/*----------------    FILE HEADER ---------------------------------------
 This file is part of Geoide.
 Copyright (C) 2005-2006 by:
 IDgis B.V.
 http://www.idgis.nl

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library 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
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

 Contact:

 Herman Assink
 IDgis bv
 P.O. Box 15
 7450 AA Holten
 The Netherlands
 E-Mail: herman.assink@idgis.nl

 * @version 1.4.0
 * @author IDgis team
 * 
 ------------------------------------------------------------------------*/
import nl.idgis.giclient.event.*;

class nl.idgis.giclient.event.StateEventDispatcher {
    
    private var eventListeners:Object = null; // Associative array;
    
    function StateEventDispatcher() {
        eventListeners = new Object();
    }
    
    function addEventListener(stateEventListener:StateEventListener, sourceClassName:String, actionType:Number, propertyName:String):Void {
        var key:String = sourceClassName.toUpperCase() + "_" + actionType + "_" + propertyName.toUpperCase();
        
        if (eventListeners[key] == null) {
            eventListeners[key] = new Array();
        } else {
            for (var i:String in eventListeners[key]) {
                if (eventListeners[key][i] == stateEventListener) {
                    // EXCEPTION
                    return;
                }
            }
        }
        
        eventListeners[key].push(stateEventListener);
    }
    
    function removeEventListener(stateEventListener:StateEventListener, sourceClassName:String, actionType:Number, propertyName:String):Void {
        var key:String = sourceClassName.toUpperCase() + "_" + actionType + "_" + propertyName.toUpperCase();
        
        if (eventListeners[key] == null) {
            // EXCEPTION
            return;
        }
        
        for (var i:String in eventListeners[key]) {
            if (eventListeners[key][i] == stateEventListener) {
                delete eventListeners[key][i];
                return;
            }
        }
        
        // EXCEPTION
        return;
    }
    
    function dispatchEvent(stateEvent:StateEvent):Void {
        var sourceClassName:String = stateEvent.getSourceClassName();
        var actionType:Number = stateEvent.getActionType();
        var propertyName:String = stateEvent.getPropertyName();
        var key:String = sourceClassName.toUpperCase() + "_" + actionType + "_" + propertyName.toUpperCase();
        
        if (eventListeners[key] == null) {
            return;
        }
        
        for (var i:Number = 0; i < eventListeners[key].length; i++) { // Dispatches the event in the same order as in which the listeners were added.
            StateEventListener(eventListeners[key][i]).onStateEvent(stateEvent);
        }
    }
    
}