angular2
Version:
Angular 2 - a web framework for modern web apps
82 lines • 3.63 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
switch (arguments.length) {
case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);
case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);
case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);
}
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { isBlank, isPresent, CONST } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
import { ListWrapper } from 'angular2/src/facade/collection';
import { Provider, SkipSelfMetadata, OptionalMetadata, Injectable } from 'angular2/src/core/di';
/**
* A repository of different Map diffing strategies used by NgClass, NgStyle, and others.
*/
export let KeyValueDiffers = class {
constructor(factories) {
this.factories = factories;
}
static create(factories, parent) {
if (isPresent(parent)) {
var copied = ListWrapper.clone(parent.factories);
factories = factories.concat(copied);
return new KeyValueDiffers(factories);
}
else {
return new KeyValueDiffers(factories);
}
}
/**
* Takes an array of {@link KeyValueDifferFactory} and returns a provider used to extend the
* inherited {@link KeyValueDiffers} instance with the provided factories and return a new
* {@link KeyValueDiffers} instance.
*
* The following example shows how to extend an existing list of factories,
* which will only be applied to the injector for this component and its children.
* This step is all that's required to make a new {@link KeyValueDiffer} available.
*
* ### Example
*
* ```
* @Component({
* viewProviders: [
* KeyValueDiffers.extend([new ImmutableMapDiffer()])
* ]
* })
* ```
*/
static extend(factories) {
return new Provider(KeyValueDiffers, {
useFactory: (parent) => {
if (isBlank(parent)) {
// Typically would occur when calling KeyValueDiffers.extend inside of dependencies passed
// to
// bootstrap(), which would override default pipes instead of extending them.
throw new BaseException('Cannot extend KeyValueDiffers without a parent injector');
}
return KeyValueDiffers.create(factories, parent);
},
// Dependency technically isn't optional, but we can provide a better error message this way.
deps: [[KeyValueDiffers, new SkipSelfMetadata(), new OptionalMetadata()]]
});
}
find(kv) {
var factory = this.factories.find(f => f.supports(kv));
if (isPresent(factory)) {
return factory;
}
else {
throw new BaseException(`Cannot find a differ supporting object '${kv}'`);
}
}
};
KeyValueDiffers = __decorate([
Injectable(),
CONST(),
__metadata('design:paramtypes', [Array])
], KeyValueDiffers);
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