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File org.dgpf.search.algorithms.ga.sorting.ComparatorBasedSorting.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-05-17 05:05:34
 * Original Filename: org.dgpf.search.algorithms.ga.sorting.ComparatorBasedSorting.java
 * Version          : 1.0.0
 * Last modification: 2006-05-17
 *                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.algorithms.ga.sorting;

import org.dgpf.search.algorithms.ga.SortingAlgorithm;
import org.dgpf.search.api.Individual;
import org.dgpf.search.api.IndividualComparator;
import org.sfc.collections.Arrays;

/**
 * This sorting algorithm sorts the individuals basing on the comparator
 * provided.
 *
 * @author Thomas Weise
 */

public class ComparatorBasedSorting extends SortingAlgorithm
  {
/**
 * The serial version uid.
 */

  private   static  final long    serialVersionUID        = 1;
/**
 * The shared instance of the no sorting sort algorithm.
 */

  public  static  final SortingAlgorithm  INSTANCE =
      new ComparatorBasedSorting();

/**
 * Prevent you from instantiating this class.
 */

  protected ComparatorBasedSorting()
    {
    super();
    }


  
/**
 * Sort the individuals so that they can be used by the selection algorithm
 * optimally.
 * @param p_individuals The array with the individuals to be sorted.
 * @param p_count       The count of individuals in that array.
 * @param p_comparator  The comparator to be used.
 * @param p_unsorted    This parameter is <code>false</code>, if and only
 *                      if the population is already sorted according to
 *                      the comparator provided. Otherwise it is
 *                      <code>true</code> indicating that list is not yet
 *                      sorted.
 */

  @Override
  public     void  sort  (final Individual<?>[]      p_individuals,
                          final int                  p_count,
                          final IndividualComparator p_comparator,
                          final boolean              p_unsorted)
    {
    if(p_unsorted) Arrays.sort(p_individuals, p_count, p_comparator);
    }


/**
 * 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 sorting algorithm instance.
 * @return A copy of this sorting algorithm instance.
 */

  @Override
  public  final Object  clone ()
    {
    return this;
    }
  

/**
 * Check whether this object equals another one.
 * @param p_object  The object to compare with.
 * @return <code>true</code> if and only if this object equals to the other
 *         one.
 */

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

File Information:

file name:ComparatorBasedSorting.java
package:org.dgpf.search.algorithms.ga.sorting
qualified name:org.dgpf.search.algorithms.ga.sorting.ComparatorBasedSorting.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/algorithms/ga/sorting/ComparatorBasedSorting.java
size:3.779 KB (3870 B)
uploaded: 2015-07-22 04:10:59 GMT+0000
last update: 2006-06-06 08:31:19 GMT+0000
last access: 2017-11-17 19:30:25 GMT+0000

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