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route_reuse_strategy.ts
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route_reuse_strategy.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 {ComponentRef, inject, Injectable} from '@angular/core';
import {OutletContext} from './router_outlet_context';
import {ActivatedRoute, ActivatedRouteSnapshot} from './router_state';
import {TreeNode} from './utils/tree';
/**
* @description
*
* Represents the detached route tree.
*
* This is an opaque value the router will give to a custom route reuse strategy
* to store and retrieve later on.
*
* @publicApi
*/
export type DetachedRouteHandle = {};
/** @internal */
export type DetachedRouteHandleInternal = {
contexts: Map<string, OutletContext>,
componentRef: ComponentRef<any>,
route: TreeNode<ActivatedRoute>,
};
/**
* @description
*
* Provides a way to customize when activated routes get reused.
*
* @publicApi
*/
@Injectable({providedIn: 'root', useFactory: () => inject(DefaultRouteReuseStrategy)})
export abstract class RouteReuseStrategy {
/** Determines if this route (and its subtree) should be detached to be reused later */
abstract shouldDetach(route: ActivatedRouteSnapshot): boolean;
/**
* Stores the detached route.
*
* Storing a `null` value should erase the previously stored value.
*/
abstract store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle|null): void;
/** Determines if this route (and its subtree) should be reattached */
abstract shouldAttach(route: ActivatedRouteSnapshot): boolean;
/** Retrieves the previously stored route */
abstract retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle|null;
/** Determines if a route should be reused */
abstract shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean;
}
/**
* @description
*
* This base route reuse strategy only reuses routes when the matched router configs are
* identical. This prevents components from being destroyed and recreated
* when just the route parameters, query parameters or fragment change
* (that is, the existing component is _reused_).
*
* This strategy does not store any routes for later reuse.
*
* Angular uses this strategy by default.
*
*
* It can be used as a base class for custom route reuse strategies, i.e. you can create your own
* class that extends the `BaseRouteReuseStrategy` one.
* @publicApi
*/
export abstract class BaseRouteReuseStrategy implements RouteReuseStrategy {
/**
* Whether the given route should detach for later reuse.
* Always returns false for `BaseRouteReuseStrategy`.
* */
shouldDetach(route: ActivatedRouteSnapshot): boolean {
return false;
}
/**
* A no-op; the route is never stored since this strategy never detaches routes for later re-use.
*/
store(route: ActivatedRouteSnapshot, detachedTree: DetachedRouteHandle): void {}
/** Returns `false`, meaning the route (and its subtree) is never reattached */
shouldAttach(route: ActivatedRouteSnapshot): boolean {
return false;
}
/** Returns `null` because this strategy does not store routes for later re-use. */
retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle|null {
return null;
}
/**
* Determines if a route should be reused.
* This strategy returns `true` when the future route config and current route config are
* identical.
*/
shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
return future.routeConfig === curr.routeConfig;
}
}
@Injectable({providedIn: 'root'})
export class DefaultRouteReuseStrategy extends BaseRouteReuseStrategy {
}