Subscription.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var isArray_1 = require("./util/isArray");
var isObject_1 = require("./util/isObject");
var isFunction_1 = require("./util/isFunction");
var UnsubscriptionError_1 = require("./util/UnsubscriptionError");
var Subscription = (function () {
    function Subscription(unsubscribe) {
        this.closed = false;
        this._parentOrParents = null;
        this._subscriptions = null;
        if (unsubscribe) {
            this._unsubscribe = unsubscribe;
        }
    }
    Subscription.prototype.unsubscribe = function () {
        var errors;
        if (this.closed) {
            return;
        }
        var _a = this, _parentOrParents = _a._parentOrParents, _unsubscribe = _a._unsubscribe, _subscriptions = _a._subscriptions;
        this.closed = true;
        this._parentOrParents = null;
        this._subscriptions = null;
        if (_parentOrParents instanceof Subscription) {
            _parentOrParents.remove(this);
        }
        else if (_parentOrParents !== null) {
            for (var index = 0; index < _parentOrParents.length; ++index) {
                var parent_1 = _parentOrParents[index];
                parent_1.remove(this);
            }
        }
        if (isFunction_1.isFunction(_unsubscribe)) {
            try {
                _unsubscribe.call(this);
            }
            catch (e) {
                errors = e instanceof UnsubscriptionError_1.UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];
            }
        }
        if (isArray_1.isArray(_subscriptions)) {
            var index = -1;
            var len = _subscriptions.length;
            while (++index < len) {
                var sub = _subscriptions[index];
                if (isObject_1.isObject(sub)) {
                    try {
                        sub.unsubscribe();
                    }
                    catch (e) {
                        errors = errors || [];
                        if (e instanceof UnsubscriptionError_1.UnsubscriptionError) {
                            errors = errors.concat(flattenUnsubscriptionErrors(e.errors));
                        }
                        else {
                            errors.push(e);
                        }
                    }
                }
            }
        }
        if (errors) {
            throw new UnsubscriptionError_1.UnsubscriptionError(errors);
        }
    };
    Subscription.prototype.add = function (teardown) {
        var 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)) {
                    var tmp = subscription;
                    subscription = new Subscription();
                    subscription._subscriptions = [tmp];
                }
                break;
            default: {
                throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');
            }
        }
        var _parentOrParents = subscription._parentOrParents;
        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;
        }
        var subscriptions = this._subscriptions;
        if (subscriptions === null) {
            this._subscriptions = [subscription];
        }
        else {
            subscriptions.push(subscription);
        }
        return subscription;
    };
    Subscription.prototype.remove = function (subscription) {
        var subscriptions = this._subscriptions;
        if (subscriptions) {
            var subscriptionIndex = subscriptions.indexOf(subscription);
            if (subscriptionIndex !== -1) {
                subscriptions.splice(subscriptionIndex, 1);
            }
        }
    };
    Subscription.EMPTY = (function (empty) {
        empty.closed = true;
        return empty;
    }(new Subscription()));
    return Subscription;
}());
exports.Subscription = Subscription;
function flattenUnsubscriptionErrors(errors) {
    return errors.reduce(function (errs, err) { return errs.concat((err instanceof UnsubscriptionError_1.UnsubscriptionError) ? err.errors : err); }, []);
}
//# sourceMappingURL=Subscription.js.map