(function (){
	
	var FWDEventDispatcher = function (){
		
	    this.listeners = {events_ar:[]};
	     
	    this.addListener = function (type, listener){
	    	
	    	if(type == undefined) throw Error("type is required.");
	    	if(typeof type === "object") throw Error("type must be of type String.");
	    	if(typeof listener != "function") throw Error("listener must be of type Function.");
	    	
	    	
	        var event = {};
	        event.type = type;
	        event.listener = listener;
	        event.target = this;
	        this.listeners.events_ar.push(event);
	    };
	    
	    this.dispatchEvent = function(type, props){
	    	if(this.listeners == null) return;
	    	if(type == undefined) throw Error("type is required.");
	    	if(typeof type === "object") throw Error("type must be of type String.");
	    	
	        for (var i=0, len=this.listeners.events_ar.length; i < len; i++){
	        	if(this.listeners.events_ar[i].target === this && this.listeners.events_ar[i].type === type){		
	    	        if(props){
	    	        	for(var prop in props){
	    	        		this.listeners.events_ar[i][prop] = props[prop];
	    	        	}
	    	        }
	        		this.listeners.events_ar[i].listener.call(this, this.listeners.events_ar[i]);
	        	}
	        }
	    };
	    
	   this.removeListener = function(type, listener){
	    	
	    	if(type == undefined) throw Error("type is required.");
	    	if(typeof type === "object") throw Error("type must be of type String.");
	    	if(typeof listener != "function") throw Error("listener must be of type Function." + type);
	    	
	        for (var i=0, len=this.listeners.events_ar.length; i < len; i++){
	        	if(this.listeners.events_ar[i].target === this 
	        			&& this.listeners.events_ar[i].type === type
	        			&& this.listeners.events_ar[i].listener ===  listener
	        	){
	        		this.listeners.events_ar.splice(i,1);
	        		break;
	        	}
	        }  
	    };
	    
	    /* destroy */
	    this.destroy = function(){
	    	this.listeners = null;
	    	
	    	this.addListener = null;
		    this.dispatchEvent = null;
		    this.removeListener = null;
	    };
	    
	};	
	
	window.FWDEventDispatcher = FWDEventDispatcher;
}(window));