initial checkin from subversion

observerHandling.js

@@ -0,0 +1,36 @@
+function Publisher() {
+	var m_subscribers=new Array();
+	
+	this.addSubscriber=addSubscriber;
+	this.removeSubscriber=removeSubscriber;
+	this.notifySubscribers=notifySubscribers;
+
+	function addSubscriber(subscriber,eventType){
+		for(var i=0;i<m_subscribers.length;i++){
+			if((m_subscribers[i][0]==subscriber)
+			   &&(m_subscribers[i][1]==eventType)){
+				return(false);
+			}
+		}
+		var entryDetails=new Array();
+		entryDetails[0]=subscriber;
+		entryDetails[1]=eventType;
+		m_subscribers[m_subscribers.length]=entryDetails;
+		return(true);
+	}
+	function removeSubscriber(subscriber,eventType){
+		for(var i=0;i<m_subscribers.length;i++){
+			if((m_subscribers[i][0]==subscriber)
+			  &&(m_subscribers[i][1]==eventType)){
+				m_subscribers.splice(i,1);
+			}
+		}
+	}
+	function notifySubscribers(publisher,eventType,addInfo){
+		for(var i=0;i<m_subscribers.length;i++){
+			if(m_subscribers[i][1]==eventType){
+				m_subscribers[i][0](publisher,eventType,addInfo);
+			}
+		}
+	}
+}