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File org.dgpf.search.api.comparators.ZeroComparator.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-05-12 17:57:44
 * Original Filename: org.dgpf.search.api.comparators.DominationComparator.java
 * Version          : 2.0.1
 * Last modification: 2006-05-29
 *                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.comparators;

import org.dgpf.search.api.Individual;
import org.dgpf.search.api.IndividualComparator;

/**
 * This comparator checks only if some fitness functions are zero.
 *
 * @author Thomas Weise
 */

public class ZeroComparator  extends IndividualComparator
  {

/**
 * The serial version uid.
 */

  private static final long serialVersionUID = 1;

/**
 * The globally shared instance of this comparator.
 */

  public  static  final IndividualComparator  INSTANCE =
                                        new ZeroComparator();

/**
 * The internal constructor.
 */

  ZeroComparator()
    {
    super();
    }

/**
 * <p>
 * Compares its two individuals for fitness.  Returns a negative integer,
 * zero, or a positive integer as the first argument is fitter than, equal
 * to, or less fit than the second.
 * </p>
 * @param p_i1 The first individual to be compared.
 * @param p_i2 The second individual to be compared.
 * @return a negative integer, zero, or a positive integer as the
 *         first individual is fitter than, equal to, or less fit than the
 *         second.
 * @throws ClassCastException if the arguments' types prevent them from
 *         being compared by this Comparator.
 */

  @Override
  public  final int compare(final Individual<?>  p_i1,
                            final Individual<?>  p_i2)
    {
    int l_i, l_j, l_k, l_l, l_c;
    
    l_j = 0;
    l_k = 0;
    l_c = p_i1.get_fitness_function_count();
    for(l_i = (l_c-1); l_i > 0; l_i--)
      {
      l_l = 0;
      if(p_i1.get_fitness(l_i) <= 0)
        {
        l_j++;
        l_l = 1;
        }
      if(p_i2.get_fitness(l_i) <= 0)
        {
        l_j--;        
        if(l_l != 0) l_l = 0;
        else         l_l = -1;
        }
      
      if(l_l != 0)
        {
        l_k = (l_l*(l_c-l_i));
        }
      }

    if(l_j != 0)
      {
      if(l_j < 0) return (l_j - l_c);
      return (l_j + l_c);
      }
    
    return l_k;
    }


/**
 * Deserialize to the proper instance.
 * @return  The globally shared instance.
 */

  private  final Object readResolve()
    {
    return INSTANCE;
    }

/**
 * Perform a write replace of this object.
 * @return  The object to store.
 */

  private final Object writeReplace()
    {
    return INSTANCE;
    }


/**
 * Create of copy of this halt parameters instance.
 * @return A copy of this halt parameters instance.
 */

  @Override
  public  Object  clone ()
    {
    return INSTANCE;
    }
  
/**
 * Check whether this comparator equals another object.
 * @param p_object  The object to compare with.
 * @return <code>true</code> if and only if <code>p_object</code> is also
 *         an individual comparator and will always return the same result
 *         for all possible comparisons to be performed.
 */

  @Override
  public  final boolean equals  (final Object p_object)
    {
    return ((p_object == this) ||
            (p_object instanceof ZeroComparator));
    }
  }

File Information:

file name:ZeroComparator.java
package:org.dgpf.search.api.comparators
qualified name:org.dgpf.search.api.comparators.ZeroComparator.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/api/comparators/ZeroComparator.java
size:4.134 KB (4234 B)
uploaded: 2015-07-22 04:11:00 GMT+0000
last update: 2006-06-07 08:47:25 GMT+0000
last access: 2017-11-22 00:20:58 GMT+0000

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