52 lines
1.5 KiB
Dart
52 lines
1.5 KiB
Dart
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import 'exception.dart';
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import 'reflector.dart';
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class Container {
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final Reflector reflector;
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final Map<Type, dynamic> _singletons = {};
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Container(this.reflector);
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T make<T>(Type type) {
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if (_singletons.containsKey(type)) {
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return _singletons[type] as T;
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} else {
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var reflectedType = reflector.reflectType(type);
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var positional = [];
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var named = <String, dynamic>{};
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if (reflectedType is ReflectedClass) {
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var constructor = reflectedType.constructors.firstWhere(
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(c) => c.name.isEmpty,
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orElse: () => throw new ReflectionException('${reflectedType
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.name} has no default constructor, and therefore cannot be instantiated.'));
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for (var param in constructor.parameters) {
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var value = make(param.type);
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if (param.isNamed) {
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named[param.name] = value;
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} else {
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positional.add(value);
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}
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}
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return reflectedType
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.newInstance(constructor.name, positional, named, []);
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} else {
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throw new ReflectionException(
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'$type is not a class, and therefore cannot be instantiated.');
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}
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}
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}
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void singleton(Object object, {Type as}) {
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if (_singletons.containsKey(as ?? object.runtimeType)) {
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throw new StateError('This container already has a singleton for ${as ??
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object.runtimeType}.');
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}
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_singletons[as ?? object.runtimeType] = object;
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}
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}
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