Update all Angular libs (run update_all.sh).

third_party/pkg/di/lib/injector.dart

-part of di;
-
-class Injector {
-
-  /**
-   * Name of the injector or null of none is given.
-   */
-  final String name;
-
-  static const List<Type> _PRIMITIVE_TYPES = const <Type>[
-    num, int, double, String, bool
-  ];
-
-  /**
-   * Returns the parent injector or null if root.
-   */
-  final Injector parent;
-
-  Injector _root;
-
-  Map<Type, _Provider> _providers = <Type, _Provider>{};
-
-  final Map<Type, Object> instances = <Type, Object>{};
-
-  final List<Type> resolving = <Type>[];
-
-  final bool allowImplicitInjection;
-
-  Iterable<Type> _typesCache;
-
-  /**
-   * List of all types which the injector can return
-   */
-  Iterable<Type> get _types {
-    if (_typesCache == null) {
-      _typesCache = _providers.keys;
-    }
-    return _typesCache;
-  }
-
-  Injector({List<Module> modules, String name,
-           bool allowImplicitInjection: false})
-      : this.fromParent(modules, null,
-          name: name, allowImplicitInjection: allowImplicitInjection);
-
-  Injector.fromParent(List<Module> modules,
-      Injector this.parent, {this.name, this.allowImplicitInjection}) {
-    _root = parent == null ? this : parent._root;
-    if (modules != null) {
-      modules.forEach((module) {
-        _providers.addAll(module._bindings);
-      });
-    }
-    _providers[Injector] = new _ValueProvider(this);
-  }
-
-  Injector get root => _root;
-
-  Set<Type> get types {
-    var types = new Set.from(_types);
-    var parent = this.parent;
-    while (parent != null) {
-      types.addAll(parent._types);
-      parent = parent.parent;
-    }
-    return types;
-  }
-
-  String _error(message, [appendDependency]) {
-    if (appendDependency != null) {
-      resolving.add(appendDependency);
-    }
-
-    String graph = resolving.join(' -> ');
-
-    resolving.clear();
-
-    return '$message (resolving $graph)';
-  }
-
-  dynamic _getInstanceByType(Type typeName, Injector requester) {
-    _checkTypeConditions(typeName);
-
-    if (resolving.contains(typeName)) {
-      throw new CircularDependencyError(
-          _error('Cannot resolve a circular dependency!', typeName));
-    }
-
-    var providerWithInjector = _getProviderWithInjectorForType(typeName);
-    var provider = providerWithInjector.provider;
-    var injector = providerWithInjector.injector;
-    var visible = provider.visibility != null ?
-        provider.visibility(requester, injector) :
-        _defaultVisibility(requester, injector);
-
-    if (visible && instances.containsKey(typeName)) {
-      return instances[typeName];
-    }
-
-    if (providerWithInjector.injector != this || !visible) {
-      if (!visible) {
-        if (injector.parent == null) {
-          throw new NoProviderError(
-              _error('No provider found for ${typeName}!', typeName));
-        }
-        injector =
-            injector.parent._getProviderWithInjectorForType(typeName).injector;
-      }
-      return injector._getInstanceByType(typeName, requester);
-    }
-
-    var value;
-    try {
-      var strategy = provider.creationStrategy != null ?
-          provider.creationStrategy : _defaultCreationStrategy;
-      value = strategy(requester, injector, () {
-        resolving.add(typeName);
-        var val = provider.get(this, requester, _getInstanceByType, _error);
-        resolving.removeLast();
-        return val;
-      });
-    } catch(e) {
-      resolving.clear();
-      rethrow;
-    }
-
-    // cache the value.
-    providerWithInjector.injector.instances[typeName] = value;
-    return value;
-  }
-
-  /// Returns a pair for provider and the injector where it's defined.
-  _ProviderWithDefiningInjector _getProviderWithInjectorForType(Type typeName) {
-    if (_providers.containsKey(typeName)) {
-      return new _ProviderWithDefiningInjector(_providers[typeName], this);
-    }
-
-    if (parent != null) {
-      return parent._getProviderWithInjectorForType(typeName);
-    }
-
-    if (allowImplicitInjection) {
-      return new _ProviderWithDefiningInjector(
-          new _TypeProvider(typeName), this);
-    }
-
-    throw new NoProviderError(_error('No provider found for '
-        '${typeName}!', typeName));
-  }
-
-  void _checkTypeConditions(Type typeName) {
-    if (_PRIMITIVE_TYPES.contains(typeName)) {
-      throw new NoProviderError(_error('Cannot inject a primitive type '
-          'of $typeName!', typeName));
-    }
-  }
-
-
-  // PUBLIC API
-
-  /**
-   * Get an instance for given token ([Type]).
-   *
-   * If the injector already has an instance for this token, it returns this
-   * instance. Otherwise, injector resolves all its dependencies, instantiate
-   * new instance and returns this instance.
-   *
-   * If there is no binding for given token, injector asks parent injector.
-   *
-   * If there is no parent injector, an implicit binding is used. That is,
-   * the token ([Type]) is instantiated.
-   */
-  dynamic get(Type type) => _getInstanceByType(type, this);
-
-  /**
-   * Create a child injector.
-   *
-   * Child injector can override any bindings by adding additional modules.
-   *
-   * It also accepts a list of tokens that a new instance should be forced.
-   * That means, even if some parent injector already has an instance for this
-   * token, there will be a new instance created in the child injector.
-   */
-  Injector createChild(List<Module> modules,
-                       {List<Type> forceNewInstances, String name}) {
-    if (forceNewInstances != null) {
-      Module forceNew = new Module();
-      forceNewInstances.forEach((type) {
-        var providerWithInjector = _getProviderWithInjectorForType(type);
-        var provider = providerWithInjector.provider;
-        forceNew.factory(type,
-            (Injector inj) => provider.get(this, inj, inj._getInstanceByType,
-                inj._error),
-            creation: provider.creationStrategy,
-            visibility: provider.visibility);
-      });
-
-      modules = modules.toList(); // clone
-      modules.add(forceNew);
-    }
-
-    return newFromParent(modules, name);
-  }
-
-  newFromParent(List<Module> modules, String name) {
-    throw new UnimplementedError('This method must be overriden.');
-  }
-
-  Object newInstanceOf(Type type, ObjectFactory factory, Injector requestor,
-                       errorHandler(message, [appendDependency])) {
-    throw new UnimplementedError('This method must be overriden.');
-  }
-}
-
-class _ProviderWithDefiningInjector {
-  final _Provider provider;
-  final Injector injector;
-  _ProviderWithDefiningInjector(this.provider, this.injector);
-}