package ru.rpod.taop.visitor;

/**
 * @author golodnyj
 * @version 0.1
 */
public interface Visitor {
    public void visit(Apple v);
    public void visit(Bread v);
}

package ru.rpod.taop.visitor;

/**
 * @author golodnyj
 * @version 0.1
 */
public interface Visitable {
    public void accept(Visitor v);
}

package ru.rpod.taop.visitor;

/**
 * @author golodnyj
 * @version 0.1
 */
public class Apple implements Visitable{
    private int price;

    public Apple(int price) {
        this.price = price;
    }

    public void accept(Visitor v) {
        v.visit(this);
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }
}

package ru.rpod.taop.visitor;

/**
 * @author golodnyj
 * @version 0.1
 */
public class Bread implements Visitable{
    private int price;

    public Bread(int price) {
        this.price = price;
    }

    public void accept(Visitor v) {
        v.visit(this);
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }
}

package ru.rpod.taop.visitor;

/**
 * @author golodnyj
 * @version 0.1
 */
public class Calculator implements Visitor {
    private double tax;

    public void visit(Apple v) {
        System.out.println("Посчитали налоги с яблока");
        tax = tax + (0.02 * v.getPrice());
    }

    public void visit(Bread v) {
        System.out.println("Посчитали налоги с хлеба");
        tax = tax + (0.03 * v.getPrice());
    }

    public double getTax() {
        return tax;
    }
}

package ru.rpod.taop.visitor;

import java.util.*;

/**
 * @author golodnyj
 * @version 0.1
 */
public class ConsoleVisitor {
    public static void main(String[] args) {
        Collection<Visitable> c = new ArrayList<Visitable>();
        c.add(new Apple(10));
        c.add(new Apple(10));
        c.add(new Bread(10));
        c.add(new Apple(10));
        c.add(new Bread(10));
        c.add(new Bread(10));
        c.add(new Apple(10));

        Calculator calc = new Calculator();

        Iterator iterator = c.iterator();
        while (iterator.hasNext()) {
            Object o = iterator.next();
            if (o instanceof Visitable)
                ((Visitable) o).accept(calc);
        }

        System.out.println("tax = " + calc.getTax());
    }
}