cancel.java

This project developed in java leads us to realize a flight reservation system in order to emulate d

/*
 * Cancel.java
 * The package functions contains the different class executing the different functions of the FlightSystem Reservation.
 */
package reservation.system.functions;

import java.util.HashSet;
import java.util.Set;

/**
 * This class hold Cancel structure. This object allows to cancel a reservation for different person or for a whole of person by calling the methods <CODE>cancel</CODE> in {@link reservation.system.FlightSystem}.
 * @author Texier Mathieu and Frederic Bidon
 */
public class Cancel extends Functions {
    
     /**
     * Cancel several person or a whole of person if the command <CODE>cancel</CODE> and their arguments are correct.
     * @throws Exception if a person name is duplicated or if the person are not canceled.
     * @return a confimation's message if the person(s) or the bookingNumber are canceled.
     */
    public String execute () throws Exception {
        boolean valid;
        if (arg.length > 1) {
            Set setPersonNames = new HashSet ();
            for (int i = 1; i< arg.length; i++)
                setPersonNames.add (arg[i]);
            
            if (setPersonNames.size () != arg.length-1)
                throw new Exception ("no duplicate name are allowed in reserve comande");
            valid = fs.cancel (Integer.parseInt (arg[0]), setPersonNames);
        }
        else
            valid = fs.cancel (Integer.parseInt (arg[0]));
        
        if (valid) {
            return "Flight canceled \r\n" +
            "We are Sorry, if our compagny does not fully satified you and we hope to see you soon.\r\n";
        } else {throw new Exception ("The person are not succesfully canceled");}
    }
    
     /**
     * Verify that at least one flight is created and also one reservation has been made.
     * Verify invariants :
     * <PRE>
     * - Arguments not null
     * - <CODE>bookingNumber</CODE> belongs to [1 <CODE>fs.getBookingNumberMax</CODE>]
     * </PRE>
     * @throws Exception if the invariants is violated
     */
    void _check (String[] arg) throws Exception {
        try {
        CheckFlightListNotEmpty ();
        CheckBookingListNotEmpty ();
        ArgumentIsValid (arg, 1, (short) NUMBER_ARGUMENT_MAX);
        if (!checkInteger (arg[0], 1, fs.getBookingNumberMax ()))
            throw new Exception ("The argument booking number has to be an integer");
        } catch (Exception e) {
            throw new Exception (e.getMessage ()+ "\r\n" + usage ());
        }
    }
    
    /**
    * Display the usage for the command <CODE>cancel</code>.
    * @return the usage.
    */
    static public String usage () {
        String usage = " Usage command cancel: cancel <bookingNumber> [personName1] [personName2] [...]\n\r";
        usage += " - The <bookingNumber> is a number and cannot be inferior to 0. \r\n";
        usage += " - The arguments <personNameX> which follow correspond to the name of the \n\r";
        usage += "  different persons that you want to register on the flight.\r\n";
        usage += "\t The first letter of each passenger must be in  uppercase and \n\r";
        usage += " all the other in lowercase.\n\r ";
        usage += "\t The number of name cannot be superior to the free place of the plane.\n";
        return usage;
    }
}