import java.awt.Color;
import javax.swing.*;
import java.awt.*;
import java.util.*;
import java.beans.*;

/** {@link PropertyChangeSupport} messages:
    <DL>
    <DT> set
    <DD> fired whenever the set this room belongs to changes.  The old and new objects
         are the old and new sets, respectively.
    <DT> north, south, east, west
    <DD> Boolean-values PCS messages that indicate the north, south, east, or west
         door has been opened, respectively.
    </DL>
*/
public class Room {

  private static int nextID = 0;
  private int id;
  private Set myset;
  private Room north, east, south, west;
  private LockPub northLock, southLock, westLock, eastLock;
  private PropertyChangeSupport pcs;

  /** Set this {@link Room}'s {@link Set} to a new {@link HashSet};  initialize PCS and the four locks ({@link LockPub}) */
  public Room() {
    this.id = nextID++;
    // complete below
  }

  /** Accessor for the id */
  public int getID() { 
     return id; 
  }

  /** Accessor for this {@link Room}'s PCS */
  public PropertyChangeSupport getPCS() { 
     return pcs; 
  }

  /** Accessor for this Room's west {@link LockInvokable} */
  public LockPub getWestLock() { return westLock; }
  /** Accessor for this Room's east {@link LockInvokable} */
  public LockPub getEastLock() { return eastLock; }
  /** Accessor for this Room's north {@link LockInvokable} */
  public LockPub getNorthLock() { return northLock; }
  /** Accessor for this Room's south {@link LockInvokable} */
  public LockPub getSouthLock() { return southLock; }

  /** Connect now to the supplied {@link Room};  fire the PCS north signal */
  public void connectNorth(Room r)  {
  }
  /** Connect now to the supplied {@link Room};  fire the PCS easth signal */
  public void connectEast(Room r)   {
  }
  /** Connect now to the supplied {@link Room};  fire the PCS south signal */
  public void connectSouth(Room r)  {
  }
  /** Connect now to the supplied {@link Room};  fire the PCS west signal */
  public void connectWest(Room r)   {
  }
  
  /** Mutator for this {@link Room}'s {@link Set} ;  notify via PCS, sending the old and new Set */
  public void setSet(Set newSet) { 
  }
  
  /** Accessor for this {@link Room}'s {@link Set} */
  public Set getSet() { return myset; }
  
  public String toString() { return "Room " + getID(); }
  
}