World.java

import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;

public class World{
  protected Location[][] locations;
  protected Location     home;
  protected List<Player> players; // all players in the world
  
  public World(){
    locations = new Location[3][3];
    for(int r=0; r<3; r+=1){
      for(int c=0; c<3; c+=1){
        locations[r][c] = new EmptyLocation(new Position(r,c), "Nothing here to see.");
      }
    }
    home = locations[0][0];
    players = new ArrayList<Player>();
  }
  
  public List<Player> getPlayers(){ return players; }
  public Location[][] getWorld(){ return locations; } 
  public Location getHome(){ return home; }
 
  public List<Location> getLocations(){
    List<Location> list = new ArrayList<Location>(locations.length*locations[0].length);
    for (Location[] array : locations) {
        list.addAll(Arrays.asList(array));
    }
    return list;
  }
  
  /* keep a list of all players in the world. Each time a helper is created be
   * sure to add them to this list 
   */
  public World addPlayer(Player p){
    players.add(p);
    return this;
  }
  
  public boolean move(Player p, int direction){
    Location loc = p.getLocation(); // player's current location
    int x = loc.getPosition().getX();
    int y = loc.getPosition().getY();
    Location newLocation = null;
    // 
    switch(direction){
      case Directions.UP: 
        newLocation = locations[x-1][y]; 
        break;
      case Directions.DOWN: 
        newLocation = locations[x+1][y]; 
        break;
      case Directions.LEFT: 
        newLocation = locations[x][y-1]; 
        break;
      case Directions.RIGHT: 
        newLocation = locations[x][y+1]; 
        break;
      default: break;
    }
    loc.exit(p);
    newLocation.enter(p);
    
    
    return true;
  }
  
  
}