/*
	Copyright (c) 2004-2005, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.require("dojo.event");
dojo.provide("dojo.event.topic");

dojo.event.topic = new function(){
	this.topics = {};

	this.getTopic = function(topicName){
		if(!this.topics[topicName]){
			this.topics[topicName] = new this.TopicImpl(topicName);
		}
		return this.topics[topicName];
	}

	this.registerPublisher = function(topic, obj, funcName){
		var topic = this.getTopic(topic);
		topic.registerPublisher(obj, funcName);
	}

	this.subscribe = function(topic, obj, funcName){
		var topic = this.getTopic(topic);
		topic.subscribe(obj, funcName);
	}

	this.unsubscribe = function(topic, obj, funcName){
		var topic = this.getTopic(topic);
		topic.unsubscribe(obj, funcName);
	}

	this.publish = function(topic, message){
		var topic = this.getTopic(topic);
		// if message is an array, we treat it as a set of arguments,
		// otherwise, we just pass on the arguments passed in as-is
		var args = [];
		if((arguments.length == 2)&&(message.length)&&(typeof message != "string")){
			args = message;
		}else{
			var args = [];
			for(var x=1; x<arguments.length; x++){
				args.push(arguments[x]);
			}
		}
		topic.sendMessage.apply(topic, args);
	}
}

dojo.event.topic.TopicImpl = function(topicName){
	this.topicName = topicName;
	var self = this;

	self.subscribe = function(listenerObject, listenerMethod){
		dojo.event.connect("before", self, "sendMessage", listenerObject, listenerMethod);
	}

	self.unsubscribe = function(listenerObject, listenerMethod){
		dojo.event.disconnect("before", self, "sendMessage", listenerObject, listenerMethod);
	}

	self.registerPublisher = function(publisherObject, publisherMethod){
		dojo.event.connect(publisherObject, publisherMethod, self, "sendMessage");
	}

	self.sendMessage = function(message){
		// The message has been propagated
	}
}