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

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/*
 * 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: 2015-07-22 04:10:58 GMT+0000
last update: 2006-07-11 03:17:36 GMT+0000
last access: 2017-11-22 07:31:03 GMT+0000

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