factorymethod.ats

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

//Defined Interface
export class Shape{
    constructor(){
        this.logger = new Logger();
    }

    draw(){
        throw new Error("Interface!");
    }
}
//Concrete implementor 1/3
export class Square extends Shape {
    draw() {
        this.logger.log("Square is created!");
    }
}
//Concrete implementor 2/3}
export class Rectangle extends Shape{
    draw(){
        this.logger.log("Rectangle is created!");
    }
}
//Concrete implementor 3/3
export class Circle extends Shape{
    draw(){
        this.logger.log("Circle is created!")
    }
}
export class ShapeFactory{
//use getShape method to get object of type shape
    getShape(shapeType:string):Shape{
        if(shapeType == null)
            return null;
        else if(shapeType === 'CIRCLE')
            return new Circle();
        else if(shapeType === 'RECTANGLE')
            return new Rectangle();
        else if(shapeType === 'SQUARE')
            return new Square();
        else
            return null;
    }
}