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| 1 library di.dynamic_injector; | 1 library di.dynamic_injector; |
| 2 | 2 |
| 3 import 'di.dart'; | 3 import 'di.dart'; |
| 4 import 'src/mirrors.dart'; | 4 import 'mirrors.dart'; |
| 5 import 'src/base_injector.dart'; | |
| 6 import 'src/error_helper.dart'; | |
| 7 import 'src/provider.dart'; | |
| 8 | |
| 9 export 'di.dart'; | |
| 10 | 5 |
| 11 /** | 6 /** |
| 12 * Dynamic implementation of [Injector] that uses mirrors. | 7 * Dynamic implementation of [Injector] that uses mirrors. |
| 13 */ | 8 */ |
| 14 class DynamicInjector extends BaseInjector { | 9 class DynamicInjector extends Injector { |
| 15 | 10 |
| 16 DynamicInjector({List<Module> modules, String name, | 11 DynamicInjector({List<Module> modules, String name, |
| 17 bool allowImplicitInjection: false}) | 12 bool allowImplicitInjection: false}) |
| 18 : super(modules: modules, name: name, | 13 : super(modules: modules, name: name, |
| 19 allowImplicitInjection: allowImplicitInjection); | 14 allowImplicitInjection: allowImplicitInjection); |
| 20 | 15 |
| 21 DynamicInjector._fromParent(List<Module> modules, Injector parent, {name}) | 16 DynamicInjector._fromParent(List<Module> modules, Injector parent, {name}) |
| 22 : super.fromParent(modules, parent, name: name); | 17 : super.fromParent(modules, parent, name: name); |
| 23 | 18 |
| 24 newFromParent(List<Module> modules, String name) => | 19 newFromParent(List<Module> modules, String name) { |
| 25 new DynamicInjector._fromParent(modules, this, name: name); | 20 return new DynamicInjector._fromParent(modules, this, name: name); |
| 21 } |
| 26 | 22 |
| 27 Object newInstanceOf(Type type, ObjectFactory objFactory, Injector requestor, | 23 Object newInstanceOf(Type type, ObjectFactory getInstanceByType, |
| 28 resolving) { | 24 Injector requestor, error) { |
| 29 var classMirror = reflectType(type); | 25 var classMirror = reflectType(type); |
| 30 if (classMirror is TypedefMirror) { | 26 if (classMirror is TypedefMirror) { |
| 31 throw new NoProviderError(error(resolving, 'No implementation provided ' | 27 throw new NoProviderError(error('No implementation provided ' |
| 32 'for ${getSymbolName(classMirror.qualifiedName)} typedef!')); | 28 'for ${getSymbolName(classMirror.qualifiedName)} typedef!')); |
| 33 } | 29 } |
| 34 | 30 |
| 35 MethodMirror ctor = classMirror.declarations[classMirror.simpleName]; | 31 MethodMirror ctor = classMirror.declarations[classMirror.simpleName]; |
| 36 | 32 |
| 37 if (ctor == null) { | 33 if (ctor == null) { |
| 38 throw new NoProviderError('Unable to find default constructor for $type. ' | 34 throw new NoProviderError('Unable to find default constructor for $type. ' |
| 39 'Make sure class has a default constructor.' + (1.0 is int ? | 35 'Make sure class has a default constructor.' + |
| 40 'Make sure you have correctly configured @MirrorsUsed.' : '')); | 36 (1.0 is int ? |
| 37 ' Make sure you have correctly configured @MirrorsUsed.' : '')); |
| 41 } | 38 } |
| 42 | 39 |
| 43 resolveArgument(int pos) { | 40 resolveArgument(int pos) { |
| 44 ParameterMirror p = ctor.parameters[pos]; | 41 ParameterMirror p = ctor.parameters[pos]; |
| 45 if (p.type.qualifiedName == #dynamic) { | 42 if (MirrorSystem.getName(p.type.qualifiedName) == 'dynamic') { |
| 46 var name = MirrorSystem.getName(p.simpleName); | 43 var name = MirrorSystem.getName(p.simpleName); |
| 47 throw new NoProviderError( | 44 throw new NoProviderError(error("The '$name' parameter must be typed")); |
| 48 error(resolving, "The '$name' parameter must be typed")); | |
| 49 } | 45 } |
| 50 if (p.type is TypedefMirror) { | 46 if (p.type is TypedefMirror) { |
| 51 throw new NoProviderError( | 47 throw new NoProviderError( |
| 52 error(resolving, | 48 error('Cannot create new instance of a typedef ${p.type}')); |
| 53 'Cannot create new instance of a typedef ${p.type}')); | |
| 54 } | 49 } |
| 55 if (p.metadata.isNotEmpty) { | 50 return getInstanceByType(getReflectedTypeWorkaround(p.type), requestor); |
| 56 assert(p.metadata.length == 1); | |
| 57 var type = p.metadata.first.type.reflectedType; | |
| 58 return objFactory.getInstanceByKey( | |
| 59 new Key((p.type as ClassMirror).reflectedType, type), | |
| 60 requestor, resolving); | |
| 61 } else { | |
| 62 return objFactory.getInstanceByKey( | |
| 63 new Key((p.type as ClassMirror).reflectedType), | |
| 64 requestor, resolving); | |
| 65 } | |
| 66 } | 51 } |
| 67 | 52 |
| 68 var args = new List.generate(ctor.parameters.length, resolveArgument, | 53 var args = new List.generate(ctor.parameters.length, resolveArgument, |
| 69 growable: false); | 54 growable: false); |
| 70 return classMirror.newInstance(ctor.constructorName, args).reflectee; | 55 return classMirror.newInstance(ctor.constructorName, args).reflectee; |
| 71 } | 56 } |
| 72 | 57 |
| 73 /** | 58 /** |
| 74 * Invoke given function and inject all its arguments. | 59 * Invoke given function and inject all its arguments. |
| 75 * | 60 * |
| 76 * Returns whatever the function returns. | 61 * Returns whatever the function returns. |
| 77 */ | 62 */ |
| 78 dynamic invoke(Function fn) { | 63 dynamic invoke(Function fn) { |
| 79 ClosureMirror cm = reflect(fn); | 64 ClosureMirror cm = reflect(fn); |
| 80 MethodMirror mm = cm.function; | 65 MethodMirror mm = cm.function; |
| 81 int position = 0; | 66 int position = 0; |
| 82 List args = mm.parameters.map((ParameterMirror parameter) { | 67 List args = mm.parameters.map((ParameterMirror parameter) { |
| 83 try { | 68 try { |
| 84 if (parameter.metadata.isNotEmpty) { | 69 return get(getReflectedTypeWorkaround(parameter.type)); |
| 85 var annotation = parameter.metadata[0].type.reflectedType; | |
| 86 return get((parameter.type as ClassMirror).reflectedType, annotation); | |
| 87 } else { | |
| 88 return get((parameter.type as ClassMirror).reflectedType); | |
| 89 } | |
| 90 } on NoProviderError catch (e) { | 70 } on NoProviderError catch (e) { |
| 91 throw new NoProviderError(e.message); | 71 throw new NoProviderError(e.message); |
| 92 } finally { | 72 } finally { |
| 93 position++; | 73 position++; |
| 94 } | 74 } |
| 95 }).toList(); | 75 }).toList(); |
| 96 | 76 |
| 97 return cm.apply(args).reflectee; | 77 return cm.apply(args).reflectee; |
| 98 } | 78 } |
| 99 } | 79 } |
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