@angular/core
Version:
Angular - the core framework
86 lines • 11 kB
JavaScript
/**
* @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 { Component, Directive, NgModule, Pipe, ɵReflectionCapabilities as ReflectionCapabilities } from '@angular/core';
import { MetadataOverrider } from './metadata_overrider';
const reflection = new ReflectionCapabilities();
/**
* Allows to override ivy metadata for tests (via the `TestBed`).
*/
class OverrideResolver {
constructor() {
this.overrides = new Map();
this.resolved = new Map();
}
addOverride(type, override) {
const overrides = this.overrides.get(type) || [];
overrides.push(override);
this.overrides.set(type, overrides);
this.resolved.delete(type);
}
setOverrides(overrides) {
this.overrides.clear();
overrides.forEach(([type, override]) => {
this.addOverride(type, override);
});
}
getAnnotation(type) {
const annotations = reflection.annotations(type);
// Try to find the nearest known Type annotation and make sure that this annotation is an
// instance of the type we are looking for, so we can use it for resolution. Note: there might
// be multiple known annotations found due to the fact that Components can extend Directives (so
// both Directive and Component annotations would be present), so we always check if the known
// annotation has the right type.
for (let i = annotations.length - 1; i >= 0; i--) {
const annotation = annotations[i];
const isKnownType = annotation instanceof Directive || annotation instanceof Component ||
annotation instanceof Pipe || annotation instanceof NgModule;
if (isKnownType) {
return annotation instanceof this.type ? annotation : null;
}
}
return null;
}
resolve(type) {
let resolved = this.resolved.get(type) || null;
if (!resolved) {
resolved = this.getAnnotation(type);
if (resolved) {
const overrides = this.overrides.get(type);
if (overrides) {
const overrider = new MetadataOverrider();
overrides.forEach(override => {
resolved = overrider.overrideMetadata(this.type, resolved, override);
});
}
}
this.resolved.set(type, resolved);
}
return resolved;
}
}
export class DirectiveResolver extends OverrideResolver {
get type() {
return Directive;
}
}
export class ComponentResolver extends OverrideResolver {
get type() {
return Component;
}
}
export class PipeResolver extends OverrideResolver {
get type() {
return Pipe;
}
}
export class NgModuleResolver extends OverrideResolver {
get type() {
return NgModule;
}
}
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