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package example.delivery;

import java.util.*;


public class CourierDatabase 
{
    private HashMap couriers = null;


    public CourierDatabase()
    {
        couriers = new HashMap();
    }


    public Courier createCourier(String name, String password)
    {
        Courier courier = new Courier(name, password);
        couriers.put(canonicalForm(name), courier);
        return courier;
    }


    public void deleteCourier(Courier courier)
    {
        couriers.remove(canonicalForm(courier.getUsername()));
    }


    public Courier getCourier(String name)
    {
        return (Courier)(couriers.get(canonicalForm(name)));
    }


    public Collection getAllCouriers()
    {
        return couriers.values();
    }


    // so that we can match names in any case
    static String canonicalForm(String name)
    {
        return name.toLowerCase();
    }
}