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File org.dgpf.gp.netautomaton.instructions.SendWordHandler.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-02-07 07:26:46
 * Original Filename: org.dgpf.netautomaton.expressions.SendWordHandler.java
 * Version          : 2.2.1
 * Last modification: 2006-05-08
 * Last modified 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.netautomaton.instructions;

import org.dgpf.gp.automaton.base.Expression;
import org.dgpf.gp.automaton.base.Instruction;
import org.dgpf.gp.automaton.search.InstructionHandler;
import org.dgpf.gp.automaton.search.Mutator;
import org.dgpf.gp.automaton.search.ProgramContext;
import org.dgpf.gp.netautomaton.expressions.ReceiveWord;
import org.sfc.collections.Arrays;
import org.sfc.utils.Typesafe;

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

final class SendWordHandler  extends InstructionHandler<SendWord>
  {

/**
 * Mutate the send-word expression.
 */

  private static final Mutator<Instruction, SendWord> MUTATE_EXPRESSION =
                   new Mutator<Instruction, SendWord>()
    {
/**
 * Mutate an existing instance of the genotype.
 * @param p_source        The source instance.
 * @param p_context     The program context to be used.
 * @param p_instruction_count The count of instructions of the program
 *                            the mutated instruction will be part of.
 * @param p_memory_size   The memory size currently available.
 * @return The randomly mutated copy of the source or <code>p_source</code>
 *         itself if it cannot be mutated in any way.
 */

    @Override
    protected Instruction mutate(final  SendWord        p_source,
                                 final  ProgramContext  p_context,
                                 final  int             p_instruction_count,
                                 final  int             p_memory_size)
      {
      return new SendWord(p_context.mutate_expression(
                          p_source.get_what(), false,
                          p_memory_size));
      }
    };


/**
 * The possible mutators of the sleepinstruction.
 */

  private static  final Mutator<Instruction, SendWord>[] MUTATORS =
                                       Arrays.create(MUTATE_EXPRESSION);
/**
 * The frequencies at which the mutations are selected.
 */

  private static  final double[]  FREQUENCIES = {1.0d};

/**
 * The singleton handler for if instructions.
 */

  static final InstructionHandler<Instruction>
                            INSTANCE = Typesafe.cast(new SendWordHandler());
  
/**
 * Create a new sendword handler.
 */

  private SendWordHandler()
    {
    super(MUTATORS, FREQUENCIES);
    }

/**
 * Create a new, random instance of the genotype.
 * @param p_context     The program context to be used.
 * @param p_instruction_count The count of instructions of the program
 *                            the new instruction will be part of.
 * @param p_memory_size   The memory size currently available.
 * @return  The random genotype instance.
 */

  @Override
  public final Instruction create(final ProgramContext  p_context,
                                  final int             p_instruction_count,
                                  final int             p_memory_size)
    {
    Expression  l_ex;
    
    do
      {
      l_ex = p_context.create_expression(false, false, p_memory_size);
      } while (l_ex instanceof ReceiveWord);
    return new SendWord(l_ex);
    }



/**
 * This method returns an optimized version of the source instruction,
 * or the source instruction itself if it cannot be optimized.
 * @param p_source  The source instruction.
 * @return  An optimized version of the source instruction,
 *          or the source instruction itself if it cannot be optimized.
 */

  @Override
  public final  Instruction optimize     (final SendWord   p_source)
    {
    Expression  l_ex, l_w;

    l_w  = p_source.get_what();
    l_ex = l_w;
    l_ex = l_ex.get_handler().optimize(l_ex);
    
    if( (l_ex != null) && (l_ex != l_w) )
      {
      p_source.init(l_ex);
      }

    return p_source;
    }
  
/**
 * Checks wether this instruction is practically useless.
 * @param p_source            The instruction to check.
 * @param p_position          The position this instruction can be found at.
 * @return  <code>true</code> if and only if leaving this instruction away
 *          will not change the program's functionality.
 */

  @Override
  public final   boolean is_useless  (final SendWord   p_source,
                                      final int        p_position)
    {
    if(super.is_useless(p_source, p_position)) return true;
    return (p_source.get_what() instanceof ReceiveWord);
    }
  }

File Information:

file name:SendWordHandler.java
package:org.dgpf.gp.netautomaton.instructions
qualified name:org.dgpf.gp.netautomaton.instructions.SendWordHandler.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/netautomaton/instructions/SendWordHandler.java
size:5.514 KB (5647 B)
uploaded: 2015-07-22 04:10:56 GMT+0000
last update: 2006-06-09 03:06:03 GMT+0000
last access: 2017-11-21 15:40:49 GMT+0000

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