from
 * performing too many transmissions.
 * 
 * @author Thomas Weise
 */

public class TransmissionPressure extends FitnessFunction<Program,
                                                      FitnessData<Program>>
  {
/**
 * The globally shared instance of the transmission pressure fitness function.
 */

  public  static  final FitnessFunction<Program, FitnessData<Program>>
    DEFAULT_INSTANCE = new TransmissionPressure(-1);
  
/**
 * Create a new transmission pressure fitness function.
 * 
 * @param p_precision   The precision of this fitness function. This is the
 *                      count of levels to be used for the calculation.
 *                      If this parameter is <= 0.0d, the full precision
 *                      available will be used.
 */

  private TransmissionPressure(final double p_precision)
    {
    super(-1, p_precision);
    }
  
/**
 * This method is called when a simulation has come to an end.
 * You must use this method to store a fitness value into the fitness
 * record <code>p_fitness</code>. Use <code>set_fitness</code> for this.
 * @param p_fitness       The fitness data record that was used in this
 *                        simulation.
 * @param p_context       The context that has driven the simulation.
 * @see FitnessData#set_fitness(double)
 */

  @Override
  protected  final  void end_simulation(
                            final FitnessData<Program>    p_fitness,
                            final SearchContext<Program>  p_context)
    {
    NetSupport  l_support;
    double      l_a;
    
    l_support = ((NetContext)p_context).get_net_support();
    
    l_a = l_support.get_transmission_count();
    if(l_a > 0)
      {
      p_fitness.set_fitness(1.0d /
                           (l_a * (1 + l_support.get_collission_count())));
      }
    else
      {
      p_fitness.set_fitness(0.0d);
      }
    }
  
/**
 * Returns a human readable name of this fitness function.
 * @return A human readable name of this fitness function.
 */

  @Override
  public  final  String  toString  ()
    {
    return "transmissions";
    }
  }

File Information:

file name:TransmissionPressure.java
package:org.dgpf.gp.netautomaton.fitness
qualified name:org.dgpf.gp.netautomaton.fitness.TransmissionPressure.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/netautomaton/fitness/TransmissionPressure.java
size:3.602 KB (3689 B)
uploaded: 2012-05-02 03:10:51 GMT+0000
last update: 2006-08-22 11:00:09 GMT+0000
last access: 2012-11-29 02:34:09 GMT+0000

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