flights.java

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

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

import reservation.system.FlightSystem;

/**
 * This class hold Flights structure. This object allows to watch the list of the created flights by calling the command <CODE>flights</CODE> in {@link reservation.system.FlightSystem}.
 * @author Texier Mathieu and Frederic Bidon
 */
public class Flights extends Functions {
    /**
     * Display the list of the flights that are created if the command <CODE>flights</CODE> is correct.
     * @throws Exception if the command is not executed.
     * @return the names of the different flights created.
     */
    public String execute () throws Exception {
        String retString = "Flight list :\r\n";
        String[] flightList = fs.getFlightList ();
        if (flightList.length == 0)
            return "The flights' list is empty.\r\n";
        
        for (int i=0; i< flightList.length; i++) {
            retString += flightList[i] + " ";
        }
        return retString;
    }

    /**
     * Verify that at least one flight is created.
     * @throws Exception if it contains arguments or if no flight has been created. 
     */
    void _check (String[] arg) throws Exception {
        try {
        CheckFlightListNotEmpty ();
        ArgumentIsValid (arg, 0, 0);
         } catch (Exception e) {
            throw new Exception (e.getMessage ()+ "\r\n" + usage ());
        }
    }
    
    /**
    * Display the usage for the command <CODE>flights</code>.
    * @return the usage.
    */
    static public String usage () {
        String usage = " Usage command flight: flight";
        usage += " This command have to contain no argument.\n\r";
        usage += "You must create at least one flight before to use this command.";
        return usage;
    }
}