276 lines
10 KiB
JavaScript
276 lines
10 KiB
JavaScript
"use strict";
|
|
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 __());
|
|
};
|
|
var Subscriber_1 = require('../Subscriber');
|
|
var Subscription_1 = require('../Subscription');
|
|
var Observable_1 = require('../Observable');
|
|
var Subject_1 = require('../Subject');
|
|
var Map_1 = require('../util/Map');
|
|
var FastMap_1 = require('../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
|
|
*/
|
|
function groupBy(keySelector, elementSelector, durationSelector, subjectSelector) {
|
|
return function (source) {
|
|
return source.lift(new GroupByOperator(keySelector, elementSelector, durationSelector, subjectSelector));
|
|
};
|
|
}
|
|
exports.groupBy = groupBy;
|
|
var GroupByOperator = (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 = (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_1.FastMap() : new Map_1.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_1.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_1.Subscriber));
|
|
/**
|
|
* We need this JSDoc comment for affecting ESDoc.
|
|
* @ignore
|
|
* @extends {Ignored}
|
|
*/
|
|
var GroupDurationSubscriber = (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_1.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>
|
|
*/
|
|
var GroupedObservable = (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_1.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_1.Observable));
|
|
exports.GroupedObservable = GroupedObservable;
|
|
/**
|
|
* We need this JSDoc comment for affecting ESDoc.
|
|
* @ignore
|
|
* @extends {Ignored}
|
|
*/
|
|
var InnerRefCountSubscription = (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_1.Subscription));
|
|
//# sourceMappingURL=groupBy.js.map
|