injection-js
Version:
Dependency Injection library for JavaScript and TypeScript
86 lines • 2.56 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { stringify } from './facade/lang';
import { resolveForwardRef } from './forward_ref';
/**
* A unique object used for retrieving items from the {@link ReflectiveInjector}.
*
* Keys have:
* - a system-wide unique `id`.
* - a `token`.
*
* `Key` is used internally by {@link ReflectiveInjector} because its system-wide unique `id` allows
* the
* injector to store created objects in a more efficient way.
*
* `Key` should not be created directly. {@link ReflectiveInjector} creates keys automatically when
* resolving
* providers.
* @experimental
*/
export var ReflectiveKey = (function () {
/**
* Private
*/
function ReflectiveKey(token, id) {
this.token = token;
this.id = id;
if (!token) {
throw new Error('Token must be defined!');
}
}
Object.defineProperty(ReflectiveKey.prototype, "displayName", {
/**
* Returns a stringified token.
*/
get: function () { return stringify(this.token); },
enumerable: true,
configurable: true
});
/**
* Retrieves a `Key` for a token.
*/
ReflectiveKey.get = function (token) {
return _globalKeyRegistry.get(resolveForwardRef(token));
};
Object.defineProperty(ReflectiveKey, "numberOfKeys", {
/**
* @returns the number of keys registered in the system.
*/
get: function () { return _globalKeyRegistry.numberOfKeys; },
enumerable: true,
configurable: true
});
return ReflectiveKey;
}());
/**
* @internal
*/
export var KeyRegistry = (function () {
function KeyRegistry() {
this._allKeys = new Map();
}
KeyRegistry.prototype.get = function (token) {
if (token instanceof ReflectiveKey)
return token;
if (this._allKeys.has(token)) {
return this._allKeys.get(token);
}
var newKey = new ReflectiveKey(token, ReflectiveKey.numberOfKeys);
this._allKeys.set(token, newKey);
return newKey;
};
Object.defineProperty(KeyRegistry.prototype, "numberOfKeys", {
get: function () { return this._allKeys.size; },
enumerable: true,
configurable: true
});
return KeyRegistry;
}());
var _globalKeyRegistry = new KeyRegistry();
//# sourceMappingURL=reflective_key.js.map