/** House.java -- If we can tile/carpet a room, we may also be interested
 *  in doing an entire house.  For the purpose of this program, a house
 *  is just a collection of rooms.
 *  The typical way we'll implement a "list" is by using the built-in
 *  class "ArrayList" from the Java API in the java.util package.
 *  By default, an ArrayList is a list of objects, but in this program,
 *  we know that the list will contain rooms, so we will declare our
 *  list to be of this type:  ArrayList<Room>
 *  Attributes:  ArrayList of rooms
 *  Operations:  ability to add a room to the house
 *               compute total cost to tile/carpet the house.
 */
import java.util.*;

public class House
{
  private ArrayList<Room> rooms;

  /** When someone creates a house, it will initially contain an empty
   *  list of rooms.  Later, we'll add rooms to the house one by one.
   */
  public House()
  {
    rooms = new ArrayList<Room>();
  }

  public void add(Room r)
  {
    rooms.add(r);
  }

  /** findCarpetCost - find the cost to carpet the entire house,
   * taking as a parameter the rate per square foot.
   * Simply go thru every room in the house and add up all their
   * individual costs.
   */
  public double findCarpetCost(double rate)
  {
    double totalCost = 0.00;
    for (int i = 0; i < rooms.size(); ++i)
    {
      totalCost += rooms.get(i).findCarpetCost(rate);
    }
    return totalCost;
  }

  /** findTileCost - this function is analogous to carpet.
   */
  public double findTileCost(double rate)
  {
    double totalCost = 0.00;
    for (int i = 0; i < rooms.size(); ++i)
    {
      totalCost += rooms.get(i).findTileCost(rate);
    }
    return totalCost;
  }
}