103 lines
3.2 KiB
JavaScript
103 lines
3.2 KiB
JavaScript
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/**
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* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule EventSubscriptionVendor
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* @typechecks
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*/
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'use strict';
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
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var invariant = require('fbjs/lib/invariant');
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/**
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* EventSubscriptionVendor stores a set of EventSubscriptions that are
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* subscribed to a particular event type.
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*/
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var EventSubscriptionVendor = (function () {
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function EventSubscriptionVendor() {
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_classCallCheck(this, EventSubscriptionVendor);
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this._subscriptionsForType = {};
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this._currentSubscription = null;
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}
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/**
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* Adds a subscription keyed by an event type.
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*
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* @param {string} eventType
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* @param {EventSubscription} subscription
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*/
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EventSubscriptionVendor.prototype.addSubscription = function addSubscription(eventType, subscription) {
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!(subscription.subscriber === this) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'The subscriber of the subscription is incorrectly set.') : invariant(false) : undefined;
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if (!this._subscriptionsForType[eventType]) {
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this._subscriptionsForType[eventType] = [];
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}
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var key = this._subscriptionsForType[eventType].length;
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this._subscriptionsForType[eventType].push(subscription);
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subscription.eventType = eventType;
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subscription.key = key;
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return subscription;
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};
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/**
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* Removes a bulk set of the subscriptions.
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*
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* @param {?string} eventType - Optional name of the event type whose
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* registered supscriptions to remove, if null remove all subscriptions.
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*/
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EventSubscriptionVendor.prototype.removeAllSubscriptions = function removeAllSubscriptions(eventType) {
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if (eventType === undefined) {
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this._subscriptionsForType = {};
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} else {
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delete this._subscriptionsForType[eventType];
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}
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};
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/**
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* Removes a specific subscription. Instead of calling this function, call
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* `subscription.remove()` directly.
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*
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* @param {object} subscription
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*/
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EventSubscriptionVendor.prototype.removeSubscription = function removeSubscription(subscription) {
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var eventType = subscription.eventType;
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var key = subscription.key;
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var subscriptionsForType = this._subscriptionsForType[eventType];
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if (subscriptionsForType) {
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delete subscriptionsForType[key];
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}
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};
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/**
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* Returns the array of subscriptions that are currently registered for the
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* given event type.
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*
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* Note: This array can be potentially sparse as subscriptions are deleted
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* from it when they are removed.
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*
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* TODO: This returns a nullable array. wat?
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*
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* @param {string} eventType
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* @return {?array}
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*/
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EventSubscriptionVendor.prototype.getSubscriptionsForType = function getSubscriptionsForType(eventType) {
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return this._subscriptionsForType[eventType];
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};
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return EventSubscriptionVendor;
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})();
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module.exports = EventSubscriptionVendor;
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