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

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-03 07:02:36
 * Original Filename: org.dgpf.gp.vm.instructions.arith.ExchangeHandler.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.MemInstr2Handler;
import org.dgpf.gp.vm.mutation.MutationInfo;

/**
 * The instruction handler for the exchange instruction.
 *
 * @author Thomas Weise
 */

public final  class ExchangeHandler  extends MemInstr2Handler
  {
/**
 * The serial version uid.
 */

  private static final long serialVersionUID = 1;
/**
 * The globally shared instance of the exchange handler.
 */

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

  private ExchangeHandler()
    {
    super(null);
    }
  

/**
 * 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)
    {
    Addresses l_a;
    
    l_a = new Addresses(2, p_context, p_info);
    
    return new Exchange(l_a.m_addr[0], l_a.m_rel[0],
                        l_a.m_addr[1], l_a.m_rel[1]);
    }
  
  
/**
 * 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  Instruction try_melt  (final Instruction p_first,
                                 final Instruction p_second)
    {
    Exchange  l_e1, l_e2;
    
    if((p_first) instanceof Exchange)
      {
      l_e1 = ((Exchange)p_first);
      l_e2 = ((Exchange)p_second);
      
      if( (l_e1.get_addr_1()    == l_e2.get_addr_1())     &&
          (l_e1.get_addr_2()    == l_e2.get_addr_2())     &&
          (!(l_e1.is_relative_1())) && (!(l_e2.is_relative_1()))  &&
          (!(l_e1.is_relative_2())) && (!(l_e2.is_relative_2()) ))
        {
        return p_second;
        }
      }
    
    return super.try_melt(p_first, p_second);
    }
  

/**
 * Get an instruction that better represents the passed in instruction.
 * @param p_i   The instruction to replace.
 * @return  An instruction that better represents <code>p_i</code>, or
 *          <code>p_i</code> if it is already perfect, or <code>null</code>
 *          if <code>p_i</code> itself is totally useless.
 */

  @Override
/**
 * Get an instruction that better represents the passed in instruction.
 * @param p_i   The instruction to replace.
 * @return  An instruction that better represents <code>p_i</code>, or
 *          <code>p_i</code> if it is already perfect, or <code>null</code>
 *          if <code>p_i</code> itself is totally useless.
 */

  public final  Instruction get_replacement (final Instruction p_i)
    {
    Exchange l_e;
    
    l_e = ((Exchange)p_i);
    
    if( (l_e.get_addr_1() == l_e.get_addr_2()) &&
        (l_e.is_relative_1() == l_e.is_relative_2()) ) return null;
    
    return p_i;
    }
  }

File Information:

file name:ExchangeHandler.java
package:org.dgpf.gp.vm.instructions.arith
qualified name:org.dgpf.gp.vm.instructions.arith.ExchangeHandler.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/vm/instructions/arith/ExchangeHandler.java
size:4.574 KB (4684 B)
uploaded: 2015-07-22 04:10:58 GMT+0000
last update: 2006-07-16 06:45:15 GMT+0000
last access: 2017-11-18 23:19:55 GMT+0000

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