template.ats

import { Logger } from '../logger';

export class HouseTemplate {
    constructor() {
        this.logger = new Logger();
    }

    //Template method, final so subclasses can't override
    buildHouse() {
        this.buildFoundation();
        this.buildPillars();
        this.buildWalls();
        this.buildWindows();
        this.logger.log("House is built.");
        this.logger.log("***************");

    }

    //Always same for all kinds of concrete classes so it is implemented in base.
    buildFoundation() {
        this.logger.log("Building foundation with cement,iron rods and sand");
    }

    //Always same for all kinds of concrete classes so it is implemented in base.
    buildWindows() {
        this.logger.log("Building glass windows");
    }

    //Abstract method which is to be implemented in concrete classes
    buildPillars() {
        throw new Error("Abstract Method!");
    }

    //Abstract method which is to be implemented in concrete classes
    buildWalls() {
        throw new Error("Abstract Method!");
    }


}
//Concrete implementor 1/2
export class WoodenHouse extends HouseTemplate {
    buildWalls() {
        this.logger.log("Building wooden walls.");
    }

    buildPillars() {
        this.logger.log("Building pillars with wooden coating.");
    }
}
//Concrete implementor 2/2
export class GlassHouse extends HouseTemplate {
    buildWalls() {
        this.logger.log("Building glass walls.");
    }

    buildPillars() {
        this.logger.log("Building pillars with glass coating.");
    }
}