Coding dojo cara : SRP

gistfile1.java

package cara;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Cart implements Serializable {

	private static final long serialVersionUID = 1L;

	private List<Product> products = new ArrayList<Product>();
	
	private Client client;
	
	private boolean hasPaid = false;

	private final Date creationDate;
	
	public Cart(Client client, Date creationDate) {
		this.client = client;
		this.creationDate = creationDate;
	}

	public void addProduct(Product prod) {
		products.add(prod);
	}
	
	public void removeProduct(Product prod) {
		products.remove(prod);
	}

	public List<Product> getProducts() {
		return products;
	}
	
	public List<String> getProductsNames() {
		List<String> names = new ArrayList<String>();
		for (Product product : products) {
			names.add(product.getName());
		}
		return names;
	}
	
	public float totalPrice() {
		int total = 0;
		for (Product product : products) {
			total += product.getPrice();
		}
		return total;
	}
	
	public boolean validate() {
		boolean ok = true;
		if (client.isSolvent()) {
			client.pay(totalPrice());
			hasPaid = true;
		}
		else {
			ok = false;
		}
		return ok;
	}
	
	public void save() throws IOException {
		ObjectOutputStream stream = new ObjectOutputStream(new FileOutputStream("cart.ser"));
		stream.writeObject(this);
	}
	
	public String computeMailContent() {
		 String content = "Bonjour,\nVotre panier composé le " + creationDate
		   + " comporte les éléments suivants :\n";
		 for (Product product : products) {
		  content += "- " + product.getName() + " au prix de "
		    + product.getPrice() + "\n";
		 }
		 return content;
		}
}

public interface Client {

	boolean isSolvent();

	void pay(float totalPrice);

}

public interface Product {

	float getPrice();

	String getName();

}

public class Status {

}