Logo
Distributed Genetic Programming Framework
print print

File org.dgpf.gp.automaton.optimizer.Downsizer.java

Here you can find all the information about the file org.dgpf.gp.automaton.optimizer.Downsizer.java. You may explore it here or download it onto your local disk.
/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-02-08 10:20:09
 * Original Filename: org.dgpf.automaton.optimizer.Downsizer.java
 * Version          : 2.2.1
 * Last modification: 2006-05-08
 *                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.automaton.optimizer;

import org.dgpf.gp.automaton.base.Instruction;
import org.dgpf.gp.automaton.instructions.IfJump;
import org.sfc.utils.MultiBuffer;
import org.sfc.utils.Typesafe;

/**
 * This internal helper class is used to downsize code.
 *
 * @author Thomas Weise
 */

final class Downsizer
  {
/**
 * The downsizer cannot be instantiated, its purely static.
 */

  private Downsizer ()
    {
    Typesafe.do_not_call();
    }
  
  
/**
 * This method performs the downsizing of code.
 * @param p_source    The source program.
 * @param p_keep      The array of instructions to keep: it has at least
 *                    the same length as <code>p_source</code> and contains
 *                    a number <code>>0</code> at index <code>i</code>
 *                    if the instruction at index <code>i</code> should be
 *                    kept.
 * @param p_buffer    The buffer to use.
 * @return  An instruction array containing the refined program.
 */

  static  final Instruction[] downsize  (final Instruction[] p_source,
                                         final byte[]        p_keep,
                                         final MultiBuffer   p_buffer)
    {
          Instruction     l_in;
          IfJump          l_ij;
    final int[]           l_targets;
          int             l_l, l_i, l_j, l_q, l_t;
          Instruction[]   l_n;
          boolean         l_bb;

    l_l       = p_source.length;
    l_targets = p_buffer.get_ints(l_l, -1);
    
    l_j       = 0;
    l_bb      = true;

    for(l_i = 0; l_i < l_l; l_i++)
      {
      if(p_keep[l_i] > 0)
        {
        l_targets[l_i] = l_j;
        l_j++;
        }
      else l_bb = false;
      }

    if(l_bb) return p_source;    
    
    if(l_j <= 0) return Optimizer.EMPTY;
    
    l_t = 0;
    for(l_i = (l_l-1); l_i >= 0; l_i--)
      {
      l_q = l_targets[l_i];
      if(l_q >= 0) l_t            = l_q;
      else         l_targets[l_i] = l_t;
      }

    l_n = new Instruction[l_j];
    l_q = 0;

    for(l_i = 0; l_i < l_l; l_i++)
      {
      if(p_keep[l_i] > 0)
        {
        l_in = p_source[l_i];

        if(l_in instanceof IfJump)
          {
          l_ij = ((IfJump)l_in);
          l_t  = l_ij.get_target();

          if(l_targets[l_t] != l_t)
            {
            l_in = new IfJump(l_ij.get_condition(), l_targets[l_t]);
            }
          }

        l_n[l_q++] = l_in;
        }
      }

    return l_n;
    }
  }

File Information:

file name:Downsizer.java
package:org.dgpf.gp.automaton.optimizer
qualified name:org.dgpf.gp.automaton.optimizer.Downsizer.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/automaton/optimizer/Downsizer.java
size:3.603 KB (3690 B)
uploaded: 2015-07-22 04:10:55 GMT+0000
last update: 2006-05-08 13:38:46 GMT+0000
last access: 2017-11-17 21:16:58 GMT+0000

statistics online since 2006-01-02.   RSS Feed
Contact us by sending an email to tweise@gmx.de to receive further information, to report errors, or to join our project.
All content on this site (http://dgpf.sourceforge.net/) is LGPL-licensed.
http://dgpf.sourceforge.net/scripts/source/source.php last modified at 2015-07-22 04:10:53 GMT+0000 served at 2017-11-17 21:16:58 GMT+0000.
Valid CSS Valid XHTML 1.1
Valid RSS SourceForge.net Logo