com/ohrasys/app/AbstractAppController.java

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/* Copyright (C) 2004 Thomas N. Valine
 * tvaline@users.sourceforge.net
 *
 * 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 com.ohrasys.app;
import java.awt.event.*;
import java.util.*;
import java.util.concurrent.*;

public abstract class AbstractAppController
implements AppViewEventListener, AppModelEventListener {
  protected transient AppControllerEventListener model = null;

  protected AppOption options[] = null;

  protected ThreadFactory pool = Executors.defaultThreadFactory();

  protected transient List<AppControllerEventListener> views;

  public AbstractAppController(
      AbstractAppModel model, AbstractAppView view, AppOption options[])
    throws AppException {
    this.options = options;
    try {
      model.setController(this);
      view.setController(this);
      setModel(model);
      addView(view);
    } catch(TooManyListenersException e) {
      throw new AppException(e.getMessage());
    }
  }

  public abstract ActionEvent processEvent(ActionEvent evt);

  public abstract void startController();

  public final void actionPerformed(ActionEvent evt) {
    ActionEvent event = processEvent(evt);
    notifyModel(event);
    notifyViews(event);
  }

  public synchronized void addView(AppControllerEventListener view) {
    if(views == null){views = new ArrayList<AppControllerEventListener>();}
    views.add(view);
  }

  public synchronized void removeView(AppControllerEventListener view) {
    if(views != null){views.remove(view);}
  }

  public String toString(){return super.toString();}

  protected void notifyModel(ActionEvent event) {
    if((model == null) || (event == null)){return;}
    final AppControllerEventListener mod = model;
    final ActionEvent                evt = event;
    pool.newThread(new Runnable() {
        public void run(){mod.actionPerformed(evt);}
      }).start();
  }

  protected void notifyViews(ActionEvent event) {
    List list;
    synchronized(this) {
      if((views == null) || (event == null)){return;}
      list = (List)((ArrayList)views).clone();
    }
    final ActionEvent evt = event;
    for(int i = 0;i < list.size();i++) {
      final AppControllerEventListener view = (AppControllerEventListener)list
          .get(i);
      pool.newThread(new Runnable() {
          public void run(){view.actionPerformed(evt);}
        }).start();
    }
  }

  protected synchronized void setModel(AppControllerEventListener model)
    throws TooManyListenersException {
    if(model == null){this.model = null;}
    else {
      if(this.model != null){throw new TooManyListenersException();}
      this.model = model;
    }
  }
} // end class AbstractAppController


/* This material is distributed under the GNU General Public License.
 * For more information please go to http://www.gnu.org/copyleft/gpl.html */

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