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File org.dgpf.gp.vm.instructions.arith.SetZeroFlagHandler.java

Here you can find all the information about the file org.dgpf.gp.vm.instructions.arith.SetZeroFlagHandler.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    : 2006-07-03 09:40:46
 * Original Filename: org.dgpf.gp.vm.instructions.arith.SetZeroFlagHandler.java
 * Version          : 1.0.0
 * Last modification: 2006-07-03
 *                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.vm.instructions.arith;

import org.dgpf.gp.vm.base.IInstructionHandler;
import org.dgpf.gp.vm.base.Instruction;
import org.dgpf.gp.vm.base.VMContext;
import org.dgpf.gp.vm.instructions.base.NoMemInstrHandler;
import org.dgpf.gp.vm.mutation.MutationInfo;
import org.sfc.math.stochastic.Randomizer;


/**
 * The instruction handler for the set-zero-flag instruction.
 *
 * @author Thomas Weise
 */

public final class SetZeroFlagHandler extends NoMemInstrHandler
  {
/**
 * The serial version uid.
 */

  private static final long serialVersionUID = 1;
/**
 * The different set zero flag instructions.
 */

  private static  final Instruction[] SZF = new Instruction[]
    {SetZeroFlag.SET_FLAG, SetZeroFlag.CLEAR_FLAG,
     SetZeroFlag.TOGGLE_FLAG};
/**
 * The globally shared instance of the set zero flag handler.
 */

  public  static  final IInstructionHandler  INSTANCE =
                                        new SetZeroFlagHandler();
  
/**
 * Create a new set zero flag handler - you cannot do this, use the shared
 * instance.
 * @see #INSTANCE
 */

  private SetZeroFlagHandler()
    {
    super();
    }
  
/**
 * Create a new randomized instance of this instruction.
 * @param p_context The vm context to be used.
 * @param p_info    The information record holding the infos on the
 *                  instruction to be created.
 * @return  The new instruction instance.
 */

  public  final     Instruction create      (final VMContext    p_context,
                                             final MutationInfo p_info)
    {
    return SZF[p_context.get_randomizer().nextInt(SZF.length)];
    }
  
/**
 * 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.
 */

  public  final Instruction mutate  (final Instruction    p_source,
                                     final VMContext      p_context,
                                     final MutationInfo   p_info)
    {
    Randomizer  l_r;
    int         l_i;
    Instruction l_c;
    
    l_i = SZF.length;
    l_r = p_context.get_randomizer();
    
    do
      {
      l_c = SZF[l_r.nextInt(l_i)];
      } while(l_c == p_source);
    
    return l_c;
    }
  

/**
 * This method tells if this instruction can be useful at the end of a
 * procedure. A comparison, for example, will never be useful, since
 * its result will always get lost.
 * @return <code>true</code> if and only if an instruction is useful at the
 *         end of a procedure.
 */

  @Override
  public boolean is_useful_at_end()
    {
    return false;
    }
  

/**
 * Try to melt two instructions together. The second instruction is of
 * the type this instruction handler handles.
 * @param p_first   The first instruction.
 * @param p_second  The second instruction.
 * @return  An instruction able to replace the sequence of these both
 *          instructions, or <code>null</code> if no valid replacement
 *          coult be found.
 */

  @Override
  public  final Instruction try_melt  (final Instruction p_first,
                                       final Instruction p_second)
    {
    if( (p_first instanceof SetZeroFlag) || (p_first instanceof Compare) )
      {
      return p_second;
      }
    
    return super.try_melt(p_first, p_second);
    }
  }

File Information:

file name:SetZeroFlagHandler.java
package:org.dgpf.gp.vm.instructions.arith
qualified name:org.dgpf.gp.vm.instructions.arith.SetZeroFlagHandler.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/vm/instructions/arith/SetZeroFlagHandler.java
size:4.708 KB (4822 B)
uploaded: 2018-01-07 12:03:35 GMT+0000
last update: 2006-07-11 03:17:36 GMT+0000
last access: 2018-01-07 12:03:35 GMT+0000

statistics online since 2006-01-02.   RSS Feed
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Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 16

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 16
last modified at 2018-01-07 12:03:34 GMT+0000
Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 19

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 19
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