class UserMonitorList { list = {}; add(userID, monitor) { if (! this.list[userID]) { this.list[userID] = {}; } this.list[userID][monitor.id] = monitor; } delete(userID, monitorID) { let monitorList = this.getMonitorList(userID); delete monitorList[monitorID]; } getMonitor(userID, monitorID) { let monitorList = this.getMonitorList(userID); if (monitorList[monitorID]) { return monitorList[monitorID]; } else { return {}; } } getMonitorList(userID) { if (this.list[userID]) { return this.list[userID]; } else { return {}; } } getAllMonitorList() { let list = {}; for (let userID in this.list) { let monitorList = this.list[userID]; for (let monitorID in monitorList) { list[monitorID] = monitorList[monitorID]; } } return list; } } module.exports = UserMonitorList;