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Viewing file:     Subscription.js (4.68 KB)      -rw-r--r--

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