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 { MessageService } from '../../services/message.service';

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

export class EntityValidator< T > {
    constructor( private messageService: MessageService,
                 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;
    }

}