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form-rules.model.ts
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form-rules.model.ts
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/*!
* @license
* Copyright 2019 Alfresco Software, Ltd.
*
* Licensed 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 { InjectionToken, Injector } from '@angular/core';
import { Subject } from 'rxjs';
import { filter, takeUntil } from 'rxjs/operators';
import { FormEvent } from '../events';
import { FormRulesEvent } from '../events/form-rules.event';
import { FormModel, FormService } from '../public-api';
export const FORM_RULES_MANAGER = new InjectionToken<FormRulesManager<any>>('form.rule.manager');
export function formRulesManagerFactory<T>(injector: Injector): FormRulesManager<T> {
try {
return injector.get(FORM_RULES_MANAGER);
} catch {
return new ByPassFormRuleManager<T>(null);
}
}
export abstract class FormRulesManager<T> {
constructor(private formService: FormService) { }
protected formModel: FormModel;
private onDestroy$ = new Subject<boolean>();
private initialized = false;
initialize(formModel: FormModel) {
if (this.initialized) {
this.destroy();
this.onDestroy$ = new Subject<boolean>();
}
this.formModel = formModel;
if (!this.formModel.readOnly) {
const rules = this.getRules();
if (!!rules) {
this.formService.formRulesEvent
.pipe(
filter(event => !!event.form.id && event.form.id === formModel?.id),
takeUntil(this.onDestroy$)
).subscribe(event => {
this.handleRuleEvent(event, rules);
});
this.formService.formRulesEvent.next(new FormRulesEvent('formLoaded', new FormEvent(formModel)));
}
}
this.initialized = true;
}
protected abstract getRules(): T;
protected abstract handleRuleEvent(event: FormRulesEvent, rules: T): void;
destroy() {
this.onDestroy$.next(true);
this.onDestroy$.complete();
}
}
export class ByPassFormRuleManager<T> extends FormRulesManager<T> {
protected getRules(): T {
return null;
}
protected handleRuleEvent(): void {
return;
}
}