userdatabase.java

J2ME MIDP_Example_Applications

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package example.fruitmachine;

import java.util.*;


public class UserDatabase 
{
    private HashMap users = new HashMap();  // map name -> user


    public UserDatabase()
    {
    }


    public User createUser(String name, String password)
    {
        User user = new User(name, password);
        users.put(canonicalForm(name), user);
        return user;
    }


    public void deleteUser(User user)
    {
        users.remove(canonicalForm(user.getName()));
    }


    public User getUser(String name)
    {
        return (User)(users.get(canonicalForm(name)));
    }


    public Collection getAllUsers()
    {
        return users.values();
    }


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