import { isArray } from './util/isArray';
|
import { isObject } from './util/isObject';
|
import { isFunction } from './util/isFunction';
|
import { UnsubscriptionError } from './util/UnsubscriptionError';
|
export class Subscription {
|
constructor(unsubscribe) {
|
this.closed = false;
|
this._parentOrParents = null;
|
this._subscriptions = null;
|
if (unsubscribe) {
|
this._ctorUnsubscribe = true;
|
this._unsubscribe = unsubscribe;
|
}
|
}
|
unsubscribe() {
|
let errors;
|
if (this.closed) {
|
return;
|
}
|
let { _parentOrParents, _ctorUnsubscribe, _unsubscribe, _subscriptions } = this;
|
this.closed = true;
|
this._parentOrParents = null;
|
this._subscriptions = null;
|
if (_parentOrParents instanceof Subscription) {
|
_parentOrParents.remove(this);
|
}
|
else if (_parentOrParents !== null) {
|
for (let index = 0; index < _parentOrParents.length; ++index) {
|
const parent = _parentOrParents[index];
|
parent.remove(this);
|
}
|
}
|
if (isFunction(_unsubscribe)) {
|
if (_ctorUnsubscribe) {
|
this._unsubscribe = undefined;
|
}
|
try {
|
_unsubscribe.call(this);
|
}
|
catch (e) {
|
errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];
|
}
|
}
|
if (isArray(_subscriptions)) {
|
let index = -1;
|
let len = _subscriptions.length;
|
while (++index < len) {
|
const sub = _subscriptions[index];
|
if (isObject(sub)) {
|
try {
|
sub.unsubscribe();
|
}
|
catch (e) {
|
errors = errors || [];
|
if (e instanceof UnsubscriptionError) {
|
errors = errors.concat(flattenUnsubscriptionErrors(e.errors));
|
}
|
else {
|
errors.push(e);
|
}
|
}
|
}
|
}
|
}
|
if (errors) {
|
throw new UnsubscriptionError(errors);
|
}
|
}
|
add(teardown) {
|
let subscription = teardown;
|
if (!teardown) {
|
return Subscription.EMPTY;
|
}
|
switch (typeof teardown) {
|
case 'function':
|
subscription = new Subscription(teardown);
|
case 'object':
|
if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {
|
return subscription;
|
}
|
else if (this.closed) {
|
subscription.unsubscribe();
|
return subscription;
|
}
|
else if (!(subscription instanceof Subscription)) {
|
const tmp = subscription;
|
subscription = new Subscription();
|
subscription._subscriptions = [tmp];
|
}
|
break;
|
default: {
|
throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');
|
}
|
}
|
let { _parentOrParents } = subscription;
|
if (_parentOrParents === null) {
|
subscription._parentOrParents = this;
|
}
|
else if (_parentOrParents instanceof Subscription) {
|
if (_parentOrParents === this) {
|
return subscription;
|
}
|
subscription._parentOrParents = [_parentOrParents, this];
|
}
|
else if (_parentOrParents.indexOf(this) === -1) {
|
_parentOrParents.push(this);
|
}
|
else {
|
return subscription;
|
}
|
const subscriptions = this._subscriptions;
|
if (subscriptions === null) {
|
this._subscriptions = [subscription];
|
}
|
else {
|
subscriptions.push(subscription);
|
}
|
return subscription;
|
}
|
remove(subscription) {
|
const subscriptions = this._subscriptions;
|
if (subscriptions) {
|
const subscriptionIndex = subscriptions.indexOf(subscription);
|
if (subscriptionIndex !== -1) {
|
subscriptions.splice(subscriptionIndex, 1);
|
}
|
}
|
}
|
}
|
Subscription.EMPTY = (function (empty) {
|
empty.closed = true;
|
return empty;
|
}(new Subscription()));
|
function flattenUnsubscriptionErrors(errors) {
|
return errors.reduce((errs, err) => errs.concat((err instanceof UnsubscriptionError) ? err.errors : err), []);
|
}
|
//# sourceMappingURL=Subscription.js.map
|
