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Viewing file:     Subscription.js (3.88 KB)      -rw-r--r--

import { isFunction } from './util/isFunction';
import { UnsubscriptionError } from './util/UnsubscriptionError';
import { arrRemove } from './util/arrRemove';
export class Subscription {
    constructor(initialTeardown) {
        this.initialTeardown = initialTeardown;
        this.closed = false;
        this._parentage = null;
        this._teardowns = null;
    }
    unsubscribe() {
        let errors;
        if (!this.closed) {
            this.closed = true;
            const { _parentage } = this;
            if (_parentage) {
                this._parentage = null;
                if (Array.isArray(_parentage)) {
                    for (const parent of _parentage) {
                        parent.remove(this);
                    }
                }
                else {
                    _parentage.remove(this);
                }
            }
            const { initialTeardown } = this;
            if (isFunction(initialTeardown)) {
                try {
                    initialTeardown();
                }
                catch (e) {
                    errors = e instanceof UnsubscriptionError ? e.errors : [e];
                }
            }
            const { _teardowns } = this;
            if (_teardowns) {
                this._teardowns = null;
                for (const teardown of _teardowns) {
                    try {
                        execTeardown(teardown);
                    }
                    catch (err) {
                        errors = errors !== null && errors !== void 0 ? errors : [];
                        if (err instanceof UnsubscriptionError) {
                            errors = [...errors, ...err.errors];
                        }
                        else {
                            errors.push(err);
                        }
                    }
                }
            }
            if (errors) {
                throw new UnsubscriptionError(errors);
            }
        }
    }
    add(teardown) {
        var _a;
        if (teardown && teardown !== this) {
            if (this.closed) {
                execTeardown(teardown);
            }
            else {
                if (teardown instanceof Subscription) {
                    if (teardown.closed || teardown._hasParent(this)) {
                        return;
                    }
                    teardown._addParent(this);
                }
                (this._teardowns = (_a = this._teardowns) !== null && _a !== void 0 ? _a : []).push(teardown);
            }
        }
    }
    _hasParent(parent) {
        const { _parentage } = this;
        return _parentage === parent || (Array.isArray(_parentage) && _parentage.includes(parent));
    }
    _addParent(parent) {
        const { _parentage } = this;
        this._parentage = Array.isArray(_parentage) ? (_parentage.push(parent), _parentage) : _parentage ? [_parentage, parent] : parent;
    }
    _removeParent(parent) {
        const { _parentage } = this;
        if (_parentage === parent) {
            this._parentage = null;
        }
        else if (Array.isArray(_parentage)) {
            arrRemove(_parentage, parent);
        }
    }
    remove(teardown) {
        const { _teardowns } = this;
        _teardowns && arrRemove(_teardowns, teardown);
        if (teardown instanceof Subscription) {
            teardown._removeParent(this);
        }
    }
}
Subscription.EMPTY = (() => {
    const empty = new Subscription();
    empty.closed = true;
    return empty;
})();
export const EMPTY_SUBSCRIPTION = Subscription.EMPTY;
export function isSubscription(value) {
    return (value instanceof Subscription ||
        (value && 'closed' in value && isFunction(value.remove) && isFunction(value.add) && isFunction(value.unsubscribe)));
}
function execTeardown(teardown) {
    if (isFunction(teardown)) {
        teardown();
    }
    else {
        teardown.unsubscribe();
    }
}
//# sourceMappingURL=Subscription.js.map