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File org.dgpf.search.api.events.DefaultSearchListener.java

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/*
 * Copyright (c) 2006 Thomas Weise
 *
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-04-10 11:13:21
 * Original Filename: org.dgpf.searc.apih.events.DefaultSearchListener.java
 * Version          : 2.0.0
 * Last modification: 2006-05-08
 *                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.api.events;

import org.dgpf.search.api.SearchState;
import org.sfc.events.EventOutput;
import org.sfc.meta.MetaInformationWriter;
import org.sfc.parallel.events.DefaultParallelListener;
import org.sfc.utils.Typesafe;


/**
 * This default search event listener provides the default ability to
 * print events thrown by a search engine in a human readable form.
 *
 * @author Thomas Weise
 */

public class DefaultSearchListener  extends DefaultParallelListener
  {
/**
 * The search reset event handler.
 */

  public  static  final EventHandler<SearchResetEvent>
                                    SEARCH_RESET_EVENT_HANDLER =
        new EventHandler<SearchResetEvent>()
    {
    @Override
    protected final void handle_event(final SearchResetEvent  p_event,
                                      final EventOutput          p_output)
      {
      Object l_o;

      l_o = p_event.getSource();
      if(l_o != null)
        {
        p_output.write(l_o.toString());
        }

      p_output.write(" has been resetted. " +
                     "The current update level is now zero again.");
      }
    };


/**
 * The search update event handler.
 */

  protected  static  final EventHandler<SearchUpdateEvent>
                                    SEARCH_UPDATE_EVENT_HANDLER =
        new EventHandler<SearchUpdateEvent>()
    {
    @Override
    protected final void handle_event(final SearchUpdateEvent  p_event,
                                      final EventOutput        p_output)
      {
      SearchUpdateEvent<?> l_su;
      SearchState<?>       l_o;


      l_su = Typesafe.cast(p_event);

      l_o = l_su.get_state();
      if((l_o.get_update_count() %
              ((DefaultSearchListener)p_output).m_mod) == 0)
        {
        MetaInformationWriter.print_default(l_o, p_output);        
        p_output.write_linebreak();
        }
      }
    };

/**
 * The modulo for the event output.
 */

  final int m_mod ; 
    
/**
 * Create a new search event output listener.
 * @param p_out             The output stream to write to.
 * @param p_mod             The event output modulo.
 * @param p_default_indent  The default indentation step width.
 */

  public  DefaultSearchListener(final Object p_out,
                                final int    p_mod,
                                final int    p_default_indent)
    {
    super(p_out, p_default_indent);
    this.add_handler(SearchUpdateEvent.class,
                                SEARCH_UPDATE_EVENT_HANDLER);
    this.add_handler(SearchResetEvent.class,
                                SEARCH_RESET_EVENT_HANDLER);
    this.m_mod = ((p_mod > 1) ? p_mod : 1); 
    }
  
/**
 * Create a new search event output listener.
 * @param p_out             The output stream to write to.
 * @param p_mod             The event output modulo.
 */

  public  DefaultSearchListener(final Object p_out,
                                final int    p_mod)
    {
    this(p_out, p_mod, -1);
    }
  
/**
 * Create a new search event output listener.
 * @param p_out             The output stream to write to.
 */

  public  DefaultSearchListener(final Object p_out)
    {
    this(p_out, -1, -1);
    }
  }

File Information:

file name:DefaultSearchListener.java
package:org.dgpf.search.api.events
qualified name:org.dgpf.search.api.events.DefaultSearchListener.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/api/events/DefaultSearchListener.java
size:4.311 KB (4415 B)
uploaded: 2015-07-22 04:11:00 GMT+0000
last update: 2006-05-11 10:41:43 GMT+0000
last access: 2017-11-20 02:21:13 GMT+0000

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