/*
* Copyright 2003-2010 Tufts University  Licensed under the
 * Educational Community License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may
 * obtain a copy of the License at
 * 
 * http://www.osedu.org/licenses/ECL-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS"
 * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package edu.tufts.vue.preferences.generics;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import edu.tufts.vue.preferences.VuePrefEvent;
import edu.tufts.vue.preferences.VuePrefListener;
import edu.tufts.vue.preferences.implementations.AutoZoomPreference;
import edu.tufts.vue.preferences.interfaces.VuePreference;

public abstract class BasePref<T> implements VuePreference<T> {
    protected final List<VuePrefListener> _listeners = new ArrayList();	  	  	  	  	  
		 	
    public static Class getPrefRoot()
    {
        return edu.tufts.vue.preferences.PreferencesManager.class;
    }
	  	
    public synchronized void addVuePrefListener( VuePrefListener l, boolean callbackWithInitialValue ) {
        _listeners.add( l );
        if (callbackWithInitialValue)
            l.preferenceChanged(new VuePrefEvent(this, null, getValue()));
    }
	    
    public void addVuePrefListener( VuePrefListener l ) {
        addVuePrefListener(l, false);
    }
    
    public synchronized void removeMoodListener( VuePrefListener l ) {
        _listeners.remove( l );
    }
	     
    protected synchronized void _fireVuePrefEvent() {
        final VuePrefEvent event = new VuePrefEvent(this, getPreviousValue(), getValue());
	        
        for (VuePrefListener target : _listeners) {
            try {
                target.preferenceChanged(event);
            } catch (Throwable t) {
                System.err.println("exception delivering preferenceChanged event "
                                   + event
                                   + " to " + tufts.Util.tags(target));
                t.printStackTrace();
            }
        }
    }
}