// ATM Simulation Implementation - Individual Sessions

ATM Simulation Implementation - Individual Sessions


/*
 * Example ATM simulation - file Session.java
 *
 * This file implements the class that represents a single customer session
 * with the ATM
 *
 * Copyright (c) 1997 - Russell C. Bjork
 *
 */

package atm;
import atm.transaction.Transaction;
import atm.util.Status;
import atm.util.Money;

//

Class Session


public class Session
  {

    //
    
    public Session(int cardNumber, ATM atm, Bank bank)
      { _cardNumber = cardNumber;
        _atm = atm;
        _bank = bank;
        _state = RUNNING;
        _PIN = 0;
        _currentTransaction = null;
      }
    
    
    //

    public void doSessionUseCase()
      {
        _PIN = _atm.getPIN();
        
        do
          {
            String anotherMenu[] = { "Yes", "No" };
            _currentTransaction = Transaction.chooseTransaction(this, _atm, _bank);
            int status = _currentTransaction.doTransactionUseCase();
            switch (status)
              {
                case Status.SUCCESS:
    
                  if (1 != _atm.getMenuChoice
                    ("Do you want to perform another transaction?",2,anotherMenu))
                      _state = FINISHED;
                  break;
                
                case Status.INVALID_PIN:
                 
                  _state = ABORTED;
                  break;
                 
               default:
                 
                 boolean doAnother = doFailedTransactionExtension(status);
                 if (! doAnother)
                   _state = FINISHED;
              }
           }
        while (_state == RUNNING);
    
        if (_state != ABORTED) 
            _atm.ejectCard();
      }


    //

    public int doInvalidPINExtension()
      { 
        int code;
        for (int i = 0; i < 3; i ++)
          { _PIN = _atm.reEnterPIN();
            code = _currentTransaction.sendToBank();     
            if (code != Status.INVALID_PIN)
                return code;
          }
        _atm.retainCard();
        _state = ABORTED;
        return Status.INVALID_PIN;
      }
    
    
    //

    public boolean doFailedTransactionExtension(int reason)
      { switch(reason)
          { 
            case Status.TOO_LITTLE_CASH:
    
                return _atm.reportTransactionFailure(
             "Sorry, there is not enough cash available to satisfy your request");
    
            case Status.ENVELOPE_DEPOSIT_TIMED_OUT:
    
                return _atm.reportTransactionFailure(
             "Envelope not deposited - transaction cancelled");
             
            default:
    
                return _atm.reportTransactionFailure(
                              _bank.rejectionExplanation(reason));
    
          } 
      }
    
    
    //
    
    public int cardNumber()
      { return _cardNumber; 
      }
    
    
    //
    
    public int PIN()
      { return _PIN; 
      }
    
    //
    
    // Possible values for _state instance variable

    private static final int RUNNING = 0;
    private static final int FINISHED = 1;
    private static final int ABORTED = 2;
    
    // Instance variables
    
    private int         _cardNumber;
    private ATM         _atm;
    private Bank        _bank;
    private int         _state;
    private int         _PIN;
    private Transaction _currentTransaction;
    
  }
  
//