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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
/**
* Created by obarda on 7/4/2016.
*/
'use strict';
import * as _ from "lodash";
import {Dictionary} from "../utils/dictionary/dictionary";
interface IEventListenerService {
}
interface ICallbackData {
callback:Function;
args:any[];
}
export class EventListenerService implements IEventListenerService {
public observerCallbacks:Dictionary<string, ICallbackData[]> = new Dictionary<string, Array<ICallbackData>>();
//register an observer + callback
public registerObserverCallback = (eventName:string, callback:Function, ...args) => {
let callbackData = {
callback: callback,
args: args
}
if (this.observerCallbacks.containsKey(eventName)) {
let callbacks = this.observerCallbacks.getValue(eventName);
// Only insert the callback if the callback is different from existing callbacks.
for (let i = 0; i < callbacks.length; i++) {
if (callbacks[i].callback.toString() === callback.toString()) {
return; // Do not add this callback.
}
}
callbacks.push(callbackData);
this.observerCallbacks.setValue(eventName, callbacks);
} else {
this.observerCallbacks.setValue(eventName, [callbackData]);
}
};
//unregister an observer
public unRegisterObserver = (eventName:string, callbackFunc?:Function) => {
if (this.observerCallbacks.containsKey(eventName)) {
let callbacks: ICallbackData[] = this.observerCallbacks.getValue(eventName);
if(callbacks.length === 1) {
this.observerCallbacks.remove(eventName);
} else {
let filterCallbacks = _.filter(callbacks, (callBackObj) => {
return callBackObj.callback != callbackFunc;
});
this.observerCallbacks.setValue(eventName, filterCallbacks);
}
}
};
public notifyObservers = function (eventName:string, ...args) {
_.forEach(this.observerCallbacks.getValue(eventName), (callbackData:ICallbackData) => {
callbackData.callback(...args);
});
};
}
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