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/** PURE_IMPORTS_START .._Subscriber,.._Subscription,.._Observable,.._Subject,.._util_Map,.._util_FastMap PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b)
if (b.hasOwnProperty(p))
d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { Observable } from '../Observable';
import { Subject } from '../Subject';
import { Map } from '../util/Map';
import { FastMap } from '../util/FastMap';
/* tslint:enable:max-line-length */
/**
* Groups the items emitted by an Observable according to a specified criterion,
* and emits these grouped items as `GroupedObservables`, one
* {@link GroupedObservable} per group.
*
* <img src="./img/groupBy.png" width="100%">
*
* @example <caption>Group objects by id and return as array</caption>
* Observable.of<Obj>({id: 1, name: 'aze1'},
* {id: 2, name: 'sf2'},
* {id: 2, name: 'dg2'},
* {id: 1, name: 'erg1'},
* {id: 1, name: 'df1'},
* {id: 2, name: 'sfqfb2'},
* {id: 3, name: 'qfs3'},
* {id: 2, name: 'qsgqsfg2'}
* )
* .groupBy(p => p.id)
* .flatMap( (group$) => group$.reduce((acc, cur) => [...acc, cur], []))
* .subscribe(p => console.log(p));
*
* // displays:
* // [ { id: 1, name: 'aze1' },
* // { id: 1, name: 'erg1' },
* // { id: 1, name: 'df1' } ]
* //
* // [ { id: 2, name: 'sf2' },
* // { id: 2, name: 'dg2' },
* // { id: 2, name: 'sfqfb2' },
* // { id: 2, name: 'qsgqsfg2' } ]
* //
* // [ { id: 3, name: 'qfs3' } ]
*
* @example <caption>Pivot data on the id field</caption>
* Observable.of<Obj>({id: 1, name: 'aze1'},
* {id: 2, name: 'sf2'},
* {id: 2, name: 'dg2'},
* {id: 1, name: 'erg1'},
* {id: 1, name: 'df1'},
* {id: 2, name: 'sfqfb2'},
* {id: 3, name: 'qfs1'},
* {id: 2, name: 'qsgqsfg2'}
* )
* .groupBy(p => p.id, p => p.name)
* .flatMap( (group$) => group$.reduce((acc, cur) => [...acc, cur], ["" + group$.key]))
* .map(arr => ({'id': parseInt(arr[0]), 'values': arr.slice(1)}))
* .subscribe(p => console.log(p));
*
* // displays:
* // { id: 1, values: [ 'aze1', 'erg1', 'df1' ] }
* // { id: 2, values: [ 'sf2', 'dg2', 'sfqfb2', 'qsgqsfg2' ] }
* // { id: 3, values: [ 'qfs1' ] }
*
* @param {function(value: T): K} keySelector A function that extracts the key
* for each item.
* @param {function(value: T): R} [elementSelector] A function that extracts the
* return element for each item.
* @param {function(grouped: GroupedObservable<K,R>): Observable<any>} [durationSelector]
* A function that returns an Observable to determine how long each group should
* exist.
* @return {Observable<GroupedObservable<K,R>>} An Observable that emits
* GroupedObservables, each of which corresponds to a unique key value and each
* of which emits those items from the source Observable that share that key
* value.
* @method groupBy
* @owner Observable
*/
export function groupBy(keySelector, elementSelector, durationSelector, subjectSelector) {
return function (source) {
return source.lift(new GroupByOperator(keySelector, elementSelector, durationSelector, subjectSelector));
};
}
var GroupByOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
function GroupByOperator(keySelector, elementSelector, durationSelector, subjectSelector) {
this.keySelector = keySelector;
this.elementSelector = elementSelector;
this.durationSelector = durationSelector;
this.subjectSelector = subjectSelector;
}
GroupByOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new GroupBySubscriber(subscriber, this.keySelector, this.elementSelector, this.durationSelector, this.subjectSelector));
};
return GroupByOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var GroupBySubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
__extends(GroupBySubscriber, _super);
function GroupBySubscriber(destination, keySelector, elementSelector, durationSelector, subjectSelector) {
_super.call(this, destination);
this.keySelector = keySelector;
this.elementSelector = elementSelector;
this.durationSelector = durationSelector;
this.subjectSelector = subjectSelector;
this.groups = null;
this.attemptedToUnsubscribe = false;
this.count = 0;
}
GroupBySubscriber.prototype._next = function (value) {
var key;
try {
key = this.keySelector(value);
}
catch (err) {
this.error(err);
return;
}
this._group(value, key);
};
GroupBySubscriber.prototype._group = function (value, key) {
var groups = this.groups;
if (!groups) {
groups = this.groups = typeof key === 'string' ? new FastMap() : new Map();
}
var group = groups.get(key);
var element;
if (this.elementSelector) {
try {
element = this.elementSelector(value);
}
catch (err) {
this.error(err);
}
}
else {
element = value;
}
if (!group) {
group = this.subjectSelector ? this.subjectSelector() : new Subject();
groups.set(key, group);
var groupedObservable = new GroupedObservable(key, group, this);
this.destination.next(groupedObservable);
if (this.durationSelector) {
var duration = void 0;
try {
duration = this.durationSelector(new GroupedObservable(key, group));
}
catch (err) {
this.error(err);
return;
}
this.add(duration.subscribe(new GroupDurationSubscriber(key, group, this)));
}
}
if (!group.closed) {
group.next(element);
}
};
GroupBySubscriber.prototype._error = function (err) {
var groups = this.groups;
if (groups) {
groups.forEach(function (group, key) {
group.error(err);
});
groups.clear();
}
this.destination.error(err);
};
GroupBySubscriber.prototype._complete = function () {
var groups = this.groups;
if (groups) {
groups.forEach(function (group, key) {
group.complete();
});
groups.clear();
}
this.destination.complete();
};
GroupBySubscriber.prototype.removeGroup = function (key) {
this.groups.delete(key);
};
GroupBySubscriber.prototype.unsubscribe = function () {
if (!this.closed) {
this.attemptedToUnsubscribe = true;
if (this.count === 0) {
_super.prototype.unsubscribe.call(this);
}
}
};
return GroupBySubscriber;
}(Subscriber));
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var GroupDurationSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
__extends(GroupDurationSubscriber, _super);
function GroupDurationSubscriber(key, group, parent) {
_super.call(this, group);
this.key = key;
this.group = group;
this.parent = parent;
}
GroupDurationSubscriber.prototype._next = function (value) {
this.complete();
};
/** @deprecated internal use only */ GroupDurationSubscriber.prototype._unsubscribe = function () {
var _a = this, parent = _a.parent, key = _a.key;
this.key = this.parent = null;
if (parent) {
parent.removeGroup(key);
}
};
return GroupDurationSubscriber;
}(Subscriber));
/**
* An Observable representing values belonging to the same group represented by
* a common key. The values emitted by a GroupedObservable come from the source
* Observable. The common key is available as the field `key` on a
* GroupedObservable instance.
*
* @class GroupedObservable<K, T>
*/
export var GroupedObservable = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
__extends(GroupedObservable, _super);
function GroupedObservable(key, groupSubject, refCountSubscription) {
_super.call(this);
this.key = key;
this.groupSubject = groupSubject;
this.refCountSubscription = refCountSubscription;
}
/** @deprecated internal use only */ GroupedObservable.prototype._subscribe = function (subscriber) {
var subscription = new Subscription();
var _a = this, refCountSubscription = _a.refCountSubscription, groupSubject = _a.groupSubject;
if (refCountSubscription && !refCountSubscription.closed) {
subscription.add(new InnerRefCountSubscription(refCountSubscription));
}
subscription.add(groupSubject.subscribe(subscriber));
return subscription;
};
return GroupedObservable;
}(Observable));
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var InnerRefCountSubscription = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
__extends(InnerRefCountSubscription, _super);
function InnerRefCountSubscription(parent) {
_super.call(this);
this.parent = parent;
parent.count++;
}
InnerRefCountSubscription.prototype.unsubscribe = function () {
var parent = this.parent;
if (!parent.closed && !this.closed) {
_super.prototype.unsubscribe.call(this);
parent.count -= 1;
if (parent.count === 0 && parent.attemptedToUnsubscribe) {
parent.unsubscribe();
}
}
};
return InnerRefCountSubscription;
}(Subscription));
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