/*
 * This example is from the book "Java Enterprise in a Nutshell".
 * Copyright (c) 1999 by O'Reilly & Associates.  
 * You may distribute this source code for non-commercial purposes only.
 * You may study, modify, and use this example for any purpose, as long as
 * this notice is retained.  Note that this example is provided "as is",
 * WITHOUT WARRANTY of any kind either expressed or implied.
 */

import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;
import java.util.List;
import java.util.ListIterator;

/**
 * AccountImpl: Implementation of the Account remote interface.
 *
 * Example 3-2, Java Enterprise in a Nutshell, 1st ed.
 * Author: Jim Farley
 */

public class AccountImpl extends UnicastRemoteObject implements Account {
  // Our current balance
  private float mBalance = 0;
  // Name on account
  private String mName = "";
  // Create a new account with the given name
  public AccountImpl(String name) throws RemoteException {
    mName = name;
  }

  public String getName() throws RemoteException {
    return mName;
  }
  public float getBalance() throws RemoteException {
    return mBalance;
  }
  // Withdraw some funds
  public void withdraw(float amt) throws RemoteException {
    mBalance -= amt;
    // Make sure balance never drops below zero
    mBalance = Math.max(mBalance, 0);
  }   
  // Deposit some funds
  public void deposit(float amt) throws RemoteException {
    mBalance += amt;
  }
  // Move some funds from another (remote) account into this one
  public void transfer(float amt, Account src) throws RemoteException {
    src.withdraw(amt);
    this.deposit(amt);
  }
  // Make several transfers from other (remote) accounts into this one
  public void transfer(List amts, List srcs) throws RemoteException {
    ListIterator amtCurs = amts.listIterator();
    ListIterator srcCurs = srcs.listIterator();
    // Iterate through the accounts and the amounts to be
    // transferred from each (assumes amounts are given as Float
    // objects)
    while (amtCurs.hasNext() && srcCurs.hasNext()) {
      Float amt = (Float)amtCurs.next();
      Account src = (Account)srcCurs.next();
      // Make the transaction
      this.transfer(amt.floatValue(), src);
    }
  }
}