create.java

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

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

import reservation.system.Flight;

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

/**
 * This class hold Create structure. This object allows to create a new flight in the data base by calling the method <CODE>create</CODE> in {@link reservation.system.FlightSystem}.
 * @author Texier Mathieu and Frederic Bidon
 */
public class Create extends Functions {
   
    /**
     * Create a new flight in a database if the command <CODE>create</CODE> and their arguments are correct.
     * @throws Exception if the flight is not created.
     * @return a confimation's message if the flight is created.
     */
    public String execute () throws Exception {
        if (fs.create (arg[0], (short) Integer.parseInt (arg[1]), (short)
Integer.parseInt (arg[2])))
            return "Flight created \r\n";
        else {throw new Exception ("The flight is not succesfully created");}
    }

    /**
     * Verify invariants :
     * <PRE>
     * - Arguments not null
     * - <CODE>rows</CODE> belongs to [1 <CODE>Flight.ROWS_MAX</CODE>]
     * - <CODE>rowsLength</CODE> belongs to [1 <CODE>Flight.ROW_LENGTH_MAX</CODE>]
     * </PRE>
     * @throws Exception if the invariants is violated
     */
    void _check (String[] arg) throws Exception {
    	try {
        ArgumentIsValid (arg, 3, 3);
        if (!checkInteger (arg[1], 1, Flight.ROWS_MAX))
            throw new Exception ("The argument : rows has to be a number");
        if (!checkInteger (arg[2], 1, Flight.ROW_LENGTH_MAX))
            throw new Exception ("The argument : rows length has to be a number");
         } catch (Exception e) {
            throw new Exception (e.getMessage ()+ "\r\n" + usage ());
        }
    }
   
    /**
    * Display the usage for the command <CODE>create</code>.
    * @return the usage.
    */
    static public String usage () {
        String usage = " Usage command create: create <flightName> <rows> <rowLength>\n\r";
        usage += " - The <flightName> can contain all the characters except the special \r\n";
        usage += " character. \r\n";
        usage += " - The argument <rows> is a number that belongs to [1 100].\r\n";
        usage += " - The argument <rowLength> is a number that belongs to [1 10].\n";
        return usage;
    }
}