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component_factory_resolver.ts
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component_factory_resolver.ts
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/**
* @license
* Copyright Google LLC 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 {Injector} from '../di/injector';
import {Type} from '../interface/type';
import {stringify} from '../util/stringify';
import {ComponentFactory, ComponentRef} from './component_factory';
import {NgModuleRef} from './ng_module_factory';
export function noComponentFactoryError(component: Function) {
const error = Error(`No component factory found for ${
stringify(component)}. Did you add it to @NgModule.entryComponents?`);
(error as any)[ERROR_COMPONENT] = component;
return error;
}
const ERROR_COMPONENT = 'ngComponent';
export function getComponent(error: Error): Type<any> {
return (error as any)[ERROR_COMPONENT];
}
class _NullComponentFactoryResolver implements ComponentFactoryResolver {
resolveComponentFactory<T>(component: {new(...args: any[]): T}): ComponentFactory<T> {
throw noComponentFactoryError(component);
}
}
/**
* A simple registry that maps `Components` to generated `ComponentFactory` classes
* that can be used to create instances of components.
* Use to obtain the factory for a given component type,
* then use the factory's `create()` method to create a component of that type.
*
* @see [Dynamic Components](guide/dynamic-component-loader)
* @see [Usage Example](guide/dynamic-component-loader#resolving-components)
* @see <live-example name="dynamic-component-loader" noDownload></live-example>
of the code in this cookbook
* @publicApi
*/
export abstract class ComponentFactoryResolver {
static NULL: ComponentFactoryResolver = (/* @__PURE__ */ new _NullComponentFactoryResolver());
/**
* Retrieves the factory object that creates a component of the given type.
* @param component The component type.
*/
abstract resolveComponentFactory<T>(component: Type<T>): ComponentFactory<T>;
}
export class CodegenComponentFactoryResolver implements ComponentFactoryResolver {
private _factories = new Map<any, ComponentFactory<any>>();
constructor(
factories: ComponentFactory<any>[], private _parent: ComponentFactoryResolver,
private _ngModule: NgModuleRef<any>) {
for (let i = 0; i < factories.length; i++) {
const factory = factories[i];
this._factories.set(factory.componentType, factory);
}
}
resolveComponentFactory<T>(component: {new(...args: any[]): T}): ComponentFactory<T> {
let factory = this._factories.get(component);
if (!factory && this._parent) {
factory = this._parent.resolveComponentFactory(component);
}
if (!factory) {
throw noComponentFactoryError(component);
}
return new ComponentFactoryBoundToModule(factory, this._ngModule);
}
}
export class ComponentFactoryBoundToModule<C> extends ComponentFactory<C> {
override readonly selector: string;
override readonly componentType: Type<any>;
override readonly ngContentSelectors: string[];
override readonly inputs: {propName: string, templateName: string}[];
override readonly outputs: {propName: string, templateName: string}[];
constructor(private factory: ComponentFactory<C>, private ngModule: NgModuleRef<any>) {
super();
this.selector = factory.selector;
this.componentType = factory.componentType;
this.ngContentSelectors = factory.ngContentSelectors;
this.inputs = factory.inputs;
this.outputs = factory.outputs;
}
override create(
injector: Injector, projectableNodes?: any[][], rootSelectorOrNode?: string|any,
ngModule?: NgModuleRef<any>): ComponentRef<C> {
return this.factory.create(
injector, projectableNodes, rootSelectorOrNode, ngModule || this.ngModule);
}
}