---

TMutableObservable.java

/*
*  Name:      TMutableObservable.java
*  Author:    Rafael Jesus Alcantara Perez
*  Summary:   Mutable observable class
*  Date:      $Date: 2003/08/16 11:33:18 $
*  Revision:  $Revision: 1.1 $
*
*  Copyright (C) 2003  Rafael Jesus Alcantara Perez <rafa@dedalo-ing.com>
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
*  MA 02111-1307, USA.
*/

package org.mpcl.designpatterns.behavioral;

import java.util.Iterator;
import java.util.Observable;
import java.util.Vector;


public class TMutableObservable extends Observable implements IMutable
{

  private boolean   gNeedMutation;

  protected Vector   tMutatorVector;


  //
  //  C O N S T R U C T O R S
  //

  protected void clearNeedMutation()
  {
    gNeedMutation = false;
  }


  //
  //  C O N S T R U C T O R S
  //

  public TMutableObservable()
  {
    gNeedMutation  = false;
    tMutatorVector = new Vector();
  }

  public void addMutator (IMutator tMUTATOR)
  {
    tMutatorVector.add (tMUTATOR);
  }

  public void deleteMutator (IMutator tMUTATOR)
  {
    tMutatorVector.remove (tMUTATOR);
  }

  public void deleteMutators()
  {
    tMutatorVector.removeAllElements();
  }

  public void setNeedMutation()
  {
    gNeedMutation = true;
  }


  //
  //  S E L E C T O R S
  //

  public int countMutators()
  {
    return tMutatorVector.size();
  }

  public boolean needMutation()
  {
    return gNeedMutation;
  }

  public void notifyMutators()
  {
    notifyMutators (null);
  }

  public void notifyMutators (Object tARGUMENT)
  {

    if ( needMutation() )
    {
      IMutator   tMutator;
      Iterator   I = tMutatorVector.iterator();
      
      while ( I.hasNext() )
      {
        tMutator = (IMutator) I.next();
        tMutator.update (this, tARGUMENT);
      }
      clearNeedMutation();
      setChanged();
    }

  }  // notifyMutators()

}  // class TMutableObservable

---