angular2
Version:
Angular 2 - a web framework for modern web apps
77 lines • 7.26 kB
JavaScript
;var lang_1 = require('angular2/src/facade/lang');
var exceptions_1 = require('angular2/src/facade/exceptions');
var forward_ref_1 = require('./forward_ref');
/**
* A unique object used for retrieving items from the {@link Injector}.
*
* Keys have:
* - a system-wide unique `id`.
* - a `token`.
*
* `Key` is used internally by {@link Injector} 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 Injector} creates keys automatically when resolving
* providers.
*/
var Key = (function () {
/**
* Private
*/
function Key(token, id) {
this.token = token;
this.id = id;
if (lang_1.isBlank(token)) {
throw new exceptions_1.BaseException('Token must be defined!');
}
}
Object.defineProperty(Key.prototype, "displayName", {
/**
* Returns a stringified token.
*/
get: function () { return lang_1.stringify(this.token); },
enumerable: true,
configurable: true
});
/**
* Retrieves a `Key` for a token.
*/
Key.get = function (token) { return _globalKeyRegistry.get(forward_ref_1.resolveForwardRef(token)); };
Object.defineProperty(Key, "numberOfKeys", {
/**
* @returns the number of keys registered in the system.
*/
get: function () { return _globalKeyRegistry.numberOfKeys; },
enumerable: true,
configurable: true
});
return Key;
})();
exports.Key = Key;
/**
* @internal
*/
var KeyRegistry = (function () {
function KeyRegistry() {
this._allKeys = new Map();
}
KeyRegistry.prototype.get = function (token) {
if (token instanceof Key)
return token;
if (this._allKeys.has(token)) {
return this._allKeys.get(token);
}
var newKey = new Key(token, Key.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;
})();
exports.KeyRegistry = KeyRegistry;
var _globalKeyRegistry = new KeyRegistry();
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