f06398cd89
* docs(toh-6/dart): first edition of prose and example code NOTE: this PR depends on #1686. Dart prose and example match TS except that: - No child-to-parent event emission occurs. - Support for Add Hero is added as an unconditional feature of the Heroes view. - http `_post` takes only a name - http `delete` takes only a hero id. - The Dart in-memory-data-service has been dropped in favor of an implementation based on the "standard" `http.testing.MockClient` class. * post-review changes
92 lines
2.2 KiB
Dart
92 lines
2.2 KiB
Dart
// #docregion
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import 'dart:async';
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import 'dart:convert';
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import 'package:angular2/core.dart';
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import 'package:http/http.dart';
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import 'hero.dart';
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@Injectable()
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class HeroService {
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// #docregion post
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static final _headers = {'Content-Type': 'application/json'};
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// #enddocregion post
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// #docregion getHeroes
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static const _heroesUrl = 'app/heroes'; // URL to web API
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final Client _http;
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HeroService(this._http);
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Future<List<Hero>> getHeroes() async {
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try {
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final response = await _http.get(_heroesUrl);
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final heroes = _extractData(response)
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.map((value) => new Hero.fromJson(value))
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.toList();
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return heroes;
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// #docregion catch
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} catch (e) {
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throw _handleError(e);
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}
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// #enddocregion catch
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}
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// #docregion extract-data
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dynamic _extractData(Response resp) => JSON.decode(resp.body)['data'];
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// #enddocregion extract-data, getHeroes
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Future<Hero> getHero(int id) async =>
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(await getHeroes()).firstWhere((hero) => hero.id == id);
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// #docregion save
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Future<Hero> save(dynamic heroOrName) =>
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heroOrName is Hero ? _put(heroOrName) : _post(heroOrName);
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// #enddocregion save
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// #docregion handleError
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Exception _handleError(dynamic e) {
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print(e); // for demo purposes only
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return new Exception('Server error; cause: $e');
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}
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// #enddocregion handleError
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// #docregion post
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Future<Hero> _post(String name) async {
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try {
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final response = await _http.post(_heroesUrl,
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headers: _headers, body: JSON.encode({'name': name}));
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return new Hero.fromJson(_extractData(response));
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} catch (e) {
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throw _handleError(e);
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}
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}
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// #enddocregion post
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// #docregion put
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Future<Hero> _put(Hero hero) async {
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try {
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var url = '$_heroesUrl/${hero.id}';
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final response =
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await _http.put(url, headers: _headers, body: JSON.encode(hero));
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return new Hero.fromJson(_extractData(response));
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} catch (e) {
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throw _handleError(e);
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}
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}
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// #enddocregion put
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// #docregion delete
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Future<Null> delete(int id) async {
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try {
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var url = '$_heroesUrl/$id';
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await _http.delete(url, headers: _headers);
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} catch (e) {
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throw _handleError(e);
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}
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}
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// #enddocregion delete
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}
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