package credit;

import java.rmi.*;
import java.rmi.server.*;
import java.util.Hashtable;

public class CreditManagerImpl extends UnicastRemoteObject
implements CreditManager {
    private static transient Hashtable accounts = new Hashtable();

    /** This is the default class constructor that does nothing
        but implicitly call super(). */
    public CreditManagerImpl() throws RemoteException { }

    /** Creates a new account. Puts the customer name and the customer's
        credit card in the hashtable. */
    public CreditCard newCreditAccount(String customerName)
    throws RemoteException {
        CreditCardImpl newCard = null;
        try {
            newCard = new CreditCardImpl(customerName);
        } catch (DuplicateAccountException e) {
            return null;
        }
        accounts.put(customerName, newCard);
        return newCard;
    }

    /** Searches the hashtable for an existing account. If no account
        for customer name, one is created and added to hashtable.
        Returns the account. */
    public CreditCard findCreditAccount(String customer)
    throws DuplicateAccountException, RemoteException {
        CreditCardImpl account = (CreditCardImpl)accounts.get(customer);
        if (account != null) {
            return account;
        }
        // Create new account. Add credit card to hashtable.
        account = new CreditCardImpl(customer);
        accounts.put(customer, account);
        return account;
    }
}