com/ohrasys/app/AbstractAppView.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.*;

public abstract class AbstractAppView
implements AppControllerEventListener {
  protected transient AppViewEventListener controller = null;

  public void actionPerformed(ActionEvent evt) {
    ActionEvent response = processEvent(evt);
    if(response != null){notifyController(response);}
  }

  public synchronized void setController(AppViewEventListener controller)
    throws TooManyListenersException {
    if(controller == null){this.controller = null;}
    else {
      if(this.controller != null){throw new TooManyListenersException();}
      this.controller = controller;
    }
  }

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

  protected abstract ActionEvent processEvent(ActionEvent evt);

  protected void notifyController(ActionEvent event) {
    if(controller == null){return;}
    controller.actionPerformed(event);
  }
} // end class AbstractAppView


/* 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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