eventManager.js

/*
 * AsTeRICS - Assistive Technology Rapid Integration and Construction Set (http://www.asterics.org)
 * 
 * 
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 *      Y88b d88P Y88b d88P  88888888 888    888   d88P   888 888    888       "888
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 * 
 * Copyright 2015 Kompetenznetzwerk KI-I (http://ki-i.at)
 * 
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-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.
 */
 
 ACS.eventManager = function() {

// ***********************************************************************************************************************
// ************************************************** private variables **************************************************
// ***********************************************************************************************************************
	var events = [];
	
// ***********************************************************************************************************************
// ************************************************** private methods ****************************************************
// ***********************************************************************************************************************
	
// ***********************************************************************************************************************
// ************************************************** public stuff *******************************************************
// ***********************************************************************************************************************
	var returnObj = {};
	
	returnObj.registerHandler = function(eventName, handler) {
		if (events[eventName]) {
			if (events[eventName].indexOf(handler) === -1) events[eventName].push(handler);
		} else {
			events[eventName] = [handler];
		}
	}
	
	returnObj.removeHandler = function(eventName, handler) {
		if ((events[eventName]) && (events[eventName].indexOf(handler) > -1)) {
			events[eventName].splice(events[eventName].indexOf(handler), 1);
			return true;
		} else {
			return false;
		}
	}

	returnObj.fireEvent = function(eventName, args) {
		log.info('the event ' + eventName + ' has been fired and the handlers (if any) are now being called...');
		if (!events[eventName]) {
			return false;
		} else {
			for (var i = 0; i < events[eventName].length; i++) {
				events[eventName][i](args);
			}
		}
	}
	
// ***********************************************************************************************************************
// ************************************************** constructor code ***************************************************
// ***********************************************************************************************************************	
	
	return returnObj;
}