/*   
 * File: AirSpace.java
 */

/**
 * This package contains the files that support the GUI
 * assignment for Semester 2 - 2000
 */

package gui2000;

import java.io.*;
import java.util.*;

/**
 * The <code>AirSpace</code> class manages a number of <code>Aircraft</code> 
 * objects in a simulated airspace.
 * It provides two communication objects:
 * <UL>
 * <LI><code>Radar</code> which provides information about the aircraft
 * in the airspace.
 * <LI><code>Radio</code> which provides two way communication with each 
 * individual aircraft.
 * </UL>
 * 
 * 
 * @author T Balls  
 * @version 0.1, 12-12-99
 *
 * @see gui2000.Radar
 * @see gui2000.Radio
 */
public class AirSpace 
{  /**
    * Create a new airspace populated with aircraft.
    * @param filename - the name of the file which is assumed to be
    * be present in the gui2000 package with which to initialise
    * the airspace.
    * <P>Check the documentation for the assignment for the full list
    * of data files that are available.
    */
 
   public AirSpace( String filename ) 
   {  FileInputStream fis = null;
      ObjectInputStream ois = null;
      try
      {  fis = new FileInputStream( filename );
         ois = new ObjectInputStream( fis );
         aircraft = (Vector)(ois.readObject());
      }
      catch( FileNotFoundException fnf )
      {  fnf.printStackTrace();
         System.out.println( "\n\n*** Error on opening file : " + filename );
         System.exit(0);
      }     
      catch( IOException ioe ) 
      {  ioe.printStackTrace();
         System.out.println( "\n\n*** Error reading file : " + filename );
         System.exit(0);
      }
      catch( ClassNotFoundException cnf ) 
      {  cnf.printStackTrace();
         System.out.println( "\n\n*** Error reading file : " + filename );
         System.exit(0);
      }
      
      radar = new Radar( aircraft );
      radio = new Radio( aircraft );
      synchronized( aircraft )
      {  for( int i = 0; i < aircraft.size(); i++ )
         {  ((Aircraft)(aircraft.elementAt(i))).addObserver( radio );
         }
      } 
      new ProximityDetector( aircraft );
   }
   
    /**@shapeType AggregationLink
    @associates <b>Aircraft</b>*/
   private Vector aircraft = null;
   private Radio radio = null;
   private Radar radar = null;
   
   public Radar getRadar()
   {  return radar;
   }
   
   public Radio getRadio()
   {  return radio;
   }
   
   /**
    *  Begin the simulation
    */
   public void startSimulation()
   {  synchronized( aircraft )
      {  for( int i = 0; i < aircraft.size(); i++ )
         {  new Thread( (Aircraft)(aircraft.elementAt(i)) ).start();
         }
 //        ((Aircraft)(aircraft.elementAt(0))).order( "RIGHT 315" );
 //        ((Aircraft)(aircraft.elementAt(0))).order( "CLIMB 5000" );
 //        ((Aircraft)(aircraft.elementAt(1))).order( "LEFT 45" );
 //        ((Aircraft)(aircraft.elementAt(1))).order( "DESCEND 2000" );
      }
      new Thread( radar ).start();
   }
   
}