src/app/custom_modules/helpers/entity-validator.ts

/*
******************************************************************************
* Copyright © 2018 PTA GmbH.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
*
*     http://www.eclipse.org/legal/epl-v10.html
*
******************************************************************************
*/
import { ToasterMessageService } from '../../services/toaster-message.service';

export abstract class ValidationFunc<T> {
    public abstract validate(item: T, messageService: ToasterMessageService): boolean;
}

export class EntityValidator<T> {
    constructor(private messageService: ToasterMessageService,
        private validationList: ValidationFunc<T>[]) { }

    public validateEntity(entity: T, stopOnFirstError: boolean): boolean {
        let errorOccured = false;
        this.validationList.forEach(validator => {
            if (!(errorOccured && stopOnFirstError)) {
                errorOccured = !validator.validate(entity, this.messageService);
            }
        });
        return !errorOccured;
    }

}