| 1 | import {Injector, ReflectiveInjector, Type} from '@angular/core';
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| 2 |
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| 3 | import {isInjectable} from '../platform/module/metadata/decorators';
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| 4 |
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| 5 | export type InjectorFunction<R> = (injector: Injector, ...args) => R;
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| 6 |
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| 7 | export const typeToInjectorFunction = <T, R>(classOrFunction: Type<T> | InjectorFunction<R>, execute: (instance: T) => R): InjectorFunction<R> => {
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| 8 | try {
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| 9 | if (isInjectable(classOrFunction as Type<T>) === false) {
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| 10 | return <InjectorFunction<R>> classOrFunction;
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| 11 | }
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| 12 | else {
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| 13 | return instantiator<T, R>(classOrFunction as Type<T>, execute);
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| 14 | }
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| 15 | }
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| 16 | catch (exception) {
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| 17 | return <InjectorFunction<R>> classOrFunction;
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| 18 | }
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| 19 | };
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| 20 |
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| 21 | const instantiator = <T, R>(type: Type<T>, execute: (instance: T) => R): (injector: Injector) => R => {
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| 22 | return (injector: Injector) => {
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| 23 | const descendantInjector = ReflectiveInjector.resolveAndCreate([type], injector);
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| 24 |
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| 25 | const reader = descendantInjector.get(type);
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| 26 |
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| 27 | return execute(reader);
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| 28 | };
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| 29 | };
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