108 lines
3 KiB
Dart
108 lines
3 KiB
Dart
import 'dart:async';
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import 'angel_http_exception.dart';
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import 'service.dart';
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/// A basic service that manages an in-memory list of maps.
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class MapService extends Service {
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/// If set to `true`, clients can remove all items by passing a `null` `id` to `remove`.
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///
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/// `false` by default.
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final bool allowRemoveAll;
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/// If set to `true`, parameters in `req.query` are applied to the database query.
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final bool allowQuery;
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final List<Map<String, dynamic>> items = [];
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MapService({this.allowRemoveAll: false, this.allowQuery: true}) : super();
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_matchesId(id) {
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return (Map item) => item['id'] != null && item['id'] == id?.toString();
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}
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@override
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Future<List> index([Map params]) async {
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if (allowRemoveAll != true || params == null || params['query'] is! Map)
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return items;
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else {
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Map query = params['query'];
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return items.where((item) {
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for (var key in query.keys) {
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if (!item.containsKey(key))
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return false;
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else if (item[key] != query[key]) return false;
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}
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return true;
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}).toList();
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}
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}
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@override
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Future<Map> read(id, [Map params]) async {
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return items.firstWhere(_matchesId(id),
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orElse: () => throw new AngelHttpException.notFound(
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message: 'No record found for ID $id'));
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}
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@override
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Future<Map> create(data, [Map params]) async {
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if (data is! Map)
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throw new AngelHttpException.badRequest(
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message:
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'MapService does not support `create` with ${data.runtimeType}.');
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var result = data
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..['id'] = items.length.toString()
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..['createdAt'] = new DateTime.now();
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items.add(result);
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return result;
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}
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@override
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Future<Map> modify(id, data, [Map params]) async {
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if (data is! Map)
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throw new AngelHttpException.badRequest(
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message:
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'MapService does not support `create` with ${data.runtimeType}.');
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var item = await read(id);
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return item
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..addAll(data)
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..['updatedAt'] = new DateTime.now();
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}
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@override
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Future<Map> update(id, data, [Map params]) async {
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if (data is! Map)
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throw new AngelHttpException.badRequest(
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message:
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'MapService does not support `create` with ${data.runtimeType}.');
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if (!items.any(_matchesId(id)))
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throw new AngelHttpException.notFound(
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message: 'No record found for ID $id');
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var old = await read(id);
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if (!items.remove(old))
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throw new AngelHttpException.notFound(
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message: 'No record found for ID $id');
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var result = data
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..['id'] = id?.toString()
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..['createdAt'] = old['createdAt']
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..['updatedAt'] = new DateTime.now();
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items.add(result);
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return result;
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}
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@override
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Future<Map> remove(id, [Map params]) async {
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var result = await read(id, params);
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if (items.remove(result))
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return result;
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else
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throw new AngelHttpException.notFound(
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message: 'No record found for ID $id');
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}
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}
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