Simple POJO with Control of Security

public class BankAccount {

    public void transfer(BigDecimal amount, BankAccount recipient) {

        SecurityManager.hasPermission(this, Permission.TRANSFER, SecurityContext.getCurrentUser());

        recipient.deposit(this.withdraw(amount));

    }



    public void closeOut() {

        SecurityManager.hasPermission(this, Permission.CLOSE_OUT, SecurityContext.getCurrentUser());

        this.open = false;

    }



    public void changeRates(BigDecimal newRate) {

        SecurityManager.hasPermission(this, Permission.CHANGE_RATES, SecurityContext.getCurrentUser());

        this.rate = newRate;

    }

}