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reflective_provider.ts
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reflective_provider.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {reflector} from '../reflection/reflection';
import {Type} from '../type';
import {resolveForwardRef} from './forward_ref';
import {InjectionToken} from './injection_token';
import {Inject, Optional, Self, SkipSelf} from './metadata';
import {ClassProvider, ExistingProvider, FactoryProvider, Provider, TypeProvider, ValueProvider} from './provider';
import {invalidProviderError, mixingMultiProvidersWithRegularProvidersError, noAnnotationError} from './reflective_errors';
import {ReflectiveKey} from './reflective_key';
interface NormalizedProvider extends TypeProvider, ValueProvider, ClassProvider, ExistingProvider,
FactoryProvider {}
/**
* `Dependency` is used by the framework to extend DI.
* This is internal to Angular and should not be used directly.
*/
export class ReflectiveDependency {
constructor(
public key: ReflectiveKey, public optional: boolean, public visibility: Self|SkipSelf|null) {}
static fromKey(key: ReflectiveKey): ReflectiveDependency {
return new ReflectiveDependency(key, false, null);
}
}
const _EMPTY_LIST: any[] = [];
/**
* An internal resolved representation of a {@link Provider} used by the {@link Injector}.
*
* It is usually created automatically by `Injector.resolveAndCreate`.
*
* It can be created manually, as follows:
*
* ### Example ([live demo](http://plnkr.co/edit/RfEnhh8kUEI0G3qsnIeT?p%3Dpreview&p=preview))
*
* ```typescript
* var resolvedProviders = Injector.resolve([{ provide: 'message', useValue: 'Hello' }]);
* var injector = Injector.fromResolvedProviders(resolvedProviders);
*
* expect(injector.get('message')).toEqual('Hello');
* ```
*
* @experimental
*/
export interface ResolvedReflectiveProvider {
/**
* A key, usually a `Type<any>`.
*/
key: ReflectiveKey;
/**
* Factory function which can return an instance of an object represented by a key.
*/
resolvedFactories: ResolvedReflectiveFactory[];
/**
* Indicates if the provider is a multi-provider or a regular provider.
*/
multiProvider: boolean;
}
export class ResolvedReflectiveProvider_ implements ResolvedReflectiveProvider {
constructor(
public key: ReflectiveKey, public resolvedFactories: ResolvedReflectiveFactory[],
public multiProvider: boolean) {}
get resolvedFactory(): ResolvedReflectiveFactory { return this.resolvedFactories[0]; }
}
/**
* An internal resolved representation of a factory function created by resolving {@link
* Provider}.
* @experimental
*/
export class ResolvedReflectiveFactory {
constructor(
/**
* Factory function which can return an instance of an object represented by a key.
*/
public factory: Function,
/**
* Arguments (dependencies) to the `factory` function.
*/
public dependencies: ReflectiveDependency[]) {}
}
/**
* Resolve a single provider.
*/
function resolveReflectiveFactory(provider: NormalizedProvider): ResolvedReflectiveFactory {
let factoryFn: Function;
let resolvedDeps: ReflectiveDependency[];
if (provider.useClass) {
const useClass = resolveForwardRef(provider.useClass);
factoryFn = reflector.factory(useClass);
resolvedDeps = _dependenciesFor(useClass);
} else if (provider.useExisting) {
factoryFn = (aliasInstance: any) => aliasInstance;
resolvedDeps = [ReflectiveDependency.fromKey(ReflectiveKey.get(provider.useExisting))];
} else if (provider.useFactory) {
factoryFn = provider.useFactory;
resolvedDeps = constructDependencies(provider.useFactory, provider.deps);
} else {
factoryFn = () => provider.useValue;
resolvedDeps = _EMPTY_LIST;
}
return new ResolvedReflectiveFactory(factoryFn, resolvedDeps);
}
/**
* Converts the {@link Provider} into {@link ResolvedProvider}.
*
* {@link Injector} internally only uses {@link ResolvedProvider}, {@link Provider} contains
* convenience provider syntax.
*/
function resolveReflectiveProvider(provider: NormalizedProvider): ResolvedReflectiveProvider {
return new ResolvedReflectiveProvider_(
ReflectiveKey.get(provider.provide), [resolveReflectiveFactory(provider)],
provider.multi || false);
}
/**
* Resolve a list of Providers.
*/
export function resolveReflectiveProviders(providers: Provider[]): ResolvedReflectiveProvider[] {
const normalized = _normalizeProviders(providers, []);
const resolved = normalized.map(resolveReflectiveProvider);
const resolvedProviderMap = mergeResolvedReflectiveProviders(resolved, new Map());
return Array.from(resolvedProviderMap.values());
}
/**
* Merges a list of ResolvedProviders into a list where
* each key is contained exactly once and multi providers
* have been merged.
*/
export function mergeResolvedReflectiveProviders(
providers: ResolvedReflectiveProvider[],
normalizedProvidersMap: Map<number, ResolvedReflectiveProvider>):
Map<number, ResolvedReflectiveProvider> {
for (let i = 0; i < providers.length; i++) {
const provider = providers[i];
const existing = normalizedProvidersMap.get(provider.key.id);
if (existing) {
if (provider.multiProvider !== existing.multiProvider) {
throw mixingMultiProvidersWithRegularProvidersError(existing, provider);
}
if (provider.multiProvider) {
for (let j = 0; j < provider.resolvedFactories.length; j++) {
existing.resolvedFactories.push(provider.resolvedFactories[j]);
}
} else {
normalizedProvidersMap.set(provider.key.id, provider);
}
} else {
let resolvedProvider: ResolvedReflectiveProvider;
if (provider.multiProvider) {
resolvedProvider = new ResolvedReflectiveProvider_(
provider.key, provider.resolvedFactories.slice(), provider.multiProvider);
} else {
resolvedProvider = provider;
}
normalizedProvidersMap.set(provider.key.id, resolvedProvider);
}
}
return normalizedProvidersMap;
}
function _normalizeProviders(providers: Provider[], res: Provider[]): Provider[] {
providers.forEach(b => {
if (b instanceof Type) {
res.push({provide: b, useClass: b});
} else if (b && typeof b == 'object' && (b as any).provide !== undefined) {
res.push(b as NormalizedProvider);
} else if (b instanceof Array) {
_normalizeProviders(b, res);
} else {
throw invalidProviderError(b);
}
});
return res;
}
export function constructDependencies(
typeOrFunc: any, dependencies?: any[]): ReflectiveDependency[] {
if (!dependencies) {
return _dependenciesFor(typeOrFunc);
} else {
const params: any[][] = dependencies.map(t => [t]);
return dependencies.map(t => _extractToken(typeOrFunc, t, params));
}
}
function _dependenciesFor(typeOrFunc: any): ReflectiveDependency[] {
const params = reflector.parameters(typeOrFunc);
if (!params) return [];
if (params.some(p => p == null)) {
throw noAnnotationError(typeOrFunc, params);
}
return params.map(p => _extractToken(typeOrFunc, p, params));
}
function _extractToken(
typeOrFunc: any, metadata: any[] | any, params: any[][]): ReflectiveDependency {
let token: any = null;
let optional = false;
if (!Array.isArray(metadata)) {
if (metadata instanceof Inject) {
return _createDependency(metadata.token, optional, null);
} else {
return _createDependency(metadata, optional, null);
}
}
let visibility: Self|SkipSelf|null = null;
for (let i = 0; i < metadata.length; ++i) {
const paramMetadata = metadata[i];
if (paramMetadata instanceof Type) {
token = paramMetadata;
} else if (paramMetadata instanceof Inject) {
token = paramMetadata.token;
} else if (paramMetadata instanceof Optional) {
optional = true;
} else if (paramMetadata instanceof Self || paramMetadata instanceof SkipSelf) {
visibility = paramMetadata;
} else if (paramMetadata instanceof InjectionToken) {
token = paramMetadata;
}
}
token = resolveForwardRef(token);
if (token != null) {
return _createDependency(token, optional, visibility);
} else {
throw noAnnotationError(typeOrFunc, params);
}
}
function _createDependency(
token: any, optional: boolean, visibility: Self | SkipSelf | null): ReflectiveDependency {
return new ReflectiveDependency(ReflectiveKey.get(token), optional, visibility);
}