visitor.ats

import { Logger } from '../logger';
import { int, float } from '../lang';


export class ComputerPart {
    accept(computerPartVisitor:ComputerPartVisitor) {
        throw new Error("Abstract Method!");
    }
}

export class Keyboard extends ComputerPart {
    accept(computerPartVisitor:ComputerPartVisitor) {
        computerPartVisitor.visitKeyboard(this);
    }
}

export class Monitor extends ComputerPart {
    accept(computerPartVisitor:ComputerPartVisitor) {
        computerPartVisitor.visitMonitor(this);
    }
}

export class Mouse extends ComputerPart {
    accept(computerPartVisitor:ComputerPartVisitor) {
        computerPartVisitor.visitMouse(this);
    }
}


export class Computer extends ComputerPart {
    constructor() {
        this.parts = [new Mouse, new Keyboard(), new Monitor()];
    }

    accept(computerPartVisitor:ComputerPartVisitor) {
        this.parts.forEach(part=> {
            part.accept(computerPartVisitor);
        });
        computerPartVisitor.visitComputer(this);
    }
}

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

    visitComputer(computer:Computer) {
        throw new Error("Abstract Method!");
    }

    visitMouse(mouse:Mouse) {
        throw new Error("Abstract Method!");
    }

    visitKeyboard(keyboard:Keyboard) {
        throw new Error("Abstract Method!");
    }

    visitMonitor(monitor:Monitor) {
        throw new Error("Abstract Method!");
    }
}

export class ComputerPartDisplayVisitor extends ComputerPartVisitor {
    visitComputer(computer:Computer) {
        this.logger.log("Displaying Computer.");
    }

    visitMouse(mouse:Mouse) {
        this.logger.log("Displaying Mouse.");
    }

    visitKeyboard(keyboard:Keyboard) {
        this.logger.log("Displaying Keyboard.");
    }

    visitMonitor(monitor:Monitor) {
        this.logger.log("Displaying Monitor.");
    }
}