| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| import {AbstractControl, AsyncValidatorFn, ValidationErrors} from '@angular/forms'; |
| import {Observable} from 'rxjs/Observable'; |
| import {AccountingService} from '../../services/accounting/accounting.service'; |
| import {isString} from './validators'; |
| |
| const invalid = Observable.of({ |
| invalidLedger: true |
| }); |
| |
| export function ledgerExists(accountingService: AccountingService): AsyncValidatorFn { |
| return (control: AbstractControl): Observable<ValidationErrors | null> => { |
| if (!control.dirty || !control.value || control.value.length === 0) { |
| return Observable.of(null); |
| } |
| |
| if (isString(control.value) && control.value.trim().length === 0) { |
| return invalid; |
| } |
| |
| return accountingService.findLedger(control.value, true) |
| .map(ledger => null) |
| .catch(() => invalid); |
| }; |
| } |