source: trip-planner-front/node_modules/@angular/router/esm2015/src/operators/resolve_data.js

/**
 * @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 { EMPTY, from, of } from 'rxjs';
import { concatMap, map, mergeMap, takeLast, tap } from 'rxjs/operators';
import { inheritedParamsDataResolve } from '../router_state';
import { wrapIntoObservable } from '../utils/collection';
import { getToken } from '../utils/preactivation';
export function resolveData(paramsInheritanceStrategy, moduleInjector) {
    return mergeMap(t => {
        const { targetSnapshot, guards: { canActivateChecks } } = t;
        if (!canActivateChecks.length) {
            return of(t);
        }
        let canActivateChecksResolved = 0;
        return from(canActivateChecks)
            .pipe(concatMap(check => runResolve(check.route, targetSnapshot, paramsInheritanceStrategy, moduleInjector)), tap(() => canActivateChecksResolved++), takeLast(1), mergeMap(_ => canActivateChecksResolved === canActivateChecks.length ? of(t) : EMPTY));
    });
}
function runResolve(futureARS, futureRSS, paramsInheritanceStrategy, moduleInjector) {
    const resolve = futureARS._resolve;
    return resolveNode(resolve, futureARS, futureRSS, moduleInjector)
        .pipe(map((resolvedData) => {
        futureARS._resolvedData = resolvedData;
        futureARS.data = Object.assign(Object.assign({}, futureARS.data), inheritedParamsDataResolve(futureARS, paramsInheritanceStrategy).resolve);
        return null;
    }));
}
function resolveNode(resolve, futureARS, futureRSS, moduleInjector) {
    const keys = Object.keys(resolve);
    if (keys.length === 0) {
        return of({});
    }
    const data = {};
    return from(keys).pipe(mergeMap((key) => getResolver(resolve[key], futureARS, futureRSS, moduleInjector)
        .pipe(tap((value) => {
        data[key] = value;
    }))), takeLast(1), mergeMap(() => {
        // Ensure all resolvers returned values, otherwise don't emit any "next" and just complete
        // the chain which will cancel navigation
        if (Object.keys(data).length === keys.length) {
            return of(data);
        }
        return EMPTY;
    }));
}
function getResolver(injectionToken, futureARS, futureRSS, moduleInjector) {
    const resolver = getToken(injectionToken, futureARS, moduleInjector);
    return resolver.resolve ? wrapIntoObservable(resolver.resolve(futureARS, futureRSS)) :
        wrapIntoObservable(resolver(futureARS, futureRSS));
}
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