Builder Pattern Example with Pizza

Pizza.java

package com.gunhansancar.android.pizza.builder;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Günhan on 10.03.2016.
 */
public class Pizza {
    private final List<Topping> toppings;
    private final String size;
    private final String souce;

    private Pizza(Builder builder) {
        this.size = builder.size;
        this.souce = builder.souce;
        this.toppings = builder.toppings;
    }

    public String description() {
        StringBuilder sb = new StringBuilder();
        sb.append(String.format("This is a %s sized pizza with %s souce.", size, souce));
        if (toppings != null) {
            sb.append("\nIt contains;");
            for (Topping topping : toppings) {
                sb.append(String.format("\n%s", topping.description()));
            }
        }

        return sb.toString();
    }

    private static class Topping {
        private final String name;
        private boolean cooked;

        public Topping(String name) {
            this.name = name;
        }

        public void setCooked(boolean cooked) {
            this.cooked = cooked;
        }

        public String description() {
            return String.format("%s%s", cooked ? "Cooked " : "", name);
        }
    }

    public static class Builder {

        private List<Topping> toppings;
        private String size;
        private String souce;

        public Builder(String size) {
            this.size = size;
        }

        public Builder with(String name) {
            if (toppings == null) {
                toppings = new ArrayList<>();
            }
            toppings.add(new Topping(name));
            return this;
        }

        public Builder cooked() {
            if (toppings != null && toppings.size() > 0) {
                Topping topping = toppings.get(toppings.size() - 1);
                topping.setCooked(true);
            }
            return this;
        }

        public Builder souce(String souce) {
            this.souce = souce;
            return this;
        }

        public Pizza build() {
            return new Pizza(this);
        }
    }

    public static void main(String[] args) {
        Pizza pizza = new Pizza.Builder("medium")
                .souce("tomato")
                .with("Onion")
                .with("Sausage").cooked()
                .with("Mozzarella")
                .build();

        System.out.println(pizza.description());
    }
}