import java.awt.*;
import java.beans.*;
import java.util.*;
/** 
 * This is an abstract class, which means you cannot instantiate it. 
 * But it has two usful subclasses. Even though this class cannot be 
 * instantiated, you can still call methods on any Hall, as detailed below. 
**/
abstract public class Hall {
  
  private PropertyChangeSupport pcs;
  public Hall(Room r1, Room r2) {
    pcs = new PropertyChangeSupport(this);
    // add necessary code here to capture instance vars
  }

  abstract public void openDoors();

  public PropertyChangeSupport getPCS() { return pcs; }

  /** Depends on whether we are horiz or vertical hall */
  abstract public LockInvokable getLock1();
  /** Depends on whether we are horiz or vertical hall */
  abstract public LockInvokable getLock2();
  
   /** Using an anonymous, inner class, spawn a new Thread that
     * gets a {@link DoubleLock} on this hall's two rooms, and then
     * calls openDoors (overridden in subclasses */
     */
   public void doit() {
   }

  public Thread getThread() { return null; } // FIX

  public String toString() {
    return("Hall between " + getRoom1() + " and " + getRoom2());
  }
  
  /** Returns the first room specified in the constructor call. **/
  public Room getRoom1() {
    return null;  // FIX
  }
  /** Returns the second room specified in the constructor call. **/
  public Room getRoom2() {
    return null;  // FIX
  }
  
  
  
}