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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-05-11 11:10:48
 * Original Filename: org.dgpf.search.algorithms.hc.p2p.adaptation.DefaultP2PHCAdapter.java
 * Version          : 1.0.0
 * Last modification: 2006-05-11
 *                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.search.algorithms.hc.p2p.adaptation;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.dgpf.search.algorithms.hc.adaptation.DefaultHCAdapter;
import org.dgpf.search.algorithms.hc.p2p.P2PHCParameters;
import org.dgpf.search.algorithms.hc.p2p.P2PHCState;
import org.dgpf.search.api.AdaptationStrategy;
import org.dgpf.search.api.SearchState;
import org.dgpf.search.api.p2p.P2PAdaptationStrategy;
import org.dgpf.search.api.p2p.P2PParameters;
import org.dgpf.search.api.p2p.adaptation.NoP2PAdaptation;
import org.sfc.utils.Typesafe;


/**
 * The default adapter for peer-to-peer extended hill climbing searches.
 *
 * @author Thomas Weise
 */

public class DefaultP2PHCAdapter extends DefaultHCAdapter
  {
/**
 * The serial version uid.
 */

  private static final long serialVersionUID            = 1;

  
/**
 * The peer-to-peer adaptation strategy.
 */

  private transient P2PAdaptationStrategy m_p2p_adapt ;

/**
 * Create a new stateful adaptation strategy.
 * @param p_parameters  The search parameter set to be adapted.
 */

  public DefaultP2PHCAdapter(final P2PHCParameters<?> p_parameters)
    {
    super(p_parameters);
    this.m_p2p_adapt = this.create_p2p_adapter(
                              p_parameters.get_p2p_parameters());
    }

/**
 * Create a new stateful adaptation strategy by using another search
 * adaptation strategy as blueprint.
 * @param p_parameters  The search parameter set to be adapted.
 * @param p_strategy    The blueprint to copy the internal data from.
 */

  public  DefaultP2PHCAdapter(final P2PHCParameters<?> p_parameters,
                                   final AdaptationStrategy      p_strategy)
    {
    super(p_parameters, p_strategy);
    this.m_p2p_adapt = this.create_p2p_adapter(
                              p_parameters.get_p2p_parameters());
    }
  
/**
 * The internal routine used to create the adaptation strategy for the
 * peer-to-peer-nodes.
 * @param p_parameters  The parameter set to adapt.
 * @return  The new p2p-adaptation strategy.
 */

  protected P2PAdaptationStrategy create_p2p_adapter(
                              final P2PParameters p_parameters)
    {
    return NoP2PAdaptation.INSTANCE;//new DefaultP2PAdapter(p_parameters);
    }

/**
 * Obtain the peer-to-peer adaptation strategy.
 * @return The peer-to-peer adaptation strategy.
 */

  public  final P2PAdaptationStrategy get_p2p_adaptation_strategy ()
    {
    return this.m_p2p_adapt;
    }

/**
 * Set the peer-to-peer adaptation strategy.
 * @param p_strategy The peer-to-peer adaptation strategy to be used.
 */

  public  final void  set_p2p_adaptation_strategy
                        (final P2PAdaptationStrategy p_strategy)
    {
    P2PHCParameters<?> l_g;

    if(p_strategy != null)
      {
      l_g = Typesafe.cast(this.get_parameters());
      l_g.get_p2p_parameters().notify_strategy(p_strategy);
      this.m_p2p_adapt = p_strategy;
      }
    }

/**
 * This method will be called by the search engine whenever it feels like
 * it is time to adapt the current search parameters to the current search
 * state. If you override this method, you must also declare your class
 * as instance of <code>ICloneable</code>.
 * @param p_state The current state of the search.
 * @return  <code>true</code> if and only if the update level should be
 *          resetted, <code>false</code> if everything should continue
 *          normal.
 * @see SearchState#get_update_level()
 */

  @Override
  protected boolean  adapt (final SearchState<?> p_state)
    {
    P2PHCState<?> l_p;

    if(super.adapt(p_state)) return true;

    l_p = Typesafe.cast(p_state);
    return this.m_p2p_adapt.adapt(p_state, l_p.get_p2p_state());
    }

/**
 * This method will be called whenever the search parameters perform a
 * reset, meaning that the search level is set back to 0.
 */

 @Override
  public void  reset ()
    {
    super.reset();
    this.m_p2p_adapt.reset();
    }



/**
 * Stores the <code>SfcEvent</code> into the stream.
 * @param p_s The output stream.
 * @throws  IOException If something io-like went wrong.
 */

  private final void writeObject(final ObjectOutputStream p_s)
        throws IOException
    {
    p_s.defaultWriteObject();
    p_s.writeUnshared(this.m_p2p_adapt);
    }



/**
 * Reconstitute the <code>SfcEvent</code> instance from a stream (that is,
 * deserialize it).
 * @param p_s The input stream.
 * @throws  IOException If something io-like went wrong.
 * @throws  ClassNotFoundException  If a needed class could not be found.
 */

  private final void readObject(final ObjectInputStream p_s)
        throws IOException, ClassNotFoundException
    {
    P2PAdaptationStrategy   l_c;
    P2PHCParameters<?> l_p;

    p_s.defaultReadObject();
    l_c = ((P2PAdaptationStrategy)(p_s.readUnshared()));
    l_p = Typesafe.cast(this.get_parameters());
    l_p.get_p2p_parameters().notify_strategy(l_c);
    this.m_p2p_adapt = l_c;
    }
  }

File Information:

file name:DefaultP2PHCAdapter.java
package:org.dgpf.search.algorithms.hc.p2p.adaptation
qualified name:org.dgpf.search.algorithms.hc.p2p.adaptation.DefaultP2PHCAdapter.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/algorithms/hc/p2p/adaptation/DefaultP2PHCAdapter.java
size:6.148 KB (6296 B)
uploaded: 2015-07-22 04:10:59 GMT+0000
last update: 2006-05-11 11:18:04 GMT+0000
last access: 2017-11-18 23:19:26 GMT+0000

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